ECU LAND ROVER DISCOVERY 1995 Repair Manual

12ENGINE
12
REPAIR
12.Remove 4 bolts securing rocker cover to cylinder
head.
13.Remove rocker cover.
14.Remove and discard rocker cover gasket.Refit
15.Clean mating faces between rocker cover and
cylinder head using Bostick cleaner 6001 or
equivalent. Allow to dry.
NOTE: Gasket fits one way round only. It
must be fitted accurately, first time.
Subsequent movement will destroy
bonding.
16.Apply a thin coating of impact adhesive (Bostick
1775 or equivalent) to mating faces of rocker
cover seal face and new gasket. Use a brush to
ensure an even film. Allow adhesive to become
touch dry.
17.Place one end of gasket into cover recess with
edge firmly against recess wall, holding
remainder of gasket clear. Work around cover,
pressing gasket into place ensuring edge firmly
contacts recess wall.
CAUTION: Allow cover to stand for thirty
minutes before fitting.
18.Fit rocker cover to cylinder head, ensure short
screws are inboard. Tighten to
9 Nm.
19.Connect fuel feed and return hoses.
20.Refit ht leads into retaining brackets.
21.Secure engine harness to brackets.
22.Connect coolant pipes to hoses and secure
brackets.
23.Connect breather hose to rocker cover.
24.Connect purge hose to plenum chamber.
25.Connect bottom hose to radiator.
26.Refill cooling system.
See COOLING SYSTEM
V8, Adjustment, Coolant
27.Reconnect battery negative lead.

12ENGINE
2
DESCRIPTION AND OPERATION The aluminium alloy, tin coated pistons have two
compression and an oil control ring and are secured
to the connecting rods by semi-floating gudgeon pins
which are an interference fit in the small-end bush.
Gudgeon pins are offset towards the thrust side of the
pistons to reduce frictional drag.
Plain, big-end bearing shells are fitted to each
connecting rod.The internally toothed timing belt is driven from a gear
which is keyed to the crankshaft, belt tension being
controlled by a semi-automatic tensioner.
The trochoidal type oil pump is mounted on the front
of the engine and carries the crankshaft front oil seal.
Drive to the pump is via a Woodruff key inserted in the
crankshaft.

12ENGINE
2
REPAIR 13.Remove 2 bolts securing camshaft gears to
camshafts.
14.Remove tool LRT-12-060.
CAUTION: Do not rotate camshafts.
15.Remove gears noting the 'IN' and 'EXHAUST'
identifying marks.
16.Remove 5 bolts securing timing belt upper
backplate.
17.Remove belt upper backplate.
18.Remove seals using tool LRT-12-063 fit
thrustpad as shown.
Refit
1.Clean sealing area of cylinder head and
camshaft, ensure all traces of rubber are
removed - do not scrape.
2.Using tool LRT-12-064 and LRT-12-072 fit new
camshaft oil seals.
CAUTION: Ensure sealing lip of seal is not
distorted.

Mpi
5
REPAIR CRANKSHAFT REAR OIL SEAL
Service repair no - 12.21.20
Remove
1.Remove gearbox.
2.Remove clutch assembly.
3.Remove flywheel.
4.Drain engine oil.
5.Fit sump plug, replacing sealing washer if
damaged and tighten to the correct torque.
6.Loosen 15 sump bolts by approximately 3 turns,
allowing sump to drop away from rear oil seal
housing. Do not loosen 3 boltsAaround oil
pump housing.
7.Remove bolts securing oil seal housing, remove
seal and housing assembly.
Refit
1.Clean seal seating area of block and accessible
area of sump gasket. Sump gasket must be
replaced if damaged.
2.Lubricate oil seal sealing surfaces with engine
oil.
3.Fit tool LRT-12-061 over crankshaft boss and fit
oil seal and housing assembly.
4.Remove tool.
5.Fit and tighten seal housing bolts to correct
torque in sequence shown.
10Nm
6.Tighten sump bolts to correct torque and in the
correct sequence.
See Engine Sump Gasket
7.Fit flywheel.
8.Fit clutch assembly.
9.Fit gearbox.

Mpi
7
REPAIR
NOTE: On current models the generator
cover is omitted.
9.Remove 3 nuts securing generator rear cover.
10.Remove rear cover.
11.Remove 3 nuts securing harness to generator.
12.Remove harness.
13.Disconnect oxygen sensor multiplug.
14.Release multiplug from bracket.
15.Release harness from cable tie.
16.Disconnect 2 coolant temperature sensor
multiplugs.
17.Release clips and disconnect the bypass and
top hose.
18.Release harness lead from cable tie.
19.Release clip and disconnect breather hose from
inlet manifold.
20.Feed harness between inlet manifold and cam
cover.

