CAMSHAFT AND TAPPETS

Camshaft and tappets - remove

1. Remove rocker shaft assemblies.
2. Remove pushrods and store in fitted order.
3. Remove timing chain and gears.
4. Remove tappets and retain with their respective pushrods.

NOTE: If tappets cannot be removed due to damaged camshaft contact area, proceed as follows:

5. Lift tappets in pairs to the point where damaged face is about to enter tappet bore and fit rubber bands to retain tappets. Repeat
until all tappets are retained clear of camshaft lobes. The tappets can then be withdrawn out the bottom of their bores when the sump is
removed.

6. Withdraw camshaft, taking care not to damage bearings in cylinder block.

 

 

Camshaft and tappets - inspection

1. Throughly clean all components.
2. Inspect camshaft bearing journals and lobes for signs of wear, pitting, scoring and overheating.
3. Support camshaft front and rear bearings on vee blocks, and using a DTI, measure camshaft run-out on centre bearing. Maximum permitted run-out = 0.05 mm.
4. Clean and inspect tappets. Check for an even, circular wear pattern on the camshaft contact area. If contact area is pitted or a square wear pattern has developed, tappet must be renewed.
5. Inspect tappet body for excessive wear or scoring. Replace tappet if scoring or deep wear patterns extend up to oil feed area. Clean and
inspect tappet bores in engine block.
6. Ensure that tappets rotate freely in their respective bores.
7. Inspect pushrod contact area of tappet, replace tappet if surface is rough or pitted.