WinGD WARTSILA RT-flex58T-D, Maintenance Manual

Page: 194 / 498

Maintenance
2751 − 4/A1
RT-flex58T-D
Winterthur Gas & Diesel 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 9
mm.
Exhaust valves cannot be reconditioned anymore, when the loss of material is
more than 9 mm, but can be kept in operation up to 16 mm loss of material.
Remark: Reconditioning of exhaust valves may, however, only be carried out by a
Wärtsilä Switzerland Ltd authorized repair workshop.
B
C
003.454/00
max. 3 mm
94292
max. 9 mm
Exhaust Valve: Grinding the Seating Surface on the Valve Head
2013
CHECK