43. Camshaft and Bearings Clean and Inspect

Camshaft and Bearing Cleaning and Inspection
Tools Required
J 7872 Magnetic Base Dial Indicator Set





1 Clean the Camshaft with cleaning solvent.

CAUTION: Refer to Cleaning Solvent Caution in Service Precautions.

2 Inspect the camshaft for the following conditions:
- Scored Camshaft bearing journals (1)
- Damaged camshaft Lobes (2)
- Damaged camshaft locator pins (3)
- Damaged Threads (4)





3 Measure the camshaft journals using a micrometer.
If the camshaft journals are not within specifications, replace the camshaft.





4 Measure the camshaft runout using the J 7872.
4.1 Mount the camshaft in the V-blocks between the centers.
4.2 Use the J 7872 in order to measure the intermediate camshaft journal.
5 Measure the camshaft lobe lift using the J 7872.
5.1 Lubricate the camshaft using GM P/N 10523654 or the equivalent.
5.2 Set the camshaft on V-blocks.
5.3 Use the J 7872 in order to measure the lobe lift.
6 If the runout or lobe lift is not within specifications, replace the camshaft.