- Clean the camshaft in solvent and allow to dry.
- Inspect the camshaft for obvious signs of wear: scores, nicks or pits on
the journals or lobes. Light scuffs or nicks can be removed with an oil stone.
- Using a micrometer, measure the diameter of the journals and compare to
specifications. Replace the camshaft if any journals are not within specification.
- Measure the camshaft lobes across their maximum lobe height dimensions,
using a micrometer. Compare your measurements with the lobe height specifications.
Replace the camshaft if any lobe heights are not within specification.
- Mount the camshaft in V-blocks with the front and rear journals riding on
the blocks. Check if the camshaft is bent using a dial indicator on the center
bearing journal. The limit at the center journal is 0.0012 in. (0.03mm). Replace
the camshaft if runout is excessive.
- Check the camshaft endplay with the camshaft laying in the cylinder head
on the lower bearing journals. Mount a dial indicator to the front of the
cylinder head with the indicator foot resting on the end of the camshaft.
Move the camshaft back and forth and observe the indicator. Compare the reading
with the specification. If endplay is excessive, replace the camshaft or the
cylinder head.
- Inspect each adjuster/follower for wear, pitting and scuffing.
- Ensure that the adjuster/follower-to-camshaft contact surface is not convex
or excessively worn.