Text preview for : fuel_carb.pdf part of Solex 30-30 z2 CIT 329 Carb.
Carburettor Haynes manual for unknown car by Luka.
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4A·1
Chapter 4 Part A: Fuel and exhaust systems - carburettor models
Contents
Air cleaner element - renewal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Air cleaner - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Accelerator cable - removal and refitting . . . . . . . . . . . . . . . . . . . . . 23 Air intake heating system - operation and maintenance . . . . . . . . . . 4 Carburettors - idle speed and mixture adjustment . . . . . . . . . . . . . . 13 Carburettors - general information . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Carburettors - general maintenance . . . . . . . . . . . . . . . . . . . . . . . . . 12 Carburettors - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . . 14 Choke cable - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . . 24 Exhaust system - maintenance, removal and refitting . . . . . . . . . . . 26 Fuel level transmitter - removal and refitting . . . . . . . . . . . . . . . . . . . 9 Fuel pump - cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Fuel pump - removal, overhaul and refitting . . . . . . . . . . . . . . . . . . . 7 Fuel pump - testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Fuel tank - removal, inspection and refitting . . . . . . . . . . . . . . . . . . . 10 General information and precautions . . . . . . . . . . . . . . . . . . . . . . . . 1 Inlet and exhaust manifolds - removal and refitting . . . . . . . . . . . . . 25 In-line fuel filter (BX 16 RE) - renewal . . . . . . . . . . . . . . . . . . . . . . . . 8 Solex carburettor 34 PBISA 17 - adjustment . . . . . . . . . . . . . . . . . . 16 Solex carburettors 32-34 Z1 and 34-34 Z1 - adjustment . . . . . . . . . 19 Solex carburettors 30-30 Z2 CIT 329 and 32-34 Z2 CIT 348 adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Solex carburettors 32-34 Z1 CIT 319, W 319 and 34-34 Z1 381 adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Solex carburettors - overhaul . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Weber carburettors - adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Weber carburettors - overhaul . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Weber carburettor 36 TLP - overhaul and adjustment . . . . . . . . . . . 22
Degrees of difficulty
Easy, suitable for novice with little experience
4A
1
Fairly easy, suitable for beginner with some experience
2
Fairly difficult, suitable for competent DIY mechanic
3
Difficult, suitable for experienced DIY mechanic
4
Very difficult, suitable for expert DIY or professional
5
Specifications
For engine to model applications refer to Chapter 2
Air cleaner
Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Element: BX 14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . BX 14 (Aug 1988 to Sept 1991) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . BX 14 (Sept 1991 on) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . BX 16 (pre June 1987) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . BX 16 (Sept 1988 to 1991) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . BX 19 (pre June 1987) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . BX 19 (from July 1987) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . BX 19 (1991 on) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Dry type with replaceable cartridge. Manual or automatic air temperature controlled inlet system Champion V402 Champion V401 Champion V438 Champion W117 Champion U543 Champion W117 Champion U543 Champion U543
Fuel filter
Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Champion L101
Fuel pump
Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Mechanical diaphragm, driven by eccentric on camshaft
4A·2 Fuel and exhaust systems - carburettor models
Carburettor - BX
Engine application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Carburettor type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Venturi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Main jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Air corrector jet and emulsion tube . . . . . . . . . . . . . . . . . . . . . . . . . . . . Idle jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bypass jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pneumatic enrichment device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pump injector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Econostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Needle valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Float level setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Primary choke valve opening (strangler valve fully shut) . . . . . . . . . . . . Strangler flap opening (by anti-flood capsule) under vacuum of 350 mbar . . Idle speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CO percentage in exhaust gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150 A Solex 30-30 z2 CIT 329 Primary 24 112.5 165 ZD 40 50 35 1.6 mm 33 ± 1 mm 0.9 mm 3.2 ± 0.5 mm 700 to 800 rpm 0.8 to 1.15 150 C Solex 32-34 Z2 CIT 348 Primary 24 115 155 ZE 40 45 35 1.6 mm 33 ± 1 mm 0.75 mm 3.7 ± 0.5 mm 800 to 850 rpm 0.8 to 1.5 K1G Solex 34 PBISA 17 26 132 155 EC 42 to 46 55 40 1.6 mm 750 ± 50 rpm 0.8 to 1.2 171 Weber 32-34 DRTC 100 W 121-50 Primary 24 107 165 F27 45 55 175 0.50 mm 4.5 mm 7.25 ± 0.25 mm 700 rpm 0.8 to 1.5 Secondary 25 125 180 ZC 50 80
Carburettor - BX 14 (pre August 1988)
Engine application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Carburettor type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Venturi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Main jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Air corrector jet and emulsion tube . . . . . . . . . . . . . . . . . . . . . . . . . . . . Idle jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bypass jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pneumatic enrichment device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pump injector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Econostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Needle valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Float level setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Primary choke valve opening (strangler valve fully shut) . . . . . . . . . . . . Strangler flap opening (by anti-flood capsule) under vacuum of 350 mbar . . Idle speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CO percentage in exhaust gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Secondary 25 120 160 ZC 50 35 80
Carburettor - BX 14 (from August 1988)
Engine application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Carburettor type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Venturi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Main jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Air correction jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Emulsion tube . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Idle jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Enrichment jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Accelerator pump jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Float chamber needle valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Idle speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CO percentage in exhaust gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Carburettor - BX 16 (pre June 1983)
Engine application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Carburettor type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Venturi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Main jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Air corrector jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Emulsion tube . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Idle jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bypass jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pump injector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Econostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Needle valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Primary choke valve opening at 20ºC . . . . . . . . . . . . . . . . . . . . . . . . . . Strangler flap opening (by anti-flood capsule) . . . . . . . . . . . . . . . . . . . . Float level setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Idle speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C0 percentage in exhaust gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Secondary 26 115 160 F27 70 60
Fuel and exhaust systems - carburettor models 4A·3
Carburettor - BX 16 (pre June 1983)
