Land Rover 4 0 4 6 V8 Engine Overhaul 4th Edition Rover Manual

ENGINE
22
OVERHAUL 9.Fit sump drain plug and tighten to 45 Nm (33
lbf.ft).
10.Fit dipstick.Later engines fitted with cast alloy sump
1.Remove all traces of gasket and sealant from
the sump and cylinder block using a plastic
scraper. Ensure bolt holes in cylinder block are
clean and dry.
2.Apply a 5 mm (0.2 in) wide bead of sealant,
Part number STC 50550 across the cylinder
block to front cover joint and cylinder block to
rear main bearing cap joints. Apply a globule of
the sealant to the ends of the...

ENGINE
OVERHAUL23
5.Noting that the two parts of the tool are
’handed’, fit toolLRT-12-183to the engine
backplate using slave bolts.
6.Secure the tool to the sump using the bolts
which are part of the tool.
NOTE: The holes in the tool are larger than
the diameter of the bolts in order to allow
the sump to move as the sump bolts are
tightened.
7.Fit sump bolts and using the sequence shown
tighten to 22 Nm (16 lbf.ft).
8.Remove toolLRT-12-183.9.Fit sump drain plug and sealing washer, tighten
drain plug to...

ENGINE
24
OVERHAUL OIL PUMP
NOTE: Overhaul procedures for the oil
pump, oil pressure by-pass and relief
valves are limited to carrying out
dimensional checks. In the event of wear or
damage being found, a replacement timing cover
and oil pump assembly must be fitted.
Oil pump - remove
1.Remove timing cover.
CAUTION: Do not attempt to remove oil
pump drive gear from inner rotor at this
stage.
2.Remove 7 screws and bolt securing oil pump
cover plate, remove plate.
3.Make suitable alignment marks on inner...

ENGINE
OVERHAUL25
Oil pressure by-pass valve - remove
1.Remove circlip.
2.Remove by-pass valve plug.
3.Remove and discard’O’ring from plug.
4.Remove by-pass valve spring and plunger.
5.Check plunger and bore of by-pass valve in oil
pump body for scoring and corrosion.
NOTE: Light corrosion may be removed
using grade 600 emery cloth soaked in oil.Oil pressure relief valve - if fitted - remove
1.Remove circlip.
2.Remove relief valve plug.
3.Remove and discard’O’ring from plug.
4.Remove relief valve spring...

ENGINE
26
OVERHAUL Oil pump - inspection
1.Thoroughly clean oil pump drive gear, cover
plate, rotors and housing. Remove all traces of
sealant from threads of cover plate securing
screws and bolt; 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...

ENGINE
OVERHAUL27
Oil pressure by-pass valve - inspection
1.Clean by-pass valve components and plunger
bore in timing cover.
2.Check plunger and bore for scoring and that
plunger slides freely in bore with no perceptible
side movement.
3.Check by-pass valve spring for damage and
distortion; check spring free length:
Spring free length = 60.0 mm (2.4 in).Oil pressure relief valve - if fitted - inspection
1.Clean relief valve components and piston bore
in timing cover.
2.Check piston and bore for scoring...

ENGINE
28
OVERHAUL 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 sealant, Part number STC 50552 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.Oil pressure by-pass valve - refit
1.Lubricate new’O’ring with engine...

ENGINE
OVERHAUL29
Oil pressure relief valve if fitted - 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...

ENGINE
30
OVERHAUL Camshaft and tappets - remove
1.Remove tappets and retain with their
respective pushrods.
CAUTION: Store tappets upright to
prevent oil loss.
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...

ENGINE
OVERHAUL31
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
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 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...