Valve Spring: Service and Repair

Removal





Model 116.120

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






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

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. disconnect central plug for 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 Remove rocker arm with rocker arm bearing brackets. Service and Repair






3 Set piston of respective cylinder to ignition TDC.
For this purpose, rotate crankshaft with tool combination.






4 Place holding wrench on valve spring retainer.






5 Unscrew cap nut (63) by means of valve adjusting wrench.
For this purpose, apply counterhold to counternut (63a) by means of second valve adjusting wrench.
6 Unscrew counternut (63a).
7 Remove valve spring retainer and valve spring.
8 Check valve spring, renew according to condition.


Installation





9 Insert valve spring with narrow coils toward cylinder head (color dots at top).






10 Mount valve spring retainer.
Lug on valve spring retainer (arrow) should be seated in groove on valve stem.
11 Screw on counternut and cap nut.
12 Install rocker arm with rocker arm bearing brackets.
13 Adjust valve clearance. Valve Clearance
14 Mount cylinder head cover.