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

ENGINE
42
OVERHAUL Later engines with modified’one-piece’starter
ring gear
1.Remove 4 bolts securing drive plate clamp
ring, remove clamp ring.
2.Remove drive plate.
3.Remove 6 Allen bolts securing starter ring gear
to crankshaft, remove ring gear.Drive plate and ring gear - inspection
1.Inspect drive plate for cracks and distortion.
2.Renew drive plate if necessary.
3.Inspect ring gear for worn, chipped and broken
teeth.
4.Renew ring gear assembly if necessary. 

ENGINE
OVERHAUL43
Drive plate and ring gear assembly - refit - Drive
plates fitted with shimmed hub aligner
CAUTION: To prevent distortion to drive
plate when bolted to torque converter,
drive plate setting height must be checked
as follows:
1.Ensure bolt holes in crankshaft are clean and
dry. Fit original selective shim and hub aligner,
fit Allen bolts and tighten to 85 Nm (63 lbf.ft).
2.Fit drive plate assembly and clamp ring
ensuring that reference marks are aligned; fit
bolts and tighten to 45 Nm (33...

ENGINE
44
OVERHAUL Drive plate and ring gear assembly - refit - Drive
plates with unshimmed hub aligner and later
engines fitted with modified’one-piece’starter
ring gear
NOTE: It is not necessary to check setting
height on drive plates fitted to the above
engines. On early engines, balance
weights are on engine side of drive plate;
replacement drive plates will have balance
weights on torque converter side.
Early engines with unshimmed hub aligner
1.Ensure bolt holes in crankshaft are clean and
dry. Fit...

ENGINE
OVERHAUL45
6.Remove 2 bolts securing each bearing cap.
7.Remove bearing cap and bearing shell.
NOTE: Keep bearing caps and bolts in
their fitted order.
8.Push each piston up its respective bore and
remove shells from connecting rods.
NOTE: Big-end bearing shells must be
replaced whenever they are removed.Big-end bearings - refit
1.Fit bearing shells to each connecting rod.
NOTE: Big-end bearings are available in
0.254 mm (0.01 in) and 0.508 mm (0.02 in)
oversizes.
2.Lubricate bearing shells and...

ENGINE
46
OVERHAUL
8.Check clearance between connecting rods on
each crankshaft journal.
Connecting rod clearance = 0.15 to 0.36 mm
(0.006 to 0.014 in).
9.Clean oil strainer and oil pick-up pipe.
10.Smear a new’O’ring with engine oil and fit to
oil pick-up pipe.
11.Position oil pick-up pipe spacer on number 4
main bearing cap stud.
12.Fit oil pick-up pipe ensuring that end of pipe is
correctly inserted in oil pump body.
13.Fit oil pick-up pipe to oil pump body bolts and
tighten to 8 Nm (6 lbf.ft).
14.Fit...

ENGINE
OVERHAUL47
9.Lift out crankshaft; remove and discard rear oil
seal.
10.Remove and discard 5 bearing shells from
cylinder block.
CAUTION: Main bearing shells must be
replaced whenever they are removed.
11.Remove and discard cruciform seals from rear
main bearing cap.
12.Remove all traces of sealant from bearing cap
and cylinder block.
13.Remove Woodruff key from crankshaft.Knock sensor - remove
1.Remove knock sensor from cylinder block. 

ENGINE
48
OVERHAUL Crankshaft position sensor - remove
1.Remove 2 bolts securing crankshaft position
sensor to gearbox adaptor plate, remove
sensor; collect spacer - if fitted.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...

ENGINE
OVERHAUL49
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...

ENGINE
50
OVERHAUL 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.Crankshaft - refit
1.Clean main bearing caps, bearing shell
recesses and mating surfaces of cylinder
block.
CAUTION: Ensure...

ENGINE
OVERHAUL51
7.Fit new cruciform seals to rear main bearing
cap.
CAUTION: Seals must protrude
approximately 1.5 mm (0.05 in) above
bearing cap face, do not trim off excess
material at this stage.
8.Apply a 3 mm (0.12 in) wide bead of sealant,
Part number STC 50550 to bearing cap rear
mating face on cylinder block.
CAUTION: Ensure sealant does not enter
bolt holes.
9.Lubricate rear main bearing shell and cruciform
seals with engine oil, carefully fit rear main
bearing cap assembly; fit and tighten...