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. 2) from the top housing (4).
5) Close the 3/2-way valve 35-36HA in the control air supply A. This releases the
pressure in the air pipe to the exhaust valves and the exhaust valve stays open.
6) Apply a thin layer of oil to the thread of the pressure element (2, tool 94259).
7) Install the pressure element (2).
Note: Make sure that you do not lose the shim(s) (3). The shim(s) must stay in
position when the pressure element (2) is installed.
For safety, the pressure element (2) must also be installed if an exhaust valve is
caught in the open position.
8) Disconnect the electrical connection (7, Fig. 1) from the 4/2-way valve (8) of the
related VCU (1).
9) Open the 3/2-way valve 35-36HA to the operation position.
10) Set to on the main bearing oil supply.
11) Disconnect the control signal connection from the starting air valve
30-2728_CX_1.
Note: The same conditions are applicable for the engine load as those given in
paragraph 2.2.
12) 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.
3.2 Cut In the VCU
1) Make sure that the servo oil service pump is set to off.
2) Set to off the main bearing oil supply.
3) Close the 3/2-way valve 35-36HA 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.
4) Remove the pressure element (2, Fig. 2). Make sure that you do not lose the
shim(s) (3).
5) Apply a thin layer of oil to the thread of the damper (1).
6) Install the damper (1).
7) Open the 3/2-way valve 35-36HA to the operation position.
8) Connect the electrical connection to the 4/2-way valve (8, Fig. 1).
9) Start the injection (see 0510−1, paragraph 2)
10) Set to on the servo oil pump.
11) Connect the control signal connection to the starting air valve 30-2728_CX_1.
12) Set to on the main bearing oil supply.
Operation with Exhaust Valve Control Unit Cut Out
2014
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