WÄRTSILÄ Vasa R22, Instruction Manual

Page: 150 / 297

Valve seat rings are fitted in the cylinder head for both inlet and
exhaust valves. The exhaust valve seat rings are cooled and hence
provided with two O-rings.
12.3.2 Dismantling the valves
1 Fit the tool assembly 846010 according to Fig 12-3.
2 Depress the springs by turning the device clockwise.
3 Knock at the center of the valve discs, one at a time,
whereby the cotters come loose and can be removed.
4 Unload the tool. The spring retainers and the springs can
now be removed.
5 Check that the valves move easily in the guides.
Caution! Note in which guide each valve was situated before removing
them.
Tool assembly for dismantling valves
12.3.3 Checking and reconditioning valves and
seats
1 Clean the valves, seats, ducts and guides as well as
the underside of the head.
2 Control the burning-off on the valve disc according to the
sketch Fig 12-4. The measure “Y” should be more than 5 mm
(nominal 6 mm) and measure “Z” should be less than 2 mm. If
the measures exceed these limits the valve must be replaced.
Fig 12-3
3212548932
12 Cylinder Head with Valves 22-9601
12 - 6 VASA 22