WinGD X72 - Page 456

Operation8019−1/A1
Winterthur Gas & Diesel Ltd.
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4.4 Leakage Check of Pressure Control Valve
Do the following procedures after emergency operation or maintenance on the fuel oil
system only.
WARNING
Injury Hazard: Always put on gloves and safety goggles when you
do work on hot components. Fuel can come out as a spray and
cause injury.
WARNING
Injury Hazard: The fuel system has high pressure. Replace the
defective pressure control valve only when the engine has
stopped.
Make sure that the engine is ready for operation (see 0110−1, paragraph 2 Prepare
for Operation).
1) In the LDU-20, get the USER PARAMETERS page, then select the button AIR
RUN to turn the engine with air (see 4002-2, paragraph 3.10 User parameters).
2) If pressure decrease is unusually high during the air run, do a check of the
pressure control valve (1) (see the procedure given in the Maintenance Manual
5562-1).
3) Start the engine (see 0230-1 Operation during Usual Conditions, Engine Start).
4) Open the cover (11) on the rail unit (12) (see Fig. 4)
5) Do a check for unusual noise from the pressure control valve (1).
a) If you hear an unusual noise (a continuous sound like a whistle whistle), stop the
engine and do a check of the pressure control valve (1) (see the Maintenance
Manual 5562-1).
b) If necessary, replace the pressure control valve (1) immediately (see the
Maintenance Manual 5562-1 Fuel Pressure Control Valve).
6) Do a check of the temperature of the fuel return pipe (6).
a) If the fuel return pipe (6) is hot, stop the engine and do a check of the pressure
control valve (1) (see the Maintenance Manual 5562-1).
b) If necessary, replace the pressure control valve (1) immediately (see the
Maintenance Manual 5562-1).
7) Close the cover (11) on the rail unit (12).
2014
Fuel System