74
6.
Remove the thrust washer.
7.
Fit extractor 8079.
Crank the camshaft one turn so that the valve tap-
pets are moved aside.
8.
Remove the camshaft.
9.
Remove the valve tappets.
Always check the tappets.
Checking
Check cams and bearing races for wear. Cams can
wear at an angle. Slight angle wear can be reme-
died by honing the cams.
With more extensive damage, replace the camshaft.
Use a micrometer and measure the wear on the
bearing races. Max. permitted wear and out-of-
round is 0.05 mm.
Check camshaft straightness with a dial indicator.
Max. permitted warp is 0.04 mm. Otherwise con-
cerning measurements for the camshaft and bear-
ings, refer to “Specifications”.
The camshaft bearings are pressed into their seats and
thereafter bored. Special tools are required for this. The
camshat bearings, therefore, can only be renewed
where there is proper equipment for machining the
bearings.
When pressing in the bearings, check to make sure the
lube holes coincide with the oil drillings in the cylinder
block.
Concerning machining measurements, refer to “Speci-
fications”.
Tightening torqe
Nm
kpm
Bearing brackets for rocker
arm shaft ........................................... 40
±
4
4.0
±
0.4
Timing gear cover ............................. 50
±
5
5.0
±
0.5
Sump ................................................. 18
±
2
1.8
±
0.2
Sump cover ....................................... 24
±
2
2.4
±
0.2
Thrust washer, camshaft ................... 40
±
4
4.0
±
0.4
Camshaft gear (M-thread) ................ 60
±
5
6.0
±
0.5
8079
