WÄRTSILÄ RT-flex50-D, Maintenance Manual

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Maintenance
2751−3/A1
RT-flex50-D
Wärtsilä Switzerland Ltd
1/ 5
Tools: Key to Illustrations:
1 Feeler gauge 94122 1 Valve seat AF Seating face
1 Valve seat fitting and dismantling device 94261 2 Valve cage HA Hammer
1 Gauge 94279 3 O-ring RC Eye bolt
1 Valve grinding device 94291
Overview
1. General 1/5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2. Removing the valve seat 1/5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3. Fitting the valve seat 2/5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4. Grinding the valve seat 3/5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5. Checking the valve seat 5/5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1. General
Valve seats of which the seat surfaces are badly damaged, or on which the wear
limit has been reached through frequent grinding, must be replaced.
The most advantageous position for replacing the valve seat is to bring the valve
cage in a vertical position as shown in Fig. ’A’.
Remark: When the valve seat must be removed with the valve cage in the inverted
upside down position, it must be suspended on the engine room crane slightly
above a wooden underlay. Device 94261 can then be attached from below and the
valve seat carefully withdrawn until it drops caused by its own weight (45 kg).
Therefore, the valve seat must be properly secured with additional wooden under-
lays. The distance to the wooden underlay is to be kept as small as possible to
avoid any accidents or damage.
2. Removing the valve seat (Fig. ’A’)
⇒
Fit both pairs of ring halves of the valve seat fitting and dismantling device
94261 into the groove on the circumference of valve cage 2 and valve seat 1
respectively.
⇒
With the aid of the jack screws of the valve seat fitting and dismantling device,
the valve seat can be pressed out of its seating in the valve cage.
D
Should a valve seat be removed for any reason, it must be reground by means
of valve grinding device 94291 before refitting.
94261
2
A
1
Exhaust Valve
Replacing and Grinding the Valve Seat
2010