1995 LAND ROVER DISCOVERY spark plugs

12ENGINE
6
REPAIR 11.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.
12.Allow cover to stand for thirty minutes before
fitting.
13.Fit rocker cover to cylinder head with four
screws, short screws inboard, tighten to
9 Nm.
14.Position fuel pipes.
15.Fit breather pipe to rocker cover, tighten clip.
16.Fit coolant pipes to inlet manifold, tighten bolts.
17.Fit spark plug leads to plugs and retaining clips.
18.Connect purge pipe from charcoal canister at
plenum, tighten clip.
ROCKER COVER - LEFT HAND - RENEW
Service repair no - 12.29.40
1.Remove air flow sensor.
See FUEL SYSTEM,
Repair, Air Flow Sensor
2.Remove plenum chamber.See FUEL SYSTEM,
Repair, Plenum Chamber
3.Remove dipstick.
4.Remove spark plug leads from plugs and
retaining clips.
5.Disconnect HT lead from coil.
6.Remove generator heat shield securing nut from
rocker cover.
7.Remove air flow meter harness clip.
8.Remove bolt securing dipstick tube clip.
9.Remove four rocker cover bolts, remove rocker
cover.
10.Discard gasket
11.Remove plug lead retaining clips from rocker
cover, fit to new rocker cover.
12.Clean and dry rocker cover and cylinder head
mating faces, using Bostik cleaner 6001.
NOTE: Gasket fits one way round only. It
must be fitted accurately, first time.
Subsequent movement will destroy
bonding.
13.Apply Bostik 1775 impact adhesive to rocker
cover seal face and gasket, using a brush to
ensure an even film. Allow adhesive to become
touch dry, approximately fifteen minutes.
14.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.
15.Allow cover to stand for thirty minutes before
fitting.
16.Fit rocker cover to cylinder head with four
screws, short screws inboard. Tighten to
9 Nm.
17.Position dipstick tube clip. Fit and tighten bolts.
18.Fit and tighten air flow meter harness clip.
19.Fit generator heat shield to rocker cover.
20.Connect HT lead to coil.
21.Connect spark plug leads to plugs and retaining
clips.
22.Fit dipstick.
23.Fit plenum chamber.
24.Fit air flow meter.

4.0 V8
3
REPAIR ENGINE ASSEMBLY
Service repair no - 12.41.01/99
Remove
1.Position vehicle on ramp.
2.Remove bonnet.
See CHASSIS AND BODY,Repair, Bonnet [Hood]
3.Remove radiator.See COOLING SYSTEM,
Repair, Radiator
4.Remove plenum chamber.See FUEL SYSTEM
SFI, Repair, Plenum Chamber
5.Remove mass air flow sensor.See FUEL
SYSTEM SFI, Repair, Mass Air Flow Sensor
(MAF Sensor)
6.Slacken hose clip securing bottom hose to
expansion tank.
7.Disconnect hose.
8.Remove 2 nuts securing expansion tank.
9.Remove nut and bolt securing expansion tank.
10.Remove expansion tank.
11.Disconnect servo vacuum hose from ram
housing.
12.Disconnect battery sensing lead Lucar from
generator.
13.Remove generator terminal cover.
14.Remove 2 terminal nuts and release leads from
terminals.
15.Release purge hose from ram pipe housing.
16.Position cloth to absorb fuel spillage.
17.Slacken clip securing fuel return hose to fuel rail.
18.Disconnect hose.
19.Plug connections.
20.Disconnect fuel feed hose union.
21.Plug connections. Position hoses aside.
22.Slacken clip securing heater return hose to pipe.
23.Disconnect hose.24.Slacken clip securing heater feed adaptor hose
to inlet manifold.
25.Remove bolt securing pipe bracket.
26.Disconnect feed hose from inlet manifold.
27.Disconnect hose/pipe assembly.
28.Disconnect leads from spark plugs and remove
ignition coils.
See FUEL SYSTEM SFI, Repair,
Ignition Coils
29.Disconnect fuel temperature sensor multiplug.
30.Disconnect coolant sensor multiplug.
31.Disconnect temperature gauge sensor lead.
32.Release camshaft sensor multiplug from bracket
and disconnect multiplug.
33.Disconnect oil pressure switch Lucar.
34.Disconnect air intake temperature sensor
multiplug.
35.Disconnect 8 injector multiplugs.
36.Remove 4 nuts securing harness brackets to
inlet manifold.
37.Release harness brackets.
38.Remove bolts securing gearbox breather pipes
to engine lifting bracket.

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.

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.

Mpi
17
REPAIR 22.Raise vehicle
23.Remove 4 nuts securing downpipe to exhaust
manifold.
24.Release downpipe from exhaust manifold.
25.Collect gasket.
26.Release 4 screws and remove spark plug cover.
27.Release spark plug leads from spark plugs and
release from clips. Place aside.
28.Remove camshaft covers.
29.Remove timing belt.
See Camshaft Front Oil
Seal
30.Progressively loosen and remove 10 cylinder
head bolts in sequence shown.
31.Remove cylinder head complete with manifold,
place on blocks to prevent damage.
32.Remove and discard cylinder head gasket.
33.Remove location dowels from cylinder block.
34.Inspect cylinder head for damage, cracks and
burning.
35.Inspect cylinder block. Ensure that the oil
restrictor is clear and fitted below the block face.
36.Clean all traces of gasket material from head
and block mating faces, using release agent and
plastic scraper.
37.Check cylinder head and block faces for
warpage:
Longitudinal warp = 0.1 mm max.
Transverse warp = 0.1 mm max.
Diagonal warp = 0.1 mm max.
38.Decarbonize cylinder head and pistons if
necessary.
39.Clean cylinder head bolt threads with a wire
brush, check for damage, replace if necessary.
40.Check cylinder block threads by running bolts
into threads using fingers only. Clean any tight
threads using M11 x 1.5 mm tap. Remove all
traces of oil from bolt holes.