Engine application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Carburettor type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Venturi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Main jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Air corrector jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Emulsion tube . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Idle jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Accelerator pump injector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Needle valve diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Float setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Primary choke valve opening (strangler flap fully shut) . . . . . . . . . . . . . Strangler flap opening (by anti-flood capsule) . . . . . . . . . . . . . . . . . . . . Idle speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CO percentage in exhaust gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171 Solex 32-34 Z1 CIT 319 Primary 24 140 200 23 42 40 1.8 mm 33.0 mm 0.45 mm 6.0 mm 650 to 700 rpm 1 to 2 171 Weber 32-34 DRTC 2/100 W 128-50 Primary 24 107 170 F27 45 50 1.75 6.75 ± 0.25 mm 1.0 mm 0.45 mm 4.5 mm 650 to 700 rpm 0.8 to 1.5 171 Solex 32-34 Z1 W 319 Primary 24 140 200 23 42 40 55 1.8 mm 0.45 mm 6.0 mm 650 to 700 rpm 0.8 to 1.5 Secondary 26 120 155 18 70 35
Carburettor - BX 16 (from July 1983)
Engine application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Carburettor type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Venturi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Main jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Air corrector jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Emulsion tube . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Idle jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bypass jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pump injector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Econostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Needle valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Float setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Maximum difference between floats . . . . . . . . . . . . . . . . . . . . . . . . . . . Primary choke valve opening (strangler flap fully shut) at 20ºC . . . . . . . Strangler flap opening (by anti-flood capsule) . . . . . . . . . . . . . . . . . . . . Idle speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CO percentage in exhaust gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Secondary 26 112 160 F27 50 60
Carburettor - BX 16 (from July 1983)
Engine application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Carburettor type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Venturi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Main jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Air corrector jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Emulsion tube . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Idle jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bypass jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pump injector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Enrichment device jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Econostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Needle valve diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Primary choke valve opening (1st choke at 20ºC) . . . . . . . . . . . . . . . . . Strangler flap opening (by anti-flood capsule) under vacuum . . . . . . . . Idle speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CO percentage in exhaust gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Secondary 26 120 155 18 70 35 80
4A
Carburettor - BX 16 (from March 1984)
Engine application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171 Carburettor type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Solex 32-34 Z1 CIT 319-1 This carburettor differs from the Solex 32-34 Z1 CIT 319 carburettor in the following ways: Primary Idling air correction jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180 Enrichment device jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Secondary 150 -
Carburettor - BX 16 (automatic transmission)
Engine application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171 Carburettor type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Weber 32-34 DRTC 4 100 W 130-50 This carburettor is the same as the Weber 32-34 DRTC 2/100 W 128-50 with the following exception: CO percentage in exhaust gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 to 2
4A·4 Fuel and exhaust systems - carburettor models
Carburettor - BX 16 (automatic transmission and air conditioning)
Engine application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171 Carburettor type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Weber 32-34 DRTC 8/100 W 136-50 This carburettor is the same as the Weber 32-34 DRTC 4 100 W 130-50 with the following exception: Idle speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 750 to 800 rpm
Carburettor - BX 16 RE
Engine application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Carburettor type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Venturi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Main jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Air correction jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Emulsion tube . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Idle jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Enrichment jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Accelerator pump injector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Float chamber needle valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Idle speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CO percentage in exhaust gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B1A/A Weber 36 TLP 1/100 28 142 150 F80 47 to 51 50 50 1.5 mm 700 ± 50 rpm 1 to 2
Carburettor - BX 16 (from Sept 1988 to 1991)
Engine application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Carburettor type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Venturi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Main jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Air correction jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Emulsion tube . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Idling jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Air correction jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Enrichment jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Econostat jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Accelerator pump jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fuel inlet needle valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Idle speed: Manual gearbox . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Automatic transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CO percentage in exhaust gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B2C Solex 32-34 Z1 PSA Primary 24 112.5 145 ZD 44 180 55 40 1.8 800 ± 100 rpm 750 ± 50 rpm 0.8 to 1.5 Secondary 26 125 140 ZC 50 150 80 40
Carburettor - BX 19
Engine application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Carburettor type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Venturi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Main jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Air corrector jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Emulsion tube . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Idle jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Idle air correction jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Enrichment device jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Econostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pump injector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Needle valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Float adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Primary choke valve opening (strangler flap fully shut) at 20ºC . . . . . . . Strangler flap opening (by anti-flood capsule) . . . . . . . . . . . . . . . . . . . . Manual de-flooding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Idle speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CO percentage in exhaust gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159 Solex CISAC 34-34 Z1 381 Primary 25 115 150 18 43 145 50 40 1.8 mm 33 mm 0.45 mm 5 to 7 mm 7 to 9 mm 650 to 750 rpm 1.5 ± 0.5 Secondary 17 125 160 20 90 145 80 35
Carburettor - BX 19 TRS/TZS (from July 1986 to 1991)
