Inspecting Camshaft and Tappets for V8 Engine Overhaul
ENGINE
34
OVERHAUL
3. Remove 2 bolts securing camshaft thrust plate
- if fitted to cylinder block, remove plate.
4. 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 (0.002
in).
4. Inspect camshaft thrust plate - if fitted, for
wear, replace plate if wear is evident.
5. 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.
6. 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.
7. Ensure that tappets rotate freely in their
respective bores.
8. Inspect push rod contact area of tappet,
replace tappet if surface is rough or pitted.
