Camshaft Visual Inspection

1. Inspect the camshaft oil feed holes (1) to the camshaft position actuator for dirt, debris or blockage.
2. Inspect the threaded hole (2) for damage.
3. Inspect the camshaft position actuator locating notch (3) for damage or wear.
4. Inspect the camshaft sealing grooves (4) for damage.
5. Inspect the camshaft thrust surface (5) for damage, debris or blockage.
6. Inspect the camshaft lobes (6) and journals (7) for the following conditions:

•	Excessive scoring or pitting

•	Discoloration from overheating

•	Deformation from excessive wear, especially the camshaft lobes

7. If any of the above conditions exist on the camshaft, replace the camshaft.

Camshaft Measurement

Important: No machining of the camshaft is allowed.

Important: If the camshaft measures outside the specified range, replace the camshaft.

1. With the camshaft (1) in a suitable fixture (2), measure the camshaft for wear.



2. Measure the camshaft (2) journals for diameter and out-of-round using an outside micrometer (1).



3. Measure the camshaft runout using a dial indicator (1).



4. Measure the camshaft thrust width for wear using a depth micrometer (A).



5. Measure the camshaft thrust wall surface for runout using a dial indicator (1).



6. Measure the camshaft lobes for wear using a dial indicator (1).



7. Place the dial indicator tip on the base circle (1) of the camshaft lobe.
8. Set the dial indicator at zero.
9. Rotate the camshaft until the indicator tip is at the highest point (2) on the lobe. This reading is the lift of the camshaft lobe.