Engine applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Carburettor types: Manual gearbox . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Manual gearbox with air conditioning . . . . . . . . . . . . . . . . . . . . . . . . . Automatic transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Automatic transmission with air conditioning . . . . . . . . . . . . . . . . . . . D2A and D2E Solex 34-34 Z1 CIT 391 Solex 34-34 Z1 CIT 291-1 Weber 34-34 DRTC 14/100 Weber 34-34 DRTC 15/100
Fuel and exhaust systems - carburettor models 4A·5
Carburettor - BX 19 TRS/TZS (from July 1986 to 1991) (continued)
Solex carburettors Venturi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Main jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Air correction jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Emulsion tube . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Idling jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Idling air correction jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Enrichment device jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Econostat calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pump injector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Needle valve diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Float adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Positive opening of primary valve (at 20ºC) . . . . . . . . . . . . . . . . . . . . Strangler flap opening by anti-flood capsule. . . . . . . . . . . . . . . . . . . . Manual anti-flooding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Idle speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fast idling (air conditioning) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CO percentage in exhaust gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Weber carburettors Venturi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Main jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Air correction jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Emulsion tube . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Idling jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Idling air correction jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Enrichment device jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Econostat calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pump injector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Float adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Positive opening of primary valve (at 20ºC) . . . . . . . . . . . . . . . . . . . . Strangler flap opening by anti-flood capsule . . . . . . . . . . . . . . . . . . . Manual anti-flooding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Idle speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fast idling (air conditioning) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CO percentage in exhaust gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Primary 25 115 150 ZD 43 145 50 40 1.8 mm 33 mm 0.45 mm 5 to 7 mm 7 to 9 mm 700 ± 50 rpm 900 ± 50 rpm 1.0 to 2.0 Primary 25 110 160 F45 52 150 55 50 7 mm 0 ± 1 mm 4.5 ± 1 mm 8.5 mm 800 ± 50 rpm 900 ± 50 rpm 1.0 to 2.0 Secondary 27 115 160 ZC 90 145 70 56
Secondary 27 125 150 F27 50 70 85
4A
Carburettor - BX 19 TZS (from 1991)
Engine application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Carburettor type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Venturi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Main jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Air correction jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Emulsion tube . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Idling jet: Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Automatic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Idling air correction jet: Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Automatic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Enrichment jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Econostat jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Accelerator pump jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fuel inlet needle valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Idle speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CO percentage in exhaust gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D2F Solex 34-34 Z1 Primary 26 115 ± 5 140 ± 20 3Z 45 ± 5 44 ± 3 145 ± 20 145 ± 20 50 ± 20 45 1.8 mm 750 ± 50 rpm 0.8 to 1.2 Nm 15 22 22 Secondary 27 122 ± 5 160 ± 20 ZC 110 ± 10 110 ± 10 145 ± 20 140 ± 20 50 ± 20 40
Torque wrench settings
Carburettor to inlet manifold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Inlet manifold to cylinder head . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Exhaust manifold to cylinder head . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
lbf ft 11 16 16
4A·6 Fuel and exhaust systems - carburettor models
1 General information and precautions General information
The fuel system is conventional in layout and operation. The fuel tank is mounted on the underside of the vehicle directly beneath the rear passenger seats. Fuel is drawn from the tank by a mechanical diaphragm pump operated by an eccentric on the camshaft and fed via a fuel filter (some models) to a carburettor of Solex or Weber manufacture. Depending on model type, a manually operated or automatic choke is fitted. The air cleaner is of the renewable element type. On BX and BX14 models, the temperature of the air entering the air cleaner unit has a manual control for seasonal setting. Other models in the range have an automatic temperature control fitted to the air cleaner. All models are fitted with a basic emission control system which relies mainly on the correct setting of the carburettor and the ignition system to keep exhaust emission levels to a minimum. The admission of warm air to the air cleaner on all models keeps the intake air at the carburettor at a constant temperature and this too makes for clean combustion. The engine crankcase ventilation system transfers oil fumes and blow-by gases which get past the piston rings into the air cleaner where they are consumed during the normal combustion process.
3.2a Air intake disconnected from air cleaner casing
3.2b Removing insulated hose from exhaust manifold hot air collector plate
Tamperproof adjustment screws
Certain adjustment points in the fuel system are protected by "tamperproof" caps, plugs or seals. The purpose of such tamperproofing is to discourage, and to detect, adjustment by unqualified operators. In some EEC countries (though not yet in the UK), it is an offence to drive a vehicle with missing or broken tamperproof seals. Before disturbing a seal, satisfy yourself that you will not be breaking local or national anti-pollution regulations by doing so. Fit a new seal when adjustment is complete, when this is required by law. Do not break tamperproof seals on a vehicle which is still under warranty.
2 Air cleaner element - renewal
1 2
Refer to Chapter 1, Section 28.
3 Air cleaner - removal and refitting
BX 14 - K1G engine
1 Remove the air cleaner element. 2 Release the large clip, then separate and remove the air intake from the air cleaner casing. Note the insulated hose connecting with the exhaust manifold hot air collector plate (see illustrations). 3 Disconnect the air intake duct from the carburettor and the crankcase vent hoses, then withdraw the air cleaner casing upwards. Note the locating spigot at the base of the casing (see illustrations). 4 Refitting is a reversal of removal. On completion, set the Winter/Summer lever to the appropriate position (see illustration).
Unleaded petrol - usage
As a general rule, all pre-1988 carburettor models are not suitable for running on unleaded petrol, and must be run on 97 RON leaded fuel only. Models manufactured between 1988 and 1991 should also only be run an 97 RON leaded fuel, but most models produced between these dates are suitable for running on 95 RON unleaded fuel if the suitable adjustments are first carried out. For full information on the use of unleaded petrol, consult your Citroën dealer who will be able to inform you if your vehicle is capable of running on unleaded fuel and, where possible, of the necessary adjustments required. The use of unleaded fuel in a vehicle not designed, or suitably adjusted, to run on unleaded fuel will lead to serious damage of the valve seats.
Precautions
Fuel warning
Many of the procedures in this Chapter require the removal of fuel lines and connections which may result in some fuel spillage. Before carrying out any operation on the fuel system refer to the precautions given in Safety first! at the beginning of this Manual and follow them implicitly. Petrol is a highly dangerous and volatile liquid and the precautions necessary when handling it cannot be overstressed.
