01:01-02
©
Scania CV AB 1997-05:2 11
Program 96
Valve seats
Changing
1. Remove valve seat rings. Use an old valve
which has been machined so that the diame-
ter of the head is slightly smaller than the
inside diameter of the seat.
2. Place the valve in position and weld it all
round using an arc welder. Cool with water.
Turn the cylinder head over and tap the valve
stem so that valve and seat ring fall out.
Wear protective goggles!
WARNING!
!
Always turn the cylinder head with the
underside down when the valve seat ring
is being tapped out. Otherwise, there is a
risk of loose swarf causing injury.
3. Press in new valve seat rings. Use drift
98 503 and shank 98 500. Cool the drift and
valve seat to about -80 °C in dry ice or liquid
air. The rings must be pressed in very
quickly.
WARNING!
!
Take care when using the above coolants
and cooled parts. Danger of frostbite.
Oversize valve seat rings can be fitted if the valve
seat ring position has been damaged. The seat
must then be machined using tool 587 277.
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