CITROEN CX 1988 Service Manual

CARBURATION
SPECIFICATION AND PARTICULAR FEATURES
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SPECIFICATION AND SPECIAL FEATURES
OF THE AIR SUPPLY SYSTEM
Engines types 829.A5 and J6T.A500 are fitted with a device regulating the temperature of intake air.
This device has been designed for maintaining a minimum temperature of the air drawn into the carburettor
It consists of a thermal sensor and a vacuum capsule operating a flap. Thermal source
The thermal sensor is located in the pipe connecting the air filter to the inlet manifold of the carburettor
This bi-metal type thermostat, is subjected to the inlet air temperature
It controls the opening of valves allowing passage for a depression towards the capsule
This depression is picked up by a union having a calibrated orifice, fitted to the pipe connecting the oil breather
to the intake manifold of the carburettor, and by a T-shaped union situated near the carburettor base plate, so
as to have an action over the engine load.
The thermal sensor allows the depression to circulate when the temperature is below 15°C and stops it when the
temperature exceeds 25°C. Vacuum capsule.
The capsule, located in the inlet of the air filter, is subjected to the depression. When energised, it operates a flap
which lets the heated air coming from a tapping located on the exhaust shield enter. At rest, the flap lets intake
air coming from behind the grill enter.

CARBURATION
CHECKING THE PETROL SUPPLY
8531

CHECKING THE PETROL SUPPLY
829.A5-J6T.A500
Pump AC DELCO TYPE: PB3
CHECKING THE PETROL PRESSURE WITH APPARATUS 4005-T:
- Position apparatus 4005-T.
- Disconnect the carburettor fuel return pipe; fit plug (2)
- Unscrew tap @ by one turn approx.
- Start the engine.
a) Check the petrol pressure at zero delivery:
- Fully screw up the tap; the pressure should not show a reading of more than 325 m.bar for the stabilised
pressure.
b) Check the tightness of the pump delivery valve:
- Stop the engine: there should not be a sudden drop in pressure.
c) Check the tightness of the carburettor needle valve:
- Unscrew tap @ ; start the engine, leave it running for a few minutes.
- Stop the engine: there should not be a sudden drop in pressure.
- Remove apparatus 4005-T and fit the fuel supply pipe and the fuel return pipe to the carburettor
(after plug (2) has been removed).
CHECKING THE PUMP FOR LEAKS:
Close the pump delivery tube. Blow compressed air under 800 m.bar pressure into the suction pipe. Immerse the
pump in a container filled with clean White Spirit: no leak should be detected.

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I 1 M25/659
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( BOSCH A 280 500 141 (
( BOSCH A 280 500 160
( / BOSyA450024 108 BOSCH A 580 112 368
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