Land Rover V8 engine 4.0, 4.6 litre. Manual — part 10
ENGINE
22
OVERHAUL
Oil pump - inspection
1. Thoroughly clean oil pump drive gear, cover
plate, rotors and housing. Remove all traces of
Loctite from cover plate securing screws;
ensure tapped holes in timing cover are clean
and free from oil.
2. Check mating surfaces of cover plate, rotors
and housing for scoring.
3. Assemble rotors and oil pump drive gear in
housing ensuring that reference marks are
aligned.
4. Using feeler gauges, check clearance between
teeth of inner and outer rotors:
Maximum clearance = 0.25 mm (0.01 in)
5. Remove oil pump drive gear, check depth of
any wear steps on gear teeth:
Wear step maximum depth = 0.15 in (0.006 in)
6. Place a straight edge across housing.
7. Using feeler gauges, check clearance between
straight edge and rotors:
Maximum clearance = 0.1 mm (0.004 in).
ENGINE
OVERHAUL
23
Oil pressure relief valve - inspection
1. Clean relief valve components and piston bore
in timing cover.
2. Check piston and bore for scoring and that
piston slides freely in bore with no perceptible
side movement.
3. Check relief valve spring for damage and
distortion; check spring free length:
Spring free length = 60.0 mm (2.4 in).
Oil pump - refit
1. Lubricate rotors, oil pump drive gear, cover
plate and housing with engine oil.
2. Assemble rotors and drive gear in housing
ensuring that reference marks are aligned.
3. Position cover plate to housing.
4. Apply Loctite 222 to threads of cover plate
screws and bolt.
5. Fit cover plate screws and bolt and tighten to:-
Screws - 4 Nm (3 lbf.ft)
Bolt - 8 Nm (6 lbf.ft)
6. Fit timing cover.
ENGINE
24
OVERHAUL
Oil pressure relief valve - refit
1. Lubricate new ’O’ ring with engine oil and fit to
relief valve plug.
2. Lubricate relief valve spring, piston and piston
bore with engine oil.
3. Assemble piston to relief valve spring, insert
piston and spring into piston bore.
4. Fit relief valve plug, depress plug and fit circlip.
5. Ensure circlip is fully seated in groove.
CAMSHAFT AND TAPPETS
Camshaft end-float - check
1. Remove rocker shaft assemblies.
2. Remove pushrods and store in their fitted
order.
3. Remove timing chain and gears.
4. Temporarily fit camshaft gear bolt.
5. Attach a suitable DTI to front of cylinder block
with stylus of gauge contacting end of
camshaft.
6. Push camshaft rearwards and zero gauge.
7. Using camshaft gear bolt, pull camshaft
forwards and note end-float reading on gauge.
End-float = 0.05 to 0.35 mm (0.002 to 0.014 in)
8. If end-float is incorrect, fit a new thrust plate
and re-check. If end-float is still incorrect, a
new camshaft must be fitted.
ENGINE
OVERHAUL
25
Camshaft and tappets - remove
1. Remove tappets and retain with their
respective pushrods.
2. When tappets prove difficult to remove due to
damaged camshaft contact area, proceed as
follows. 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 and
camshaft are removed.
3. Remove 2 bolts securing camshaft thrust plate
to cylinder block, remove plate.
4. Withdraw camshaft, taking care not to damage
bearings in cylinder block.
NOTE: Camshafts fitted to 4.0 litre engines
are colour coded ORANGE whilst those
fitted to 4.6 litre engines are colour coded
RED.
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