sensor LAND ROVER DISCOVERY 2002 Workshop Manual

MANIFOLDS AND EXHAUST SYSTEMS - V8
DESCRIPTION AND OPERATION 30-2-5
Description
General
The inlet manifold on the V8 engine is located on the top of the engine, between the cylinders. The manifold directs
intake air into the cylinders. The intake air is mixed with fuel delivered by the injectors prior to ignition in the cylinders.
The inlet manifold comprises three separate aluminium castings.
Two exhaust manifolds are used, one for each bank of four cylinders. Each exhaust manifold allows combustion
gases from the cylinders to leave the engine and directs them into the exhaust system.
The exhaust system is connected to each exhaust manifold and merges into one pipe midway along the underside of
the vehicle. A catalytic converter (where fitted) is located in the front pipe from each manifold. A silencer is installed
midway along the system and a second tail silencer is located at the rear of the vehicle.
Inlet manifold
The inlet manifold comprises three aluminium castings; a lower manifold, an upper manifold and a plenum. The inlet
manifold is located on the top of the engine and feeds air into the cylinders.
Lower manifold
The lower manifold is a one piece machined aluminium casting which locates in the vee on the top of the engine and
is secured to each cylinder head with six bolts per head. A one piece coated metal gasket seals the lower manifold to
each cylinder head and also serves as a cover for the cylinder block.
Eight injectors are fitted into the lower manifold, four on each side. Each injector is sealed in the manifold with O-ring
seals and retained in position by the fuel rails. A fuel rail is attached to each side of the manifold and secured with two
bolts.
Eight air intake ports are cast and machined on the top of the manifold, each port directing intake air into one cylinder.
These ports mate with matching ports in the upper manifold and are sealed with a coated metal gasket between the
two manifolds.
A cavity at the front of the manifold collects coolant flow from the engine. A coolant outlet pipe is sealed and attached
to the front of the manifold and provides for coolant to flow through the cavity in the casting to the radiator top hose.
A smaller port in the manifold also allows coolant to flow from the cavity to the heater matrix. The lower manifold also
locates the Engine Coolant Temperature (ECT) sensor in a port in the front of the manifold.
Upper manifold
The upper manifold is a one piece machined aluminium casting. The manifold has eight ports on its lower face which
mate with the eight ports on the lower manifold. The joint between the upper and lower manifolds is sealed with a
coated metal gasket and secured with six bolts.
The manifold divides from the eight ports into eight branches, four on each side. Each set of four branches merge into
one gallery on each side of the manifold. Each gallery has an opening at its forward end which mates with the intake
plenum.
The upper manifold provides attachment for the Idle Air Control (IAC) valve and for brackets which retain pipes, plug
leads and throttle cables.

MANIFOLDS AND EXHAUST SYSTEMS - V8
30-2-10 REPAIRS
5.Remove 2 nuts securing front pipe to
intermediate pipe/silencer.
6.Remove 6 nuts securing front pipe to exhaust
manifolds.
7.Release front pipe and collect front pipe to
manifold gaskets.
8.With assistance remove front pipe.
9.Remove HO2S from front pipe.
Refit
1.If refitting existing HO2S, apply anti-seize
compound to HO2S threads.
NOTE: A new HO2 sensor is supplied pre-
treated with anti-seize compound.
2.Fit HO2S to front pipe and tighten to 45 Nm (33
lbf.ft).
3.Clean front pipe and mating faces.
4.Position front pipe, with new front pipe to
manifold gaskets, and align front pipe with
intermediate pipe/silencer and exhaust
manifolds.
5.Fit and tighten exhaust manifold nuts to 30 Nm
(22 lbf.ft).
6.Fit and tighten intermediate pipe/silencer nuts
to 25 Nm (18 lbf.ft).
7.Fit chassis cross member and tighten bolts to
25 Nm (18 lbf. ft).
8.Connect HO2S multiplugs and secure to
support brackets.
Intermediate pipe/silencer
$% 30.10.11
Remove
1.Raise vehicle on ramp.
2.Remove 2 nuts securing intermediate pipe/
silencer to front pipe.
3.Remove 3 nuts securing intermediate pipe/
silencer to tail pipe.
4.Release intermediate pipe/silencer from
mountings and remove intermediate pipe/
silencer.
5.Collect intermediate pipe/silencer to tail pipe
gasket.
Refit
1.Clean intermediate pipe/silencer, front pipe and
tail pipe mating faces.
2.Position intermediate pipe/silencer and locate
on mountings.
3.Using a new intermediate pipe/silencer to tail
pipe gasket, align intermediate pipe/silencer
with tail pipe and front pipe.
4.Fit nuts to intermediate pipe/silencer and
tighten to 25 Nm (18 lbf.ft).

