Removal and Installation of Rocker Arms and Rocker Arm Brackets

NOTE: Always install rocker arm at the same spot from where it has been removed.
If the rocker arms are renewed, also renew camshaft.
On rocker arms with carbide facing, renew damaged rocker arm only.

Removal

Model 116.120:

Model 116.120

1 Disconnect regulating linkage to remove cylinder head cover. Pull out locking eye of longitudinal regulating shaft (arrow).

Model 123:

Model 123

On models 116.120 and 123, pull longitudinal regulating shaft out of rubber mount in forward direction and remove in rearward direction.

Model 126.120:

Model 126.120

On model 126.120, pull longitudinal regulating shaft out of guide lever in rearward direction and remove in forward direction.






On models 123 with automatic transmission 722.303 (W 4 A 040) and 126.120, pull out central plug of vacuum lines (71) or vacuum lines. Disconnect Bowden wire, compress black plastic clip (arrow) and pull Bowden wire out of holder in rearward direction.






2 Set camshaft in such a manner that the rocker arm is free of load. That is, the cam tips should point away from rocker arms.

For this purpose, rotate the crankshaft by means of the tool combination.






3 Screw out fastening screws of rocker arm bearing brackets (arrows).






4 Completely remove rocker arm group in upward direction.

Loosen stuck camshaft bearings by means of light blows with a plastic hammer.


Installation





5 Set complete rocker arm group and screw down.

NOTE: The rocker arm bearing brackets are located by means of fitted sleeves (arrows).






6 Adjust valve clearance. Valve Clearance
7 Mount cylinder head cover.