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Cam gears are either pressed
or bolted to the camshaft. Although it is uncommon,
cam gears sometimes break. Inspect them for cracks.
To do this, you will need to partially disassemble
the engine.
The gear on the camshaft may
be steel for heavy-duty applications, or it may be
made of aluminum or pressed fiber when quiet
operation is a major consideration.
The gears are helical in
design. Helical gears are used because they are
stronger and also tend to push the camshaft backward
during operation to help prevent the camshaft from
walking out of the block.
Courtesy of Ford Motor
Company.
Wear in the chain,
gears, or sprockets means a timing lag, which
results in poor engine performance.
There are factory timing marks
on the crankshaft gear or sprocket and on the
camshaft gear or sprocket.
Factory timing marks can be
found on the camshaft and crankshaft sprockets.
The timing marks on all the
gears must be positioned according to the
manufacturer's instructions.
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