Cam Lobes

Inspect the camshaft lobes for scoring and signs of abnormal wear. Lobe pitting in the general area of the lobe toe does not harm camshaft operation. The camshaft should not be replaced unless the lobe lift loss has exceeded specification or pitting has occurred in the lobe lift area.





The lift of the camshaft lobes can be checked with the camshaft installed in the engine or on centers.
To measure the camshaft lobe lift, proceed as follows:
1. Measure distance between major (A-A) and minor (B-B) diameters of each cam lobe with a Vernier caliper and record readings. The difference in readings on each camshaft diameter is lobe lift.
2. If readings do not meet specification, replace camshaft.