44. Camshaft and Bearings Cleaning and Inspection

Camshaft and Bearings Cleaning and Inspection

Tools Required

J 7872 Magnetic Base Dial Indicator

1. Clean the camshaft with cleaning solvent.




Caution: Refer to Cleaning Solvent Caution.

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 J 7872 .
1. Mount the camshaft in V-blocks between the centers.
2. Use the J 7872 in order to measure the intermediate camshaft journal.
5. Measure the camshaft lobe lift using the J 7872 .
1. Lubricate the camshaft using GM P/N United States 12345501, GM P/N Canada 992704 or the equivalent.
2. Set the camshaft on V-blocks.
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.