Visual Inspection
Courtesy of GENERAL MOTORS CORP.
- Inspect the camshaft oil feed holes (1) to the camshaft position actuator for dirt, debris or blockage.
- Inspect the threaded hole (2) for damage.
- Inspect the camshaft position actuator locating notch (3) for damage or wear.
- Inspect the camshaft sealing grooves (4) for damage.
- Inspect the camshaft thrust surface (5) for damage.
- 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
- If any of the above conditions exist on the camshaft, replace the camshaft.