Engine body - Service procedures
Valve springs, checking Check the length of the valve springs, unloaded and loaded, by using a spring gauge. The springs shall maintain the values given in the Workshop Manual, Technical Data for each engine concerned.
3 Check the wear on rocker arm shaft and ball pin. The threads shall be undamaged on the ball pin and lock nut. The contact surface on the rocker arm to the valve cap must not be worn or pitted. Adjustment in a grinding machine can be made in the event of less serious wear. Check the tightness of the cap plugs at the shaft ends. 4 Ovally worn rocker bushings are replaced. Press out the bushing with drift 2677; use drift 2267 as counterforce. Press in the new bushing with drift 2677. Make sure that the oil hole comes in the middle of the oil channel in the rocker arm.
Rocker mechanism, overhauling
The new bushing must be reamed after being pressed in.
Special tools: 2267, 2677
5 Oil in the shaft and assemble the parts.
1 Remove the circlips, rocker arms and shaft. 2 Clean the parts, observing special care with the oil channel in the bearing housing, and the oil holes in the rocker arm shaft and rocker arm.
30
