Operation
0520−1/A1
Winterthur Gas & Diesel Ltd.
3/ 4
3. Emergency Operation with Exhaust Valve Open
This mode of operation is only necessary if there is water leakage into the combustion
chamber (see also 0545−1).
3.1 Exhaust Valve − Stop Operation
1) Stop the engine.
2) Make sure that the servo oil service pump is set to off.
3) Set to off the main bearing oil supply.
4) Remove the damper (1, Fig. 3) from the housing (2).
5) Close the 3/2-way shut-off valve 4.08 in the control air supply A. This releases
the pressure in the air pipe to the exhaust valves and the exhaust valve stays
open (see 4003−2 Control Diagram).
6) Apply a thin layer of oil to the thread of the pressure element (4, tool 94259).
7) Install the pressure element (4).
Note: Make sure that you do not lose the shim(s) (3). The shim(s) must stay in
position when the pressure element (4) is installed.
For safety, the pressure element (4) must also be installed if an exhaust valve is
caught in the open position.
8) Open the 3/2-way shut-off valve 4.08 to the operation position.
9) Set to on the main bearing oil supply.
10) Disconnect the control signal connection (5) from the starting air valve.
11) After the procedure above is completed, the engine can be put back into service.
Note: The same conditions are applicable for the engine load as those given in
paragraph 2.2.
3.2 Cut In the VCU
1) Make sure that the faces of the valve seat and the valve head are in perfect
condition (no hard dirt particles).
Note: If there are hard dirt particles on the faces of the valve seat and valve
head, an overhaul is necessary. See the Maintenance Manual, 2751−3 and
2751−4.
2) Make sure that the servo oil service pump is set to off.
3) Set to off the main bearing oil supply.
4) Close the 3/2-way shut-off valve 4.08 in the control air supply A (see 4003−2
Control Diagram). This removes all of the air from the air pipe to the exhaust
valves. The exhaust valve stays open.
5) Remove the pressure element (4, Fig. 3). Make sure that you do not lose the
shim(s) (3).
6) Apply a thin layer of oil to the thread of the damper (1).
7) Install the damper (1).
8) Open the 3/2-way shut-off valve 4.08 to the operation position.
9) Start the injection (see 0510−1)
10) Set to on the main bearing oil supply.
11) Connect the electrical connections to the rail valve.
12) Connect the control signal plug (5) to the starting valve.
Operation with Exhaust Valve Control Unit Cut Out
2014
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