1995 LAND ROVER DISCOVERY ECU

12ENGINE
10
REPAIR ROCKER COVER GASKET - LEFT HAND
Service repair no - 12.29.40 - LH Cover Gasket
Service repair no - 12.29.41 - RH Cover Gasket
Remove
1.Disconnect battery negative lead.
2.Remove plenum chamber.
See FUEL SYSTEM
SFI, Repair, Plenum Chamber
3.Remove screw securing dipstick tube to rocker
cover.
4.Release plug leads from guide clips and
disconnect from 4 spark plugs.
5.Remove 4 bolts securing rocker cover to cylinder
head.
6.Remove rocker cover.
7.Remove and discard rocker cover gasket.
Refit
8.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.
9.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.
10.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.
11.Fit rocker cover to cylinder head, ensure short
screws are inboard. Tighten to
9 Nm.
12.Connect leads to spark plugs and secure to
guide clips on rocker cover.
13.Secure dipstick tube to rocker cover.
14.Refit plenum chamber.
See FUEL SYSTEM
SFI, Repair, Plenum Chamber
15.Reconnect battery negative lead.

4.0 V8
11
REPAIR ROCKER COVER GASKET - RIGHT HAND
Service repair no - 12.29.41 - RH Cover Gasket
1.Depressurise fuel system.
See FUEL SYSTEM
SFI, Repair, Fuel System - Depressurise
2.Disconnect battery negative lead.3.Drain cooling system.
See COOLING SYSTEM
V8, Adjustment, Coolant
NOTE: Leave hose disconnected.
4.Disconnect purge pipe from plenum chamber
hose.
5.Disconnect breather pipe from rocker cover.
6.Remove bolt securing coolant pipe brackets and
nut securing bracket to manifold.
7.Loosen hose clip and disconnect coolant return
hose from pipe.
CAUTION: Plug connection.
8.Loosen clip and disconnect fuel return hose from
pipe.
9.Disconnect fuel hose from injector pipe.
CAUTION: Use 2 spanners.10.Remove 2 nuts securing engine harness
brackets to manifold.
11.Release 4 ht leads from 2 brackets on rocker
cover.

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.