1999 GM 6.5L V8 – Camshaft and Bearings Clean and Inspect

Tools Required
J 7872 Magnetic Base Dial Indicator

1. Using a soft cloth and clean solvent, clean the camshaft. Do not scratch the camshaft bearing journals or lobes.
Caution: Wear safety glasses in order to avoid eye damage.

2. Using compressed air, dry the camshaft.

3. Using a soft cloth and clean solvent, clean the camshaft bearing inserts. Do not scratch the camshaft bearing inserts.

4. Inspect the camshaft for cracks using the Magnaflux Spot-check dye method or the equivalent.

5. Inspect the camshaft bearing journals for the following conditions:
• Scoring (1)
• Nicks (1)
• Worn camshaft lobes (2)
• Damaged sprocket bolt threads (3)
• Damaged sprocket pin (4)
• Damage caused by lack of lubrication

6. Inspect the camshaft bearing inserts for the following conditions:
• Scoring
• Nicks
• Damage caused by lack of lubrication

7. Inspect the camshaft retainer plate for damage.

8. Using a suitable measuring device, measure the camshaft journal diameter and taper in several places, approximately 9 0 degrees apart. Refer to Engine Mechanical Specifications (L65) or Engine Mechanical Specification s (L57 P 32/42).

9. Measure for a bent camshaft or excessive camshaft runout using J 7872.
9.1. Mount the camshaft in V-blocks at camshaft journals one and five.
9.2. Using the J 7872 Magnetic Base Dial Indicator, measure camshaft journal runout at camshaft journal three. Refer to Engine Mechanical Specifications (L65) or Engine Mechanical Specifications (L57 P32/42).

10. Replace the camshaft if runout exceeds specifications.

 

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