Procedures

INSPECTION

Camshaft

CAUTION: If Camshaft lobes are worn, requiring camshaft replacement, it is necessary to replace the tappets also. Valve Tappet(s) - Removal .





1. Inspect the valve lobes (1) and bearing journals (2) for cracks, pitting, scoring or excessive wear. Replace any camshaft that exceeds the allowable limits.
2. Measure the bearing journals and lobes.

CAMSHAFT DIMENSIONS






Camshaft Bushing/Bores





Camshaft bores No. 2-6 do not use a bushing.

1. Inspect the camshaft bushing and bores for signs of excessive wear.
2. Measure the camshaft bushing and bores with a telescoping bore gauge and micrometer. If out of specification Camshaft - Removal.





3. Inspect the camshaft bushing (1) oil holes for alignment with cylinder block.

Camshaft Gear

Inspect the camshaft gear for cracks (gear and hub) and chipped/broken/fretted teeth. If replacement is necessary, camshaft and gear are replaced as an assembly Camshaft - Removal.

Thrust Plate





Inspect the camshaft thrust plate (1) for excessive wear in the camshaft contact area. Measure thrust plate thickness. Replace any thrust plate that falls outside of the allowable limits.

CAMSHAFT THRUST PLATE THICKNESS