Group 21 Service procedures - engine
33
Rocker arm mechanism,
reconditioning
Special tools: 999 1801, 999 2000, 999 2457, 999 6225, 999
6352, 999 6478, 998 6173, 998 6175
1
Remove the locking plugs using tools 998 6173 and 998
6175.
2
Clean all parts. Pay particular attention to the oil drilling in the
bearing bracket as well as the rocker arm shaft and rocker
arm oil holes.
3
Check the wear on the rocker arm shaft and the ball screw.
The threads on the ball pin and lock nut must be in good con-
dition. The surface of the rocker arms which is in contact
with the valve must not be worn or pitted.
4
Press out the rocker arm bushing using tools 999 1801,
999 2457 and 999 6352.
5
Fit the new bushing using tools 999 1801 and 999 6478
making sure that the oil holes align with the oil channels
in the rocker arms. The slit in the bushing must point diag-
onally upwards.
Note: On completion of pressing, machine-ream the bush-
ings.
6
Oil the rocker arm shaft and fit the rockers.
7
Fit the new locking plugs.
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