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

ENGINE
12
OVERHAUL
4.Using suitable piloted cutters, cut valve seats
to the following dimensions:
Valve seat:
WidthA:
Inlet = 36.83 mm (1.45 in)
Exhaust = 31.50 mm (1.24 in)
Seating widthB:
Inlet = 0.89 to 1.4 mm (0.035 to 0.055 in)
Exhaust = 1.32 to 1.83 mm (0.052 to 0.072 in)
AngleC=56°to 70°
AngleD:
Up to ’99 Model Year = 46°to 46°25’
’99 Model Year onwards = 45°to 45°30’
AngleE=20°Valves - lapping-in
1.Lap each valve to its seat using fine grinding
paste.
2.Clean valve and seat.
3.Coat valve seat...

ENGINE
OVERHAUL13
Engines fitted with secondary air injection (SAI)
1.Using a 5/8 in x 20 TPI (threads per inch) UNF
tap having a class 2A thread, remove deposits
from secondary air injection adapter tappings
in cylinder head.
CAUTION: Ensure that tap used has 20
TPI.Valves and springs - refit
1.Fit new valve stem oil seals, lubricate valve
stems, fit valves, valve springs and caps,
compress valve springs usingLRT-12-034
and fit collets.
2.Using a wooden dowel and mallet, lightly tap
each valve stem two...

ENGINE
14
OVERHAUL Cylinder head - refit
1.Clean cylinder block and cylinder head faces
using suitable gasket removal spray and a
plastic scraper.
2.Ensure that bolt holes in cylinder block are
clean and dry.
CAUTION: Do not use metal scraper or
machined surfaces may be damaged.
3.Fit cylinder head gasket with the word’TOP’
uppermost.
NOTE: Gasket must be fitted dry.
4.Carefully fit cylinder head and locate on
dowels.
5.Lightly oil threads of new cylinder head bolts.
NOTE: RH cylinder head illustrated....

ENGINE
OVERHAUL15
TIMING CHAIN AND GEARS
Sump - remove
1.Remove dipstick.
NOTE: Sump fitted to early engines
illustrated
2.Remove 14 bolts and 3 nuts securing sump to
cylinder block and timing cover.
3.Taking care not to damage sealing faces,
carefully release sump from timing cover and
cylinder block.
4.Remove sump, remove and discard gasket - if
fitted.Timing cover - remove
NOTE: Timing cover, oil pump, oil
pressure by-pass valve and oil pressure
relief valve are only supplied as an
assembly.
1.Secure...

ENGINE
16
OVERHAUL
6.Remove 2 bolts securing oil pick-up pipe to oil
pump cover, withdraw pipe from cover; remove
and discard’O’ring.
7.Remove oil pick-up pipe, recover spacer from
stud.
8.Remove bolt securing camshaft sensor to
timing cover, withdraw sensor; remove and
discard’O’ring.
9.Release harness connector from mounting
bracket.
NOTE: New Range Rover timing cover
illustrated.
10.Noting their fitted position, remove 9 bolts
securing timing cover to cylinder block; remove
cover; collect camshaft...

ENGINE
OVERHAUL17
Timing gears - remove
1.Restrain camshaft gear and remove bolt
securing gear.
2.Remove timing chain and gears as an
assembly.
3.Collect Woodruff key from crankshaft.Timing chain and gears - inspection
1.Thoroughly clean all components.
2.Inspect timing chain links and pins for wear.
3.Inspect timing chain gears for wear. Replace
components as necessary. 

ENGINE
18
OVERHAUL Timing gears - refit
1.Clean gear locations on camshaft and
crankshaft, fit Woodruff key to crankshaft.
2.Temporarily fit crankshaft gear and if
necessary, turn crankshaft to bring timing mark
on gear to the twelve o’clock position, remove
gear.
3.Temporarily fit camshaft gear.
4.Turn camshaft until mark on camshaft sprocket
is at the six o’clock position, remove gear
without moving camshaft.
5.Position timing gears on work surface with
timing marks aligned.
6.Fit timing chain around...

ENGINE
OVERHAUL19
Timing cover - refit
NOTE: Timing cover, oil pump, oil
pressure by-pass valve and oil pressure
relief valve are only supplied as an
assembly.
1.Clean sealant from threads of timing cover
bolts.
2.Clean all traces of gasket material from mating
faces of timing cover and cylinder block,
ensure bolt holes are clean and dry.
CAUTION: Use a plastic scraper.
3.Clean oil seal location in timing cover.
4.Position new gasket, fitted dry, to timing cover
locating dowels.
5.Position oil pump drive...

ENGINE
20
OVERHAUL
A- Early type seal
B- Later type seal - use as replacement on all
engines
CAUTION: Replacement oil seal is
pre-greased, do not use any additional
lubricant.
12.Fit timing cover oil seal using toolLRT-12-089.
13.Smear a new’O’ring with engine oil and fit to
oil pick-up pipe.
14.Position oil pick-up pipe spacer on number 4
main bearing cap stud.
15.Fit oil pick-up pipe ensuring that end of pipe is
correctly inserted in oil pump body.
16.Fit oil pick-up pipe to oil pump body bolts and...

ENGINE
OVERHAUL21
Sump - refit
Early engines fitted with pressed steel sump
1.Remove all traces of old sealant from mating
faces of cylinder block and sump, ensure bolt
holes are clean and dry.
2.Apply a bead of sealant, Part number STC
50550 to sump joint face as shown:
Bead width - areas A, B, C and D = 12 mm (0.5
in)
Bead width - remaining areas = 5 mm (0.20 in)
Bead length - areas A and B = 32 mm (1.23 in)
Bead length - areas C and D = 19 mm (0.75 in)
CAUTION: Do not spread sealant bead.
Sump must be...