Discovery I (LJ) V8-4.0L (1996)
Lifter / Lash Adjuster: Testing and Inspection
Camshaft and Tappets Inspection
1. Thoroughly 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 V-blocks, and using a DTI (Dial Indicator), measure camshaft run-out on center bearing.
Maximum permitted run-out: 0.05 mm
4. Inspect thrust plate 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 cylinder block.
7. Ensure that tappets rotate freely in their respective bores.
8. Inspect pushrod contact area of tappet, replace tappet if surface is rough or pitted.