All other models
5 Detach the hoses/air ducts to the cleaner unit. 6 On BX and BX 14 models, unclip the retaining strap.
3.3a Disconnecting crankcase vent hose from air cleaner
3.3b Removing air intake duct from carburettor and air cleaner
3.3c Air cleaner casing A Base locating spigot B Spigot grommet
Fuel and exhaust systems - carburettor models 4A·7
3.4 Air cleaner Winter/Summer lever 7 Undo the retaining bolt(s) and remove the unit. 8 Refit in the reverse order to removal.
4.2 Manual air intake control 1 ETE (summer) setting 2 Mixte (Mixture) setting 3 Hiver (Winter) setting
5 Fuel pump - testing 4 Air intake heating system operation and maintenance
1
2
4.3 Automatic air intake control 4 5 A B C Air control flap Temperature sensor Air supply to filter Ambient air intake Heater air intake
Operation
1 To maintain engine performance in cold conditions, warm air is admitted to the air intake before entering the air cleaner. Air is preheated by a muff on the exhaust manifold and its intake is controlled manually by means of a lever on the top face of the intake ducting (BX and BX 14 models) or automatically by an integral thermostat (BX 16 and 19 models). 2 The manual adjustment lever has three adjustment positions (see illustration). 3 On automatic control models, the integral thermostat operates a valve which directs warm air from the exhaust manifold ducting or cool air through the normal air intake duct on the air cleaner unit (see illustration).
1 If the performance of the fuel pump is in doubt, first examine for fuel leaks and check that the fuel line connections are all sound. 2 Disconnect the fuel hose at the carburettor inlet connection and disconnect the high tension lead from the coil. Ensure that the tank contains fuel. 3 Direct the fuel feed hose into a suitable container and have an assistant operate the starter to crank the engine. A good spurt of fuel should be delivered on every second revolution of the engine. If not, check that the hose is not blocked. If the hose is clear, then the pump will have to be removed for examination or renewal.
2 With the cover removed, take out the filter screen and wash it in fuel until it is free from fluff and dirt (see illustration). 3 Mop out the fuel from the pump body and wipe out any sediment. 4 Refit the filter screen and cover, making sure that the gasket is in good condition.
7 Fuel pump - removal, overhaul and refitting
3
4A
6 Fuel pump - cleaning
Maintenance
4 This system calls for no special maintenance but, on manual control models, the adjustment lever must be set to the appropriate position as the season demands. Failure to make the seasonal adjustment will reduce efficiency, may cause the carburettor to ice up, and will certainly create emulsion in the engine breather pipes and rocker cover in very cold weather.
2
Note: Have a repair kit available before dismantling the fuel pump
Removal
1 The fuel pump may be one of several types and inspection will determine which type of pump is fitted. On one type, the filter cover is simply unbolted and removed. On the other type, the pump cover is retained by two screws. With some pumps, the fuel outlet hose must be removed in order to be able to withdraw the pump cover (see illustrations). 1 Disconnect the fuel lines from the pump and plug them to prevent ingress of contamination (see illustration). 2 Note that on BX 16 and BX 19 models manufactured after November 1985, the fuel lines have reduced inside diameter connections and are now 6 mm in diameter instead of 8 mm as on earlier models. All
6.1a Fuel pump cover removal - nonremovable filter type
6.1b Fuel pump cover removal removable filter type
6.2 Fuel pump filter removal
4A·8 Fuel and exhaust systems - carburettor models
7.1 Fuel supply hose removal from fuel pump connections to the pump, carburettor, fuel filter and fuel flow meter are now of the same diameter. Early and later-type connections are not directly interchangeable. Note also that the later-type fuel lines are secured with clips. 3 Unscrew the pump mounting bolts/nuts and lift the pump away (see illustrations). 4 An insulator block with a gasket each side is fitted between the pump flange and the mounting flange on the engine. The gaskets must be renewed when refitting the pump. 5 Where applicable, withdraw the pump operating pushrod (see illustration).
7.3a Fuel pump showing retaining nuts and black insulator block - BX 16
7.3b Fuel pump removal - BX 14
Refitting
9 Before refitting the pump, check that the operating pushrod is in position (where applicable). Locate a new gasket each side of the insulator and refit the pump. 10 Tighten the securing bolts and make sure that the fuel hoses are reconnected to their correct pump connections.
8 In-line fuel filter (BX 16 RE) renewal
Overhaul
6 Further dismantling may not be possible on some types of pump. Even if it is, it should only be attempted if you have a repair kit. First, mark the top and bottom halves of the pump for reassembly and then progressively loosen and remove the screws holding the two halves together. The diaphragm is connected to the operating mechanism beneath, and details will vary with different pumps. Note the sequence of assembly so that reassembly can be achieved in the same order. 7 Renew all defective parts. The repair kit will contain a variety of seals or gaskets which should automatically be fitted in place of the originals, regardless of the fact that they may appear fit for further use. 8 Reassembly is the reverse of the dismantling sequence. Make sure that the upper and lower halves of the pump body are aligned and tighten the joint screws progressively and diagonally. Do not overtighten the top cover screws.
2
7.5 Fuel pump pushrod - BX 14
1 From November 1987, BX 16 RE models have an in-line fuel filter fitted between the fuel pump and the carburettor. 2 When renewing this filter, ensure that the directional arrow on the filter points towards the carburettor and check for leaks at its hose connections after starting the engine (see Chapter 1). 3 Note that on BX 16 and BX 19 models manufactured after November 1985, the fuel lines have reduced inside diameter connections and are now 6 mm in diameter instead of 8 mm as on earlier models. All connections to the filter, carburettor, fuel pump and fuel flow meter are now of the same diameter. Early and later-type connections are not directly interchangeable. Note also that the later-type fuel lines are secured with clips.
