Maintenance
2745
−
1/A1
Winterthur Gas & Diesel Ltd.
Relief Valve for Cylinder Cover
Checking Blow-off Pressure
Tools:
1 Injector test bench
94272
1 High pressure hose
94935
1 Valve holder
94272C
2 Hydraulic distributor
94934A
1 High pressure oil pump
94931
1.
General
Each cylinder cover is provided with an indicator valve combined with a relief valve
(variant 1), which is connected by relief bore (RB) to the compression chamber. An
inadmissible high pressure peak in the compression chamber opens the valve and the
over-pressure is immediately reduced.
Variant 2 provides an indicator valve without relief valve.
Note: A relief valve which has blown off or valves leaking during engine operation
must be replaced at the first opportunity (with engine stopped only).
Note: A relief valve can not be repaired nor adjusted any more after having
blown-off.
Relief valves require no maintenance, however they should be checked in general at
every major engine overhaul. Basically leaking or damaged valves should be returned to
the manufacturer for inspection and repair.
WCH00945
3
8
BLOW-OFF PRESSURE
STAMPED IN
RB
I
I
MD
1
2
4
6
7
5
7
9
6
2
Fig. 1
2016
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