47. Camshaft and Bearings Cleaning and Inspection

Camshaft and Bearings Cleaning and Inspection

Tools Required
^ J7872 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 sprocket locator pins (3)
^ Damaged threads (4)
^ Damage to the camshaft reluctor tooth (5)





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 J7872.
1. Mount the camshaft in V-blocks between the centers.
2. Use the J7872 in order to measure the intermediate camshaft journal.

5. Measure the camshaft lobe lift using the J7872.
0. Lubricate the camshaft using GM P/N United States 12345501, GM P/N Canada 992704 or the equivalent.
1. Set the camshaft on V-blocks.
2. Use the J7872 in order to measure the lobe lift.

6. If the runout or lobe lift is not within specifications, replace the camshaft.