Refitting
5 Refitting is a reversal of removal. Use a new sealing ring if there is any doubt about the condition of the original one.
10 Fuel tank - removal, inspection and refitting
3
Removal
1 The fuel tank will normally only need to be removed if it is severely contaminated or damaged, or for any repair work to the adjacent body structure or mechanical components. 2 As there is no drain plug incorporated in the tank, the best time to remove it is when it is nearly empty. If this is not possible, syphon as much as fuel as possible from the tank into a container which can be sealed. Before doing so, observe the following precautions: a) Disconnect the battery b) Do not smoke or allow any naked lights near the working area c) Avoid placing the vehicle over an inspection pit as fuel vapour is heavier than air 3 Raise the rear of the vehicle and support it on axle stands (see "Jacking and vehicle support"). 4 From within the vehicle, disconnect the wiring from the fuel level transmitter. 5 Disconnect the fuel supply and return pipes from the fuel tank top face. Note that the fuel
9 Fuel level transmitter removal and refitting
2
Removal
1 Disconnect the battery earth lead. 2 Fold the rear seat forwards and remove the insulator mat. 3 Prise free the circular plastic cover to expose the fuel level transmitter and disconnect the wiring from it (see illustration). 4 Using a suitable tool, unscrew the transmitter mounting plate to release it from the securing tabs. Withdraw the transmitter unit.
9.3 Fuel level transmitter
Fuel and exhaust systems - carburettor models 4A·9
10.5 Fuel tank and associated components 1 2 3 4 5 6 Return hose Suction pipe filter Suction pipe (identified by yellow paint mark) Vent unit with one-way valve Filler pipe Tank vent pipe
A Fuel level transmitter - note correct fitting orientation B Fuel supply/return hose unit - note correct fitting orientation
4A
supply pipe is marked with yellow paint for identification. Plug the pipes to prevent fuel leakage and the ingress of dirt (see illustration). 6 Remove the exhaust system. 7 Detach the height control linkage, complete with its intermediate bearing (see illustration). 8 Detach the fuel filler pipe from the tank inlet nozzle. 9 Unfasten and peel back the carpet edging from the floor panel above the leading edge of the tank, then unscrew the two front tank retaining screws. Support the weight of the tank from underneath. 10 Unscrew and remove the three retaining bolts along the rear edge of the tank unit (from above), then lower the tank. As it is lowered, disconnect the ventilation pipe from the side of the tank. On BX and BX 14 models, this pipe is connected to the right-hand side, whilst on BX 16 and 19 models, the pipe connection is on the left-hand side.
12 If the tank contains sediment, remove the fuel level transmitter and wash out the tank using paraffin, then rinse it out with clean fuel whilst observing all precautions against fire.
Ensure that all hose connections are securely made.
Refitting
13 Refit in the reverse order of removal.
11 Carburettors - general information
1 The carburettor fitted is a single Solex or Weber of twin or single choke downdraught design. 2 The type of carburettor fitted is dependent on engine type. Refer to the Specifications for application details. Depending on vehicle type, a manually operated or automatic choke is fitted. 3 All carburettors are conventional in operation and have a primary and main jet system and a mechanically operated acceleration pump. All carburettors incorporate exhaust emission control anti-pollution. 4 The type identification number is stamped on a plate attached to the carburettor. 5 The Weber carburettor fitted to BX 16 models with automatic transmission is identical in design to other Weber carburettor types fitted to manual gearbox models, except that it also has a kickdown cam fitted.
Inspection
11 If the tank is damaged, remove the fuel level transmitter unit and renew the tank. It cannot be repaired. 10.7 Height control linkage (1) and intermediate bearing (2)
4A·10 Fuel and exhaust systems - carburettor models
5 After removing the jets, clean them by first washing in clean fuel and then blowing air through them. Never use a piece of wire as jet calibration can be easily altered. 6 The float can be removed after taking out the hinge pin. The float needle valve can then be unscrewed and washed in fuel. Clean any dirt out of the float chamber using clean fuel but do not use rag for drying. 7 The fuel inlet filter gauze and the accelerator pump valve gauze should both be washed in clean fuel and dried in air. Do not use rag to dry them. On refitting the float, check and if necessary adjust, the level setting. 8 On completion check the idle speed. and the ignition system must be in good condition and adjusted correctly. 3 An independent tachometer is necessary to make accurate adjustment and it should be connected to the engine in accordance with the manufacturer's instructions.
12 Carburettors - general maintenance
3
Note: A complete carburettor strip-down is unlikely to cure a fault which is not immediately obvious without introducing new problems. If persistent carburation problems are encountered, it is recommended that the advice of a Citroen dealer or carburettor specialist is sought. 1 Before blaming the carburettor for any shortcomings in engine performance, remember that there is no reason why the carburettor should lose tune. What usually happens is that, as the engine gets older and less efficient, more or less fruitless attempts may be made to restore performance by interfering with the carburettor. In countries where exhaust emission is regulated by law, it is inadvisable and may be illegal, to alter carburettor settings without monitoring exhaust emission levels using special equipment. 2 The ultimate cause of most carburettor problems is wear in moving parts or dirt in the jets. The Solex and the Weber carburettors have no continuously moving parts (except for the float and the throttle spindle) which makes it a very reliable device so long as dirt does not get in. A drop of oil on the various linkages and flap spindle will ensure that they last for years without trouble. In consequence, carburettor overhaul should be no more frequent than major engine overhaul. 3 Routine carburettor maintenance consists only of periodic cleaning of the float chamber and jets and (where applicable) an occasional look at the small gauze filters fitted in the fuel inlet connection and on the accelerator pump inlet valve. These tasks can be undertaken with the carburettor fitted to the engine. 4 Before separating the top of the carburettor from the bottom, give the outside a good clean using paraffin or a proprietary cleaner and a stiff brush, afterwards drying with clean rag. It is well worth taking this extra trouble to reduce the risk of dirt getting into the carburettor.
