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 camshaftt 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 90 degrees apart. Refer to Engine Mechanical Specifications (L65) or Engine Mechanical Specifications (L57 P32/42).
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 theJ 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.