Operation5562−1/A1
Winterthur Gas & Diesel Ltd.
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1.2 Emergency Stop
The safety system activates the fuel shut-down pilot valve (7, Fig. 1), which
decreases the fuel pressure to less than 200 bar (in most conditions to 0 (zero) bar).
Therefore an injection is not possible.
Note: The fuel shut-down pilot valve (7) is one of three devices to shut down
the engine. The other devices are:
D Immediate injection stop (engine software)
D Fuel pump supply moved to 0 (engine software).
1.3 Emergency Operation
CAUTION
Damage Hazard: For emergency operation, make sure that the
knurled screw (10) is turned fully counterclockwise (up).
If there is a failure, the fuel pressure control valve (1, Fig. 1) will control the fuel
pressure control function when:
D There are missing or incorrect control signals
D The fuel pump actuator(s) is/are out of service
D A toothed rack is blocked.
The toothed rack of the fuel pump is locked in the middle position. This can be applied
to one fuel pump, or all fuel pumps that relate to the failure (see 0515−1, paragraph 2
Defective actuator).
If the fuel pressure is more than the opening pressure, the fuel pressure control
valve (1) will open, which gradually drains sufficient fuel to keep the adjusted
maximum pressure. If this occurs, a longer operation period must be prevented.
The knurled screw (10) must be turned fully counterclockwise (up) against the stop,
which decreases the opening pressure to approximately 600 bar. This makes sure of
safe operation over the full load range.
Note: When the fuel pressure control valve (1) opens, a loud whistling noise
indicates when fuel drains.
2014
Pressure Control Valve
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