WinGD X72 - 3 Defective Injection Valve; Fault Identification; Causes

Operation0515−1/A1
Winterthur Gas & Diesel Ltd.
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2.3.2 All Actuators are Defective
1) To install the distance pieces (6, Fig. 1) to the toothed racks (3), see steps a) and
b):
a) For engines with two fuel pumps, install the distance pieces (6) to get:
D One fuel pump in the 0% fuel position and the other fuel pump in the
100% position.
b) For engines with three fuel pumps, install the distance pieces (6) to get:
D One of the fuel pumps in the 0% fuel position and the other two fuel
pumps in the 100% position.
Note: For higher loads, set more fuel pumps to the 100% position.
3. Defective Injection Valve
During engine operation, the open/short circuit of the injector is monitored.
When you manually activate the Injector Analysis Mode, only one injector operates in
the related cylinder (this is done in cylinder balancing in an engine load range of
between 20% and 30%).
When there is an external change command from the cylinder balancing function, the
next injector operates. See the data that follows:
D When the Injector Analysis Mode = 0, all injectors operate
D When the Injector Analysis Mode = 1, injector No.1 operates until the next
change command, then
D When the Injector Analysis Mode = 2, injector No.2 operates until the next
change command, then
D When the Injector Analysis Mode = 0, all injectors operate again.
The command change occurs after a specified time. The cylinder balancing function
records the firing pressure and exhaust gas temperature data.
3.1 Fault Identification
D Failure indication in the ECS (see 4002−2 LDU−20, paragraph 3.15 Log
messages).
D The fuel injection is cut out automatically (Inj. CUT OFF) on the related cylinder,
which activates a SLOW DOWN signal.
D The level switch LS3446A shows an alarm because of leakage of the high
pressure fuel pipes to the injection valve (see 8019−1, paragraph 4 Fuel Leakage
System).
3.2 Causes
D Electrical interference (cable connections defective, parting of a cable etc).
D The solenoid valve is defective.
D The needle cannot move from the closed position.
D The needle cannot move from the open position.
D The injection valve is defective.
D Leakage from the sealing surfaces on each side of the high pressure pipe.
2014
Faults in High Pressure Fuel System