Mpi
9
REPAIR 29.Disconnect oil pressure switch multiplug.
30.Disconnect air conditioning compressor
multiplug.
31.Remove 3 bolts securing engine harness to
manifold and fuel pipe.
32.Disconnect knock sensor multiplug.
33.Remove 2 nuts securing harness to starter motor
solenoid, remove harness.
34.Disconnect crankshaft sensor multiplug.
35.Disconnect fuel injection harness multiplug.
36.Disconnect inlet manifold air temperature sensor
multiplug.
37.Release clip and disconnect fuel hose from
pressure regulator.
CAUTION: Plug the connections.

12ENGINE
10
REPAIR
38.Disconnect 2 ignition coil multiplugs.
39.Disconnect 3 vacuum hoses from manifold.
40.Release cover and remove bolt securing earth
lead to cylinder block.
41.Move earth lead aside.
42.Remove 4 bolts securing air conditioning
compressor, move compressor aside.

Mpi
11
REPAIR 43.Remove engine mounting heat shield. Remove
upper nuts from engine L.H. and R.H.
mountings.
44.Release 4 screws and remove spark plug cover.
45.Fit tool LRT-12-056, support engine using
suitable hoist.
46.Raise vehicle.
47.Loosen 2 nuts securing downpipe to silencer.
48.Remove 4 nuts securing downpipe to exhaust
manifold.
49.Release downpipe from exhaust manifold.
50.Collect gasket.

12ENGINE
12
REPAIR 51.Remove engine L.H. and R.H. mounting lower
nuts.
52.Lower vehicle.
53.Raise engine.
54.Remove engine mountings.
55.Lower engine.
56.Remove bell housing top nut.
57.Raise engine and support gearbox.58.Remove 12 remaining bell housing nuts.
59.Remove engine.
Refit
NOTE: For torque values.See
Specifications, torque, Torque Values
1.Using assistance, lower engine into position.
2.Fit bell housing nuts, tighten to the correct
torque.
3.Remove gearbox support.
4.Lower engine.
5.Fit bell housing top nut, tighten to the correct
torque.
6.Raise engine.
7.Position engine mountings, partially tighten nuts.
8.Lower engine.
9.Remove hoist and chains.
10.Tighten L.H. and R.H. mounting nuts to the
correct torque. Fit engine mounting heatshield.
11.Fit new gasket to exhaust downpipe.
12.Fit exhaust manifold to downpipe nuts and
tighten to the correct torque.
13.Tighten exhaust downpipe to silencer box nuts
to the correct torque.
14.Position air conditioning compressor and secure
with bolts. Tighten to the correct torque.
15.Connect coil multiplugs.
16.Connect harness to starter solenoid and secure
with nuts.
17.Connect earth lead to cylinder block and secure
with nut.
18.Position engine harness to manifold, secure with
bolts.

Mpi
13
REPAIR 19.Connect crankshaft sensor, knock sensor, air
conditioning compressor, fuel injector harness,
inlet manifold air temperature and fuel
temperature sensor multiplugs.
20.Connect fuel hose to pressure regulator and
secure with clip.
21.Fit and tighten fuel pipe to fuel rail union.
22.Connect multiplugs to throttle housing.
23.Connect vacuum hose to manifold.
24.Connect oil pressure switch multiplug.
25.Connect brake servo hose to manifold, secure
with clip.
26.Connect throttle cable to cam.
27.Position engine harness and connect breather
hose to inlet manifold, secure with clip.
28.Connect coolant temperature sensor multiplugs,
secure harness with cable tie.
29.Connect oxygen sensor multiplug, secure
harness with cable tie.
30.Connect alternator harness.
31.Connect heater hose to heater rail and secure
with clip.
32.Connect hose to coolant pump and secure with
clip.
33.Connect inlet hose to power steering pump and
secure with clip.
34.Fit and tighten outlet pipe union to power
steering pump.
35.Connect bypass and top hose, secure with clip.
36.Connect air cleaner to throttle housing hose and
secure with clip.
37.Remove engine lifting bracket.
38.Position spark plug cover and secure with
screws.
39.Fill engine with oil.
40.Fit bonnet [hood].
See CHASSIS AND BODY,
Repair, Bonnet [Hood]
41.Fit radiator.See COOLING SYSTEM, Repair,
Radiator - Mpi
42.Adjust throttle cable.See FUEL SYSTEM,
Adjustment, Throttle Cable Adjustment
ENGINE SUMP GASKET
Service repair no - 12.60.43
Remove
1.Drain engine oil.
2.Refit drain plug, use new sealing washer if
necessary, tighten to the correct torque.
3.Remove 18 bolts securing sump.
NOTE: 25mm long bolt is fitted at rear L.H.
corner of sump.
4.Release sump from cylinder block.
5.Discard gasket.