Operation
8016−1/A2
Winterthur Gas & Diesel Ltd.
7/ 13
4. Servo Oil System
The servo oil system controls the exhaust valve movement and the injection control
units. The necessary oil flows off from the bearing oil system. For more data see
Fig. 3 and Fig. 4.
4.1 Servo Oil Service Pump
The electrically-driven servo oil service pump (3) must be manually set to on and off.
The servo oil service pump (3) supplies the necessary pressure for exhaust valve
movement. The servo oil service pump (3) is also used to do a leak test before the
first commissioning, or after maintenance on the servo oil system.
CAUTION
Damage Hazard: Do not start the servo oil service pump if the
bearing oil pump is not in operation.
Note: The lubricating oil pump and servo oil service pump must only be set to
on after the air spring air supply is available and the exhaust valves are
closed.
The servo oil service pump increases the pressure in the fuel rail when necessary
through the tool 94583 (pipe) (see 8019−1 paragraph 3 and 0120−1 paragraph 4).
The servo oil service pump is not necessary for engine start or engine operation.
Note: The stop valves (15) and (16) must be open before commissioning (see
also 0130−1 Prepare the servo oil system).
Before you start the engine, make sure that the servo oil service pump is set to off.
4.2 Servo Oil System
Oil flows through the automatic filter (1), the supply pipes (5) and the supply pipe (13)
to the servo oil pumps (4).
CAUTION
Damage Hazard: Do not operate the engine if there is no oil
supply to the servo oil pumps. During operation, the stop
valve (14) must stay open.
The servo oil pumps (4) supply oil to the servo oil rail (7) through the high
pressure (HP) servo oil pipes (6). The pressure value is related to the engine load.
The leakage oil pipe (38) and the leakage inspection points (31) are attached to the
connecting block of the HP servo oil pipes (see paragraph 5).
Note: The flow sensors (32) (installed upstream of each servo oil pump)
monitor the oil supply from the servo oil pumps. If a servo oil pump
becomes defective, the alarm and monitoring system (AMS) activates an
alarm (see Servo Pump Unit 5591−1).
Servo oil flows from the servo oil rail (7) to the exhaust valve control units (9) and the
rail valves through the hydraulic pipes (10). The servo oil controls the movement of
the exhaust valve spindle. The servo oil then flows through the return pipe (36) and
back to the plant.
Servo oil also flows from the servo oil rail (7) through the flexible hose (24) to operate
the injection control units (12) and their rail valves. The servo oil then flows through
the flexible hoses (25) through the leakage oil pipes (42) and (43) to the return
pipe (52) and back to the plant.
The ball valves (26) and (27) are used when defective rail valves are replaced during
operation (see 0515−1, paragraph 3 Defective injection control unit).
2014
Lubricating Oil System 9-cylinders
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