Land Rover V8 engine 4.0, 4.6 litre. Manual — part 5
ENGINE
2
OVERHAUL
Rocker shafts - dismantling
1. Remove and discard split pin from one end of
rocker shaft.
2. Remove plain washer, wave washer, rocker
arms, brackets and springs.
Inspecting components
1. Thoroughly clean components.
2. Inspect each component for wear, in particular
rocker arms and shafts. Discard weak or
broken springs.
3. Inspect pushrod seats in rocker arms.
4. Check pushrods for straightness and inspect
ball ends for damage, replace as necessary.
ENGINE
OVERHAUL
3
Rocker shafts - assembling
1. Assemble rocker shafts with identification
groove at one o’clock position with push rod
end of rocker arm to the right.
CAUTION: Incorrect assembly of rocker
shafts will lead to an oil feed restriction.
2. Fit new split pin to one end of rocker shaft.
3. Fit plain washer and wave washer.
4. Lubricate rocker arm bushes with engine oil.
5. Fit rocker arms with offsets as illustrated.
6. Assemble rocker arms, brackets and springs to
rocker shaft.
7. Compress springs, fit wave washer, plain
washer and secure with new split pin.
Rocker shafts - refit
1. Lubricate pushrods with engine oil.
2. Fit pushrods in removed order.
3. Fit each rocker shaft assembly, ensuring
identification groove is uppermost and towards
front of engine on RH side and towards rear of
engine on LH side.
CAUTION: Incorrect fitment of rocker
shafts will lead to an oil feed restriction.
4. Fit bolts and starting at centre brackets, tighten
to 38 Nm (28 lbf.ft).
ENGINE
4
OVERHAUL
5. Clean gasket surface in rocker cover.
NOTE: Gaskets fitted to early engines
were manufactured from cork whilst those
fitted to later engines are manufactured
from rubber. The later type gaskets should be
fitted as replacements to all engines. Cork
gaskets were retained by an adhesive whereas
rubber gaskets do not need an adhesive. If cork
gaskets were originally fitted, remove all traces
of adhesive using Bostik Cleaner 6001 or
equivalent.
6. Fit new gasket, dry to rocker cover.
7. Fit rocker cover to cylinder head, fit bolts and
tighten in diagonal sequence to:
Stage 1 - 4 Nm (3 lbf.ft)
Stage 2 - 8 Nm (6 lbf.ft)
Stage 3 - Re-torque to 8 Nm (6 lbf.ft)
CAUTION: The 2 short bolts must be fitted
on side of cover nearest centre of engine.
8.
LH rocker shaft only: Align dipstick tube to
rocker cover, fit and tighten screw.
CYLINDER HEAD
Cylinder head - remove
1. Remove rocker shaft assembly.
2. Mark heads LH and RH for reassembly.
NOTE: RH cylinder head illustrated.
3. Using sequence shown, remove and discard
10 bolts securing cylinder head to cylinder
block.
4. Release cylinder head from 2 dowels and
remove cylinder head.
5. Remove and discard cylinder head gasket.
6. Repeat above procedures for remaining
cylinder head.
ENGINE
OVERHAUL
5
Valves and springs - remove
1. Remove spark plugs.
2. Using valve spring compressor LRT-12-034 or
a suitable alternative, compress valve spring.
3. Compress valve spring sufficiently to release
collets from valve spring cap.
4. Release spring compressor and remove
collets, valve, valve spring cap and valve
spring.
5. Repeat above operations for remaining valves.
NOTE: Keep valves, springs, caps and
collets in fitted order.
6. Remove and discard valve stem oil seals.
Cylinder head - inspection
1. Clean all traces of gasket material from
cylinder head using a plastic scraper.
2. Check core plugs for signs of leakage and
corrosion, replace as necessary. Apply Loctite
572 to threads of screwed core plugs.
3. Check gasket face of each cylinder head for
warping, across centre and from corner to
corner.
Maximum warp = 0.05 mm (0.002 in)
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