WinGD X72 - Page 454

Operation8019−1/A1
Winterthur Gas & Diesel Ltd.
6/ 9
4.3 HP Fuel Pipes to Injection Valves − Leakage
WARNING
Injury Hazard: Always put on gloves and safety goggles when you
do work on hot components. When drain screws and plugs are
opened, fuel can come out as a spray and cause injury.
If the level switch (17, Fig. 1) (LS3446A) activates an alarm, you must find the related
cylinder. Start at cylinder No.1 (driving end) and do the steps that follow on each
cylinder until you find the leakage:
1) On the fuel leakage pipe (6, Fig. 3), carefully loosen the screw-in union (5)
approximately two turns.
2) Do a check for fuel flow. If there is no fuel flow from the screw-in union (5) do the
procedure given in paragraph 4.4.
3) If fuel flows from the screw-in union (5), do step 4).
4) Make sure that the screws (4) are tightened correctly to 60 Nm as follows:
a) Symmetrically tighten the screws to 30 Nm.
b) Symmetrically tighten the screws to 60 Nm.
5) Do a check for fuel. If fuel continues to flow, an HP fuel pipe (1) is defective.
WARNING
Injury Hazard: The fuel system has high pressure. Replace a
defective HP fuel pipe only when the engine has stopped.
Note: If the HP pipe (1) cannot be replaced immediately, the injection of the
related cylinder must be cut out (see 0510−1 Operation with Injection Cut
Out).
6) Remove each of the three HP fuel pipes (1) until you find the defective HP fuel
pipe (see the Maintenance Manual 8733−1, paragraph 1).
7) Do a check for damage on the sealing face (7) of the defective HP fuel pipe (1). If
you find damage, you must grind the sealing face (see the Maintenance Manual
8733−1, paragraph 3).
8) If it is necessary to replace the defective HP fuel pipe (1), see the Maintenance
Manual 8733−1 and 0510−1, paragraph 2.2).
The related flow limiter valve will stay closed until the engine is stopped and the
pressure in the fuel rail (3) is released completely.
Note: When the injection is cut out (Inj. CUT OFF), you can operate the engine
only at decreased load.
2014
Fuel System