WinGD X72 - Procedures; 4 Defective Flow Limiter Valve

Operation
0515−1/A1
Winterthur Gas & Diesel Ltd.
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3.3 Procedures
3.3.1 Injection Valve
1) The fuel injection must be cut out immediately (if not automatically cut-out). See
0510−1, paragraph 1 Cut Out the Injection.
Note: When the injection is cut out (Inj. CUT OFF) the engine can only be
operated at decreased load.
2) Replace the defective injection valve as soon as possible (see 0510−1,
paragraph 2 Injection start and the Maintenance Manual 2722−1 Injection valve).
3.3.2 Injection Pipe
1) If an HP fuel pipe to the injection valve breaks, cut out the injection (see 0510−1
Operation with Injection Cut Out).
2) Replace the defective high pressure fuel pipe as soon as possible (see 0510−1,
paragraph 2 and the Maintenance Manual 2733−1 Injection Valve).
CAUTION
Damage Hazard: If the rail pressure continues to decrease
because of the leak, replace the high pressure fuel pipe
immediately.
4. Defective Flow Limiter Valve
The flow limiter valve prevents a pressure release in the fuel rail if an HP fuel pipe to
the fuel injectors breaks.
The flow limiter valve does not shut off the fuel flow when smaller problems cause an
increase in fuel injection to the cylinder (e.g. one fuel injector closes incorrectly, or the
nozzle is damaged). To make sure that the engine can continue to operate, the
related cylinder must be cut out (see 0510−1, paragraph 1 Cut Out the Injection).
If the in-cylinder pressure and exhaust gas temperature of a cylinder have large
differences when compared to other cylinders, the indications show that:
D The injector does not close
D The injection nozzle is damaged.
In this condition, you must cut out the related cylinder.
If the exhaust gas temperature and in-cylinder pressure continues to have large
differences (after the injection is cut out), there is leakage from the injector into the
cylinder.
To prevent fuel flow through the defective injector, manually select the flow limiter
valve. All injectors of the related cylinder will inject the maximum fuel quantity at a
specified late injection start (e.g. energize time at 20% load). This manual check is
only possible below e.g. 20% load.
2014
Faults in High Pressure Fuel System