Valve Spring: Service and Repair

NOTE: From October 1984 to January 1985 no Rotocaps were installed on exhaust valves and from January to May 1985 on intake valves.
Observe valve spring preload. Testing and Inspection


Removal:





1 Remove rocker arm. Service and Repair

CAUTION: Reinstall rocker arms in the same place from which they were removed.

2 Unscrew spark plugs.





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





NOTE: The numbers 0, 90, 180 and 270 (arrows) are stamped into the vibration damper.

In the following positions of markings opposite the indicator the pistons are at TDC as follows:

Marking number Piston at TDC
0 1 and 6
90 5 and 3
180 4 and 7
270 8 and 2

4 Support valves by means of compressed air (cylinder leak tester).

CAUTION: The valves should not be seated on the piston crown to prevent bending of the valves.





5 Push valve spring retainer down by means of spring compressor.
6 Remove valve cone halves with the magnetic finger.
7 Remove valve spring retainer and valve spring.
8 Check valve spring, replace if necessary. Testing and Inspection

Installation
9 Insert valve spring with tight coil facing cylinder head.
10 For further installation proceed vice versa to sequence of removal.