Idle speed adjustment
4 Refer to Chapter 1, Section 23.
Mixture adjustment
5 Where adjustment is to be made to the mixture control screw, it may first be necessary to prise free the tamperproof cap for access (see illustrations). 6 With the air filter fitted, run the engine until warm, as indicated by the engagement of the cooling fan. When the cooling fan cuts out, adjustments can be made. During prolonged adjustments take care as the cooling fan will cut-in again periodically. 7 Turn the mixture screw to the position which provides the highest engine speed. Now reduce the engine speed to approximately 50 rpm above the specified idle speed for your model. 8 Repeat the procedure outlined in paragraph 10, then screw in the mixture control screw to reduce the engine speed by 30 to 50 rpm. Further minor adjustment to the idle speed may be necessary to bring the engine speed to within the idle speed range specified. 9 Whenever the mixture control screw setting has been reset, it is advisable to have an exhaust CO reading taken by your Citroën dealer to ensure that the CO reading at the exhaust is within the specified limits. This is of particular importance in territories where strict emission controls are enforced.
13 Carburettors - idle speed and mixture adjustment
3
Note: Before carrying out any carburettor adjustments, ensure that the ignition timing, valve clearances and spark plug gaps are correctly set Note: After resetting the mixture, have an exhaust CO reading taken by your Citroën dealer to ensure that it is within the specified limits Note: Information for adjustment of the Solex carburettor 34 PBISA 17 is contained in Section 16 1 Generally speaking, unless the carburettor is obviously out of tune or is malfunctioning, it is not advisable to tamper with it. In any case, the only running adjustment that can be made is to the idling. 2 Correct adjustment can only be achieved provided that the engine is in generally good condition. Valve clearances must be correct
13.5a Solex 32-34 - mixture adjustment screw location (6)
13.5b Weber carburettor - mixture adjustment screw (arrowed)
Fuel and exhaust systems - carburettor models 4A·11
14.3 Weber carburettor - idle cut-off (14), spacer flange (15) and screws (16)
14.4a Weber carburettor removal - items to be disconnected a and b Coolant hoses to automatic choke 9 Air filter duct 10 Fuel inlet pipe 11 Fuel return pipe 12 and 13 Coolant hose retaining clips
14 Carburettors - removal and refitting
3
Removal
1 Disconnect the battery earth lead. 2 Unclip and detach the air ducting between the carburettor and the air cleaner unit. Where a Solex 34 PBISA 17 carburettor is fitted, the air cleaner must be removed.
14.4b Solex 32-34 - fuel supply and return hoses
3 Disconnect the wire from the idle cut-off solenoid (see illustration). 4 Disconnect the fuel supply and return lines from the carburettor (see illustrations). Plug the hoses to prevent the ingress of contamination. 5 Note that on BX 16 and BX 19 models manufactured after November 1985, the fuel lines have reduced inside diameter connections and are now 6 mm in diameter instead of 8 mm as on earlier models. All connections to the carburettor, fuel pump, fuel filter and fuel flow meter are now of the same diameter. Early and later-type connections are not directly interchangeable. The only exception to this is if a later-type Solex carburettor is fitted. In this instance, it will be necessary to renew the fuel feed connection to suit. Note also that the later-type fuel lines are secured with clips. 6 Detach the accelerator inner cable from the quadrant and the outer cable from its support at the carburettor and fold it back out of the way. 7 On manual choke models, detach the choke cable by loosening the inner cable clamp screw. Unscrew the outer cable location clamp bolt and move the cable out of the way.
8 On automatic choke models, clamp the coolant hoses each side of the choke unit, then loosen the securing clips and detach the hoses from the choke unit (see illustration). If the hoses are not clamped, the cooling system will have to be partially drained to prevent coolant loss when the hoses are detached. 9 On BX 16 models fitted with the Solex 32-34 Z1 CIT 319-1 carburettor, disconnect the ventilation hoses from the float chamber. Note that the upper hose is connected to the air filter at the other end (see illustration). 10 Where applicable, disconnect the vacuum hose from the carburettor (see illustration). 11 Unscrew and remove the space flange retaining screw and pull the flange away from the carburettor body. 12 Unscrew and remove the four nuts securing the carburettor to the inlet manifold, then lift the carburettor away from it for removal. Retrieve the old joint gasket and place a piece of clean cloth over the aperture in the manifold to prevent the ingress of contamination while the carburettor is removed.
