Maintenance
2751−4/A1
RT-flex58T-E
Winterthur Gas & Diesel Ltd.
1/ 2
Tools:
1 Feeler gauge 94122
1 Valve grinding device 94291
1 Gauge 94292
1. General
Grinding in a valve together with its valve seat with grinding paste is not permitted.
Valves which have had the seating surfaces badly damaged by pitting or corrosion
have to be reground by machine. It is strongly recommended that a suitable grind-
ing device 94291 be made available.
Remark: A valve spindle with missing rotation wing may not be reground. The
wing hub must be shrink-fitted on the valve shaft by heating it to 480 _C. Grinding
may first begin after the whole unit has cooled down.
The devices from the makers ’HUNGER’ and ’CHRIS - MARINE’ are well proven
for valve grinding and can also be ordered directly from Wärtsilä Switzerland Ltd.,
Winterthur.
2. Grinding the seating surface
D Only as little material as necessary should be
ground off the valve seating surface to provide a
clean and smooth finished surface.
Only grind with cooling (wet).
D In order to avoid the appearance of chatter marks
on the seating surface, the grinding machine
should be placed in an area which is free of vibra-
tion from running machinery or engines, etc. If
necessary the grinding machine should be stood
on a rubber mat.
Remark: For the application of the grinding device re-
fer to the operating instructions.
SEATING SURFACE
ANGLE ON VALVE
A
a
016.744/08
+10’
a = 30 _
+12’
94291
Exhaust Valve
Grinding the Seating Surface on the Valve Head
2013
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