Land Rover V8 engine 4.0, 4.6 litre. Manual — part 15
ENGINE
42
OVERHAUL
Knock sensor - remove
1. Remove knock sensor from cylinder block.
Crankshaft position sensor - remove
1. Remove 2 bolts securing crankshaft position
sensor to gearbox adaptor plate, remove
sensor; collect spacer - if fitted.
ENGINE
OVERHAUL
43
Crankshaft - inspection
1. Clean crankshaft and blow out oil passages.
2. Support crankshaft front and rear bearing
journals on vee blocks, and using a DTI,
measure run-out on centre main bearing.
Maximum permitted run-out = 0.08 mm (0.003
in).
If run-out exceeds permitted maximum,
crankshaft is unsuitable for regrinding and
should be replaced.
3. Measure each journal for overall wear and
ovality, take 3 measurements at 120
°
intervals
at each end and centre of journals.
Main bearing journal diameter = 63.487 to
63.500 mm (2.499 to 2.52 in)
Maximum out of round = 0.040 mm (0.002 in).
Big-end bearing journal diameter = 55.500 to
55.513 mm (2.20 to 2.22 in)
Maximum out of round = 0.040 mm (0.002 in).
If measurements exceed permitted maximum,
regrind or fit new crankshaft.
NOTE: Ovality checks should be made at
120
°
intervals around each journal.
Crankshaft main and big-end bearings are
available in 0.254 mm (0.01 in) and 0.508 mm
(0.02 in) oversizes.
ENGINE
44
OVERHAUL
Crankshaft dimensions:
Bearing journal radius - all journals except rear main
journal A = 1.90 to 2.28 mm (0.075 to 0.09 in).
Rear main bearing journal radius B = 3.04 mm (0.12
in).
Bearing journal diameter C:
Standard = 63.487 to 63.500 mm (2.499 to 2.52 in).
0.254 mm (0.01 in) undersize = 63.233 to 63.246
mm (2.511 to 2.512 in).
0.508 mm (0.02 in) undersize = 62.979 to 62.992
mm (2.509 to 2.510 in).
Bearing journal width D:
Standard = 26.975 to 27.026 mm (1.061 to 1.064 in).
Bearing journal diameter E:
Standard = 55.500 to 55.513 mm (2.20 to 2.22 in).
0.254 mm (0.01 in) undersize = 55.246 to 55.259
mm (2.17 to 2.18 in).
0.508 mm (0.02 in) undersize = 54.992 to 55.005
mm (2.16 to 2.165 in).
CAUTION: if crankshaft is to be replaced,
ensure replacement is correct for engine
being overhauled. Crankshafts are not
interchangeable between 4.0 and 4.6 litre
engines.
1. Check crankshaft spigot bearing for wear,
renew if necessary.
Crankshaft spigot bearing - renew
1. Carefully extract old spigot bearing.
2. Clean bearing recess in crankshaft.
3. Fit new bearing flush with, or to a maximum of
1.6 mm (0.06 in) below end face of crankshaft.
4. Ream bearing to correct inside diameter.
Spigot bearing inside diameter = 19.177 +
0.025 - 0.000 mm (0.75 + 0.001 - 0.000 in).
5. Remove all traces of swarf.
ENGINE
OVERHAUL
45
Crankshaft - refit
1. Clean main bearing caps, bearing shell
recesses and mating surfaces of cylinder
block.
CAUTION: Ensure bolt holes in cylinder
block and main bearing caps are clean
and dry.
2. Fit new upper main bearing shells, with oil
holes and grooves, in cylinder block, ensuring
flanged shell is fitted in centre position.
NOTE: If crankshaft has been reground
ensure appropriate oversize bearing shells
are fitted.
3. Lubricate main bearing shells with engine oil
and position crankshaft in cylinder block.
4. Fit new main bearing shells to bearing caps.
5. Lubricate main bearing shells with engine oil.
6. Fit numbers 1 to 4 main bearing caps ensuring
that reference marks made during dismantling
are aligned, fit and tighten main bearing cap
bolts to 5 Nm (4 lbf.ft).
NOTE: Do not fit side bolts at this stage.
7. Fit side seals to rear main bearing cap.
CAUTION: Seals must protrude
approximately 1.5 mm (0.05 in) above
bearing cap face.
8. Apply a 3 mm (0.12 in) wide bead of Hylomar
PL32 jointing compound to bearing cap rear
mating face on cylinder block.
CAUTION: Ensure sealant does not enter
bolt holes.
9. Lubricate rear main bearing shell and side
seals with engine oil, carefully fit rear main
bearing cap assembly; fit and tighten main
bearing cap bolts to 5 Nm (4 lbf.ft).
CAUTION: Ensure that engine oil does not
enter side bolt holes in bearing cap.
10. Smear new Dowty washers with engine oil and
fit to main bearing cap side bolts.
11. Fit and tighten RH then LH side bolts to 5 Nm
(4 lbf.ft) ensuring that socket head cap bolt is
fitted to rear main bearing cap on RH side of
cylinder block adjacent to starter motor
aperture.
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