70
It has been found that the damage only gets worse in
very rare cases.
Check the camshaft bearing surface and cam profiles
for wear. The cams can be worn obliquely in the
lengthwise direction, for example.
This can be adjusted in milder cases by stoning the
cam profile. Replace the camshaft if there is any
other damage or wear.
When the camshaft is replaced, all the valve
lifters must be replaced at the same time.
Camshaft measurement
Camshaft measurement
Measure the camshaft bearing surface with a mi-
crometer. The maximum wear and ovality is
0.07 mm.
The straightness of the shaft is checked by indication.
The maximum run-out in relation to the end bearings
is 0.04 mm.
Measure the lift height (cam height) with a calliper
gauge, as in the illustration above.
Lift height C = A – B (The lift height can also be mea-
sured by the “Camshaft wear check” method on page
67.
Please refer to “Technical Data” for the measurements
of the camshaft and camshaft bearings. Also, please
refer to the table on page 68 for the lift height.
Camshaft bearing,
replacement
The bearings are pressed into their locations and must
be bored after pressing in. This means that the cam-
shaft can only be replaced in conjunction with a total
overhaul of the engine.
Oil holes in bearings
Check when you press the bearings in, that the oil
holes are centred on the corresponding oil duct in the
block.
The front camshaft bearing should be installed with
the groove aligned forwards.
Repair instructions
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