Workshop Manual

Cylinder head
I 01-07-07
0312 1562 - 0138
3/4
© 11/2004
6
2011
Note
The valve set is a little wider after reworking.
If necessary, the valve seat width can be
reduced by reworking the outer correction
angle (1) and also the inner correction angle
(2) if necessary.
z Remove valve seat rotating device
z Remove chips.
© 39393 0
1
2
01 41 01 42
Check contact pattern
z Coat the sitting surface of the valve cone thinly with
varnish.
z Insert valve and turn 45° to 90°.
z Remove the valve and check the contact pattern.
Note
A continuous surrounding contact between
the valve cone and the valve seat ring must be
guaranteed at the greatest valve seat
diameter (outer contact) with a radial contact
percentage of 60 to 100%.
© 39461 0
z Clean valve and valve seat ring.
z Check valve lag
Î Job card W 01-07-08.
Note
Do not rework valve seat with lapping
compound.
© 39052 0