12ENGINE
18
REPAIR Refit
1.Fit location dowels to cylinder head.
2.Fit cylinder head gasket to cylinder block.
3.Using assistance fit cylinder head to cylinder
block.
4.Lubricate cylinder head bolts.
5.Fit and tighten cylinder head bolts to the correct
torque and in the correct sequence.
NOTE: For torque values.See
Specifications, torque, Torque values
6.Fit timing belt.
7.Fit camshaft covers.
8.Fit spark plug leads to spark plugs and secure to
clips.
9.Fit spark plug cover and secure with screws.
10.Fit new gasket and secure downpipe to exhaust
manifold with nuts.
11.Fit bolt securing dipstick tube to coolant rail.
12.Connect 3 vacuum hoses to inlet manifold.
13.Connect fuel to pressure regulator, secure with
clip.
14.Connect fuel injection harness, inlet manifold air
temperature sensor and fuel temperature sensor
multiplugs.
15.Secure engine harness to manifold with bolts.
16.Connect brake servo hose to manifold, secure
with clip.
17.Connect air cleaner hose to throttle housing,
secure with clip.
18.Connect stepper motor and throttle
potentiometer multiplugs.
19.Fit and adjust throttle cable.
20.Connect oxygen sensor multiplug, secure with
cable tie.
21.Connect the bypass and top hose, secure with
clips.
22.Connect coolant temperature sensor multiplugs,
secure with cable tie.
23.Connect hose to heater rail and secure with clip.
24.Connect radiator bottom hose and secure with
clip.
25.Tighten fuel pipe to fuel rail union.
26.Reconnect battery negative lead.

Mpi
1
SPECIFICATIONS, TORQUE TORQUE VALUES
NOTE: Torque wrenches should be regularly checked for accuracy to ensure that all fixings are
tightened to the correct torque.
Nm
ENGINE
Timing belt upper cover bolts 5......................................................................
Timing belt centre cover bolts 5.....................................................................
Timing belt lower cover bolts 5......................................................................
Crankshaft pulley centre bolt 85.....................................................................
Crankshaft pulley to timing gear bolts 10........................................................
Tensioner pulley bolt 30..................................................................................
Spark plugs 27................................................................................................
Timing belt upper backplate bolts 10..............................................................
Camshaft gear bolts 65...................................................................................
Exhaust camshaft rear oil seal cover plate bolts 10........................................
Inlet camshaft rear oil seal cover plate bolts 10..............................................
Crankshaft rear oil seal housing bolts 10........................................................
Engine sump bolts
Stage 1 3...............................................................................................
Stage 2 10..............................................................................................
Bell housing nuts 40........................................................................................
L.H. and R.H. engine mounting nuts 85..........................................................
Exhaust manifold to downpipe nuts 10...........................................................
Exhaust downpipe to silencer box nuts 30......................................................
Air conditioning compressor to engine block bolts 45.....................................
Cylinder head bolts
Stage 1 45..............................................................................................
Stage 2 80..............................................................................................
Stage 3 - Further 90°
Camshaft cover bolts 10.................................................................................
Knock sensor 15.............................................................................................
Ignition coil bracket bolts 25............................................................................
Coolant temperature sensor 15......................................................................
Crankshaft sensor bolts 7..............................................................................
Fuel temperature sensor 7.............................................................................
Intake air temperature sensor 7.....................................................................
Fuel rail to inlet manifold bolts 10...................................................................
Fuel feed hose stiffening bracket bolts 7.......................................................
Throttle housing mounting nuts 7...................................................................
Fuel pressure regulator steady bracket bolts 7..............................................
Oxygen sensor 55...........................................................................................

MFI
1
FAULT DIAGNOSIS ENGINE TUNING
Circuit fault diagnosis may be carried out on all V8i
vehicles, using Testbook. Testbook will guide the
operator by visual prompts through a series of
diagnostic checks.
Before commencing any fault diagnosis, the following
preminary checks must be carried out.
Preliminary checks
CAUTION: Catalyst exhaust: If engine is
misfiring or fails to start within 12 seconds
the cause must be rectified. Failure to do
so will result in irreparable damage to the
catalysts. After rectification the engine must be
run at 1500 rev/min (no load) for 3 minutes to
purge any accumulation of fuel in the system.
1.Check that the inertia fuel shut off switch is not
tripped.
2.Check fuse in main fuse panel.
3.Check for ample fuel in tank.
4.Check air inlet system for possible leaks into the
intake manifold.
5.Check HT cables for correct firing order and
routing.
6.Check ignition timing.
Only when the above checks have been carried out,
should circuit diagnosis begin.
See Electrical
Trouble Shooting Manual.
INJECTOR TESTS
NOTE: Before removing any of the
injectors, remove and examine the spark
plugs, check for consistent colouration of
plugs. A leaking injector will result in the
appropriate spark plug being 'sooted up'.
The following test may only be carried out using
suitable injector test equipment.
Leak Test
Leak test with the injectors closed but pressurise to
2.54 Kgf/cm
2. No injector should leak more than 2
drops of fuel per minute.
Fuel Delivery Test
Fuel delivery test with the injector open and
pressurised as above, fuel delivery from each injector
should be 160-175cc per minute using white spirit, or
180-195cc per minute using petrol at 20°C±2°C.