Maintenance
9308−1/A1
Winterthur Gas & Diesel Ltd.
1/ 3
Blow-off Pressure Check
Tools:
1 OBEL test bench 94272
1 Valve holder 94272C
1 HP oil pump 94931
2 Pressure gauge 94934A
1 HP hose 94935
1. General
Some cylinder covers have an indicator valve installed together with a relief valve.
Other cylinder covers have only an indicator valve. This procedure is only applicable
for the cylinder covers that have an indicator valve together with a relief valve (see
Fig. 1).
If the pressure in the compression chamber is more than the specified blow-off setting
of the relief valve, the relief valve opens. The pressure is immediately released. You
must then replace the relief valve as soon as possible. Relief valves cannot be
adjusted or repaired. You must replace a relief valve that leaks.
It is not necessary to do maintenance on the relief valves.
Relief valves that leak, or have damage must be returned the manufacturer for
inspection and repair.
2. Preparation
1) Stop the engine.
3. Removal
1) Open the indicator valve (1, Fig. 1) to
make sure that there is no pressure in
the compression chamber (3).
2) Remove the relief valve (2) from the
adapter (4).
Relief Valve on Cylinder Cover
2015
Fig. 1
2
1
WCH02960
3
4
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