52
Rocker mechanism,
reconditioning
Special tools: 999 1867
1
Remove the snap rings from the rocker arm shaft and
remove rocker arms, bearing supports and springs.
2
Clean the components; be particularly careful with the
oilway in the bearing supports (44/300 series) and the
rocker arm shaft and rocker arms oil holes.
3
Check the rocker arm shaft wear and the plug tight-
ness in the shaft ends, and that the ball pin spherical
part is not deformed or worn. Threads should be un-
damaged on the pin and locknut. The nut hexagon
should also be in condition. The rocker arms mating
sphere against the valve should not be unevenly worn
or concave. Slight wear can be adjusted with a
grinder. Ovally worn rocker mechanism are replaced.
4
Press out the rocker arm bushing with drift 999 1867.
Repair Instructions
5
Turn the drift and press the new bushing into place.
NOTE! Ensure that the bushing oil hole is opposite
the oilway in the rocker.
6
Ream the bushing to an exact alignment on the
shaft.
22.020–22.041 mm
Remove any swarf resulting from the work.
7
Lubricate the rocker arm shaft and install the sep-
arate parts. Ensure that the snap rings on the rocker
arm shafts are properly locked in their grooves.
Applies to 44/300 series
8
There are two variants of valve yoke (tappet). The
hole shown below can occur on the right-hand or
left-hand side of the yoke, and can be mixed with no
problems during assembly.
