21-5 Timing Gears and Shaft
Camshaft, Wear Check
Rocker bridge removed.
Put a steel rule across the camshaft lobes, parallel with
the camshaft axis, to check whether the cam profiles
have been worn.
Measure the wear with a feeler gauge or wire gauge.
Alternatively, a digital caliper gauge can be used.
Compare the measured values with those specified in
Technical Data page 27.
Guidelines for replacement
In normal conditions, unevenness may occur on the sur-
face of engine camshaft lobes. This does not mean that
the camshaft has to be changed. These marks do not
have any negative influence on either engine perform-
ance or the durability of the engine and its components.
Examples of acceptable wear and unacceptable wear
are shown below.
Lighter scratches:
The camshaft does not need to be changed.
Hard wear:
IMPORTANT!
The camshaft and associated rocker arms must be
changed.
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