Operation8019−1/A1
Winterthur Gas & Diesel Ltd.
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4. Fuel Leakage System
The level switches (LS) monitor all important leakages in the fuel system.
If there is too much leakage, the related alarm is activated.
Level switch Monitored components
LS3444A Leakages (fuel and servo oil) from the rail unit
LS3446A HP fuel pipes to injection valves (13, Fig. 1)
LS3426A HP fuel pipes (8) and fuel leakage pipes (19)
4.1 Leakage Inspection Points
You use the leakage inspection points (40) to help you find possible leakages from
the HP fuel pipes (8).
4.2 HP Fuel Pipes − Leakage
If the level switch (39) (LS3426A) has activated an alarm, do the procedure that
follows:
WARNING
Injury Hazard: Always put on gloves and safety goggles when you
do work on hot components. When you open the screw plugs,
fuel can come out as a spray and cause injury.
1) Carefully loosen each of the screw plugs (8, Fig. 2) on the flange (5) of the HP
fuel pipe (1), a maximum of two turns.
2) Do a check to see if fuel flows out or not as follows:
a) If fuel flows out, the related HP fuel pipe (1) is defective.
b) If fuel does not flow out, tighten the screw plugs (8).
3) Carefully loosen each of the screw plugs (9) on the flange (6) of the HP fuel
pipes (2), a maximum of two turns.
4) Do a check to see if fuel flows out or not as follows:
a) If fuel flows out, the related HP fuel pipe (2) is defective.
b) If fuel does not flow out, tighten the screw plugs (9).
5) Carefully loosen each of the screw plugs (10) on the flange (7) of the HP fuel
pipes (3), a maximum of two turns.
6) Do a check to see if fuel flows out or not as follows:
a) If fuel flows out, the related HP fuel pipe (3) is defective.
b) If fuel does not flow out, tighten the screw plugs (10).
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 fuel pipe cannot be replaced immediately (or the engine must
continue to operate), then the fuel supply of the related fuel pump must
be set to 0% (see 4002-2, paragraph 3.7 Fuel injection).
7) If necessary, replace the defective HP fuel pipe (see the Maintenance
Manual 8752-1).
Note: When a fuel pump is cut out, operate the engine only at decreased load
(see 5556-1 Fuel Pump).
2014
Fuel System
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