Checking parts:
– Check correct dimensions of bushing
for rocker (89/14), rocker shaft (89/15)
and rocker pad radius. For values, see
Section 4.
– Check valve guides and valve stems for
wear; see Section 4.
– Inspect the cylinder head for cracks (in
webs) and unevenness of the sealing
surface.
– Examine the valve seat rings and valve
collets for wear. Note valve recess in
head; see Fig. 90 and Section 4.
Reconditioning cylinder head:
– If necessary, press the valve guides out
with pressing-in tool - 1 -, Fig. 91.
– Press in new valve guides with the
same tool - 1 -.
Note:
The pressing-in depth must be correct; for
projection, see Fig. 92.
– Ream out the valve guides to nominal
diameter with hand-held reamer - 2 -,
Fig. 91.
– If the valve seats are leaking or have
been damaged locally, or after installing
new valve guides, they must be rema-
chined. This is carried out with special
milling cutters which are available com-
mercially.
– Only mill away sufficient metal to elimi-
nate patches on the surface of the valve
seat.
– After this, lap in the valves (with grin-
ding paste, grain size 180 - 250);
see Fig. 91.
3
L / M . . 09.96
90
91
92
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