Maintenance2751−4/A1 RT-flex50-D
Wärtsilä Switzerland Ltd
2/ 2
The wear condition can be checked at any time with gauge 94292 and feeler gauge
94122.
D Where the precise angle required has been obtained during grinding, a check
with marking blue with the valve on the reground valve seat in the valve cage
will show only a line contact or a very narrow band (extent of contact) starting
from the smaller diameter as shown in Fig. ’B’.
See also remarks in 2751−3 regarding the valve behaviour at running temper-
ature.
D A maximum of 3 mm may be ground off the valve seating surface. Valve
plates, where the seat surface has been ground back by more than 3 mm can
be reconditioned by build-up welding.
D On engines with arduous operating conditions, corrosion may form at the
bottom of the valve plate, after a longer operating time. Exhaust valves can be
reconditioned if the loss of material on the valve plate is less than or equal to 6
mm.
Exhaust valves cannot be reconditioned anymore, when the loss of material is
more than 6 mm, but can be kept in operation up to 13 mm loss of material.
Remark: Reconditioning of exhaust valves may, however, only be carried out by a
Wärtsilä Switzerland Ltd authorized repair workshop.
94292
B
max. 3 mm
max. 6 mm
013.547/05
013.548/05
013.549/05
C
Exhaust Valve: Grinding the Seating Surface on the Valve Head
2011-12
CHECK
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