4A
14.8 Solex 32-34 - coolant hose connections
14.9 Solex 32-34 - ventilation hose connections
14.10 Solex 32-34 - vacuum hose connection (1) and spacer flange connection (2)
4A·12 Fuel and exhaust systems - carburettor models
Refitting
13 Refitting the carburettor is the reverse of the removal procedure. Remove all traces of the old gasket and use a new one on installation. 14 After fitting the carburettor, reconnect the accelerator cable and (where applicable) the choke cable. When the choke control cable is fitted and the choke knob is pushed fully in, the flap should be fully open and there should be a small amount of possible additional movement on the control knob. Check that the flap closes when the control is pulled. 15 After reconnecting the two coolant hoses, remove any clamps used. 16 Top up the cooling system. 17 Adjust the idle speed on completion. carburettor parts are fitted in their exact original position, even though they may appear to be interchangeable. To help in this procedure, label items, put small parts in containers so that they do not become mixed up, and lay parts out in order of assembly on clean paper. 5 Identify the relevant illustration for the carburettor being dismantled (see illustrations). 6 Undo the retaining screws and the choke link connecting screw, seen behind the arm of the spring (see illustration) and lift the carburettor top cover away from the main body (see illustration) 7 The float can be removed by pushing out the hinge pin and then the needle valve assembly can be unscrewed from the cover. Unscrew the fuel inlet connection and remove the gauze filter. Examine the filter for contamination. 8 Remove the accelerator pump operating rod and then remove the cover by progressively undoing the four retaining screws whilst restraining it against the action of the spring under the diaphragm. Examine the diaphragm for splits or damage. 9 Remove the accelerator pump inlet valve cover located in the bottom of the float chamber, taking care not to lose the ball valve. Examine the filter for contamination. 10 Unscrew and remove the jets, checking them for dirt or blockage. 11 It should not be necessary to interfere with any adjusting screws but, if this is necessary, count the number of turns required to remove the screw so that it can be refitted in approximately the same position. 12 Do not disturb the choke flap and throttle butterfly valve or spindles. Their actuating mechanisms are external and normally require no attention unless excessively worn. If the spindles are worn in the carburettor body then serious consideration should be given to renewing the complete carburettor. Air leaks around a worn spindle makes it impossible to tune the carburettor correctly and poor performance and impaired economy will inevitably result. 13 The respective chambers, passages and jet seats can be brush cleaned using clean fuel and then blown dry. Do not use cloth. Clean and blow through the jets in a similar manner. 14 Reassembly is the reverse of the dismantling procedure. Use new washers, gaskets, or seals, wherever fitted. During reassembly, check and adjust the float level. 15 On refitting the carburettor, check the idle speed setting and adjust as necessary. Further "on vehicle" carburettor adjustments may be necessary, check with the appropriate carburettor Section.
15 Solex carburettors - overhaul
3
1 The carburettor should not normally need to be dismantled except for cleaning and checking the float level. 2 The carburettor is a relatively delicate instrument and requires careful handling. Use the correct tools for the job and do not interchange jets or clean them out with wire which will cause damage and interfere with calibration. 3 Before dismantling, clean the outside of the carburettor and prepare a clean work area. 4 It is sound policy to ensure that individual
15.5a Sectional view of Solex carburettor - BX and BX 14 1 2 3 4 5 6 7 8 Fuel inlet Fuel return Needle valve Float level adjusting tab Float Progression fuel jet Progression air jet Main jet 9 10 11 12 Air correction jets Idle jet Idle air calibration Idle mixture adjustment screw 13 Idle speed adjustment screw 14 Accelerator pump cam 15 16 17 18 19 21 A B Accelerator pump Accelerator pump injectors Power enrichener Enrichener calibration Enrichener valve Econostat Primary barrel Secondary barrel
Fuel and exhaust systems - carburettor models 4A·13
15.5b Solex 32-34 carburettor with automatic choke - BX 16 a Air corrector jets Cbp Bypass jet Ce Enrichment device jet CE Econostat fuel jet g Idle jet Gg Main jet F Float i Pump injector K Venturi P Needle valve
1st body
2nd body
4A
2nd body 1st body 1st body 2nd body
15.5c Solex 30-30 and 32-34 Z 2 - top view with cover removed 1 Main jet (primary) 2 Secondary venturi 3 Main jet/air corrector jet/emulsion tube (secondary) 4 Primary venturi 5 Pump injector
15.5d Solex 32-34 and 34-34 Z 2 - top view with cover removed 1 Main jet 2 Primary venturi 3 Pump injector 4 Main jet/air corrector jet/emulsion tube (primary) 5 Secondary venturi
4A·14 Fuel and exhaust systems - carburettor models
15.6a Solex 32-34 Z1 W 319 - choke control unit shown with cover removed. Choke link screw (arrowed)
15.6b Solex carburettor - top cover screws (arrowed) 9 Turn the mixture adjustment screw to obtain the specified CO reading. 10 Repeat the procedure given in paragraphs 8 and 9 until the idle speed is 750 ± 50 rpm.
16 Solex carburettor 34 PBISA 17 - adjustment
3
1 The following adjustments must be made with the ignition timing correctly adjusted, the air cleaner fitted and the engine at normal operating temperature. 2 Connect a tachometer to the engine. 3 Where necessary, remove the tamperproof cap from the mixture adjustment screw.
17 Solex carburettors 30-30 Z2 CIT 329 and 32-34 Z2 CIT 348 - adjustment Float level setting
3
Without exhaust gas analyser
4 Turn the throttle stop screw to adjust the engine speed to 750 ± 50 rpm (see illustration). 5 Turn the mixture adjustment screw to obtain the highest idling speed (see illustration). 6 Repeat the procedure given in paragraphs 4 and 5 until the engine speed is 750 ± 50 rpm (i.e. after adjusting the mixture screw). 7 Screw in the mixture adjustment screw slightly until the engine speed starts to decrease.
16.4 Solex 34 PBISA throttle stop screw (1)
With exhaust gas analyser
8 Turn the throttle stop screw to adjust the engine speed to 750 ± 50 rpm.
1 This check can be made with the carburettor in the vehicle but the air cleaner duct will need to be detached and the carburettor top cover disconnected and removed. 2 Check that the floats are not punctured and also that the float arm pivot pin and support holes are not excessively worn. 3 With the top cover inverted and the gasket in position, measure the distance (A) from the gasket to the tip of the float (see illustration). This distance should be in accordance with the float level specified for the carburettor type. 4 If adjustment is necessary, carefully bend the float tongue (which bears on the needle) in the required direction and recheck the level setting. Further adjustment may be necessary to achieve the correct adjustment (see illustration). 5 If the difference in height of each float exceeds 1 mm, bend the float link arms so that they are level then recheck the float setting. 6 When refitting the top cover to the carburettor main body, use a new gasket.
