Operation0515−1/A1
Winterthur Gas & Diesel Ltd.
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5. Defective Pressure Control Valve
5.1 Fault Identification
Fault identification of a defective pressure control valve (PCV) is as follows:
D The engine load decreases or the engine stops.
D The fuel system pressure is too low (alarm).
D The fuel pump supply is higher than usual or at maximum.
D You can hear a sound like a whistle when the engine operates.
5.2 Causes
The causes are as follows:
D The PCV is defective.
D The PCV has opened or has a leak.
5.3 Procedure
CAUTION
Damage Hazard: Replace the PCV only when the engine has
stopped. The fuel rail must have zero pressure.
1) Stop the engine.
2) Replace the defective PCV (1, Fig. 2) as soon as possible.
3) Make sure that there is no pressure in the fuel rail (4) as follows:
a) In the plant, set to off the fuel booster pump.
b) Close the shut-off valves to the fuel inlet and return.
c) Operate the button on the PCV.
d) On the fuel rail (4), loosen the drain screw (9) a maximum of two turns.
4) Replace the defective PCV (see the Maintenance Manual 5562−1).
2014
Faults in High Pressure Fuel System
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