Strangler (choke) flap setting
7 This check can be made with the carburettor in the vehicle but the air duct must be detached. Run the engine to provide the necessary manifold vacuum. 8 Pull the choke lever to its full extent and retain it in position. This will subject the
16.5 Solex 34 PBISA mixture adjustment screw (2)
17.3 Solex 30-30 and 32-34 Z 2 float level setting (A)
Fuel and exhaust systems - carburettor models 4A·15
17.4 Solex carburettor - float level setting adjustment 1 Float arm link anti-flooding capsule to a vacuum of 350 mbar and should open the strangler flap the specified amount. To check the flap opening, insert a gauge or twist drill down between the flap and the inner wall of the venturi (B) (see illustration). 9 If necessary, adjustment can be made to open or close the flap to the specified clearance by turning the adjustment screw (see illustration) in the required direction. 2 Float tongue
17.8 Solex carburettor - strangler (choke) flap clearance (B)
Primary choke valve (throttle) setting
10 The carburettor must be removed and inverted for this check.
11 Hold the strangler flap in the closed position and check the clearance between the outer edge of the butterfly valve and the venturi wall (see illustration). To check the clearance, insert a gauge or twist drill of the same diameter as the specified clearance between the two. 12 If adjustment is necessary, prise free the tamperproof cap from the adjustment screw and turn the screw in the required direction to set the clearance (see illustration). On completion, a new tamperproof cap should be fitted but this must be entrusted to your Citroën dealer as a special tool is required.
Strangler (choke) flap setting
2 A special Citroën gauge (OUT 180143-T) is required to make this check. If this gauge is not available, then the check will have to be made by a Citroën dealer (see illustration). 3 Start and run the engine up to its normal operating temperature, when the cooling fan will cut in and then out. 4 Remove the air intake duct from the carburettor. 5 Remove the cover from the automatic choke housing (see illustration 15.6a). 6 Locate the gauge into position and check that the mobile roller is correctly positioned between the two gauge slots. If not, turn the adjustment screw of the heat-extensible capsule to meet this requirement (see illustration). Prevent the nut from turning by using a 3 mm diameter drill (see illustration). 7 Now reposition the gauge so that it is as shown (see illustration) and, with the engine running at idle speed, check that the strangler flap is open to give a gap of 6 ± 1 mm between its outer edge and the wall of the carburettor. Use a gauge or twist drill of suitable diameter to assess the clearance. If adjustment is necessary, turn the adjustment screw (A).
4A
18 Solex carburettors 32-34 Z1 CIT 319, W 319 and 34-34 Z1 381 - adjustment
3
Note: The following adjustments were made with the carburettor in the vehicle
Float level setting
1 The float level setting check and adjustment procedure is similar to that described in the previous Section for other Solex carburettors. 17.9 Solex 30-30 and 32-34 Z 2 - choke flap adjuster (3) and idle screw (4)
17.11 Primary choke (throttle) valve-toventuri clearance (C)
17.12 Solex 30-30 and 32-34 Z 2 - primary choke valve adjuster screw location (5)
18.2 Special automatic choke gauge (OUT 180 143-T) for Solex carburettors
4A·16 Fuel and exhaust systems - carburettor models
8 Turn off the engine and leave the gauge in the previously set position. Open up the accelerator to its full extent, hold it in this position and check the strangler flap to-carburettor wall clearance which should be 8 mm. If this clearance is incorrect, prise open the actuating fork jaws (to increase the clearance) or pinch them together (to reduce the clearance) as necessary. 10 The engine speed should increase to between 2350 to 2450 rpm for models fitted with a shim on the choke cam or between 1700 and 1800 rpm for models without this shim. If the engine speed is not within these limits, adjust screw D. 11 Note that the above mentioned shim was fitted during manufacture to increase the engine speed during the choke phase when used during the first 600 miles. If still in position after this mileage has been covered, it can be removed by prising it free with a thin screwdriver (see illustration). 12 On completion, remove the gauge and tachometer, refit the choke cover and reconnect the air filter duct.
Primary choke valve (throttle) setting
18.6a Solex 32-34 Z1 W 319 - access aperture for screwdriver to adjust heat extensible capsule screw (arrowed) 9 Leave the gauge in the previously set position, connect up a tachometer to the manufacturer's instructions and restart the engine.
18.6b Solex 32-34 and 34-34 Z 1 - mobile roller adjustment for automatic choke control 4 Screwdriver 5 Special gauge (OUT 180 143-T) 6 3 mm drill 7 Nut 8 Movable roller
18.7 Solex 32-34 and 34-34 Z 1 - strangler flap opening check A Adjuster screw B Gauge/twist drill C Actuator fork jaws D Primary choke valve adjuster screw
18.11 Solex 32-34 Z1 CIT 319-1 - temporary shim (1). Remove after initial 600 miles
19.2a Solex 32-34 Z1 and 34-34 Z1 - strangler (choke) flap setting 1 Refer to illustration 19.2b 3 Roller 4 Primary choke flap adjustment screw
Fuel and exhaust systems - carburettor models 4A·17
19.2b Table relating temperature to distance "a" in illustration 19.2a
19.3 Solex 32-34 Z1 and 34-34 Z1 - strangler (choke) flap adjustment screw (5) essary by bending the actuator fork jaws (see illustration 18.7). 8 Refit the choke housing cover when adjustments are complete.
19 Solex carburettors 32-34 Z1 and 34-34 Z1 - adjustment
3
establish the opening of the primary choke throttle valve (see illustration 17.12). 5 This opening should be as sp