MANIFOLDS AND EXHAUST SYSTEMS - V8
REPAIRS 30-2-17
Gasket - inlet manifold - upper - Without
Secondary Air Injection
$% 30.15.24
Remove
1.Release fixings and remove battery cover.
2.Disconnect battery earth lead.
3.Remove bonnet.

+ EXTERIOR FITTINGS, REPAIRS,
Bonnet.
4.Release MAF sensor harness from clip.
5.Loosen clips securing air intake hose. Release
and remove air intake hose.
Note: Pre 03 MY air intake hose illustrated.
6.Disconnect throttle and cruise control cables.
Release cables from abutment bracket and
position aside. 7.Disconnect EVAP pipe from inlet plenum.
8.Disconnect multiplug from throttle body.
9.Remove clip securing breather hose to throttle
body and release breather hose.
10.Position a drain tray beneath the engine to
collect coolant.
11.Release clips securing coolant hoses to
throttle body and disconnect hoses.
12.Disconnect brake servo vacuum pipe from inlet
plenum.

MANIFOLDS AND EXHAUST SYSTEMS - V8
30-2-18 REPAIRS
13.Disconnect breather hose from inlet plenum.
14.Remove bolt securing coolant rails.
15.Release engine harness from bulkhead clips
and position aside.
16.Remove 4 bolts securing ignition coils and
position ignition coils aside.
17.Release plug leads from upper manifold clips.
18.Disconnect multiplug from IACV.
19.Release and disconnect IACV hose.
20.Remove 6 bolts securing upper inlet manifold
and remove upper inlet manifold. 21.Collect upper inlet manifold gasket.
Refit
1.Clean upper and lower inlet manifold mating
faces, dowels and dowel holes.
2.Using a new gasket, position upper inlet
manifold. Fit bolts and, working in a diagonal
sequence, tighten to 22 Nm (16 lbf.ft).
3.Connect hose and multiplug to TP sensor.
4.Connect hose and multiplug to IACV. Secure
hose with clip.
5.Secure ht leads to upper inlet manifold.
6.Position ignition coils, fit bolts and tighten to 8
Nm (6 lbf.ft).
7.Ensure clip under ignition coils is located on
fuel pipe.
8.Secure engine harness in bulkhead clips.
9.Fit coolant rail bolt and tighten to 22 Nm (16
lbf.ft).
10.Connect breather hose to inlet plenum.
11.Connect brake servo vacuum pipe to inlet
plenum.
12.Connect EVAP pipe to inlet plenum.
13.Position coolant hoses to throttle body and
secure hose clips.
14.Fit breather hose to throttle body and secure
clip.
15.Connect multiplug to throttle body.
16.Connect throttle and cruise control cables and
secure in throttle body cams.
17.Adjust throttle and cruise control cables.
l

+ ENGINE MANAGEMENT SYSTEM
- V8, ADJUSTMENTS, Cable - cruise
control.
l

+ ENGINE MANAGEMENT SYSTEM
- V8, ADJUSTMENTS, Cable - throttle.
18.Connect air intake hose and tighten clips.
Secure harness to air intake hose.
19.Top-up cooling system

+ MAINTENANCE, PROCEDURES,
Cooling system..
20.Fit bonnet.

+ EXTERIOR FITTINGS, REPAIRS,
Bonnet.
21.Connect battery earth lead.
22.Fit battery cover and secure with fixings.

MANIFOLDS AND EXHAUST SYSTEMS - V8
REPAIRS 30-2-19
Gasket - inlet manifold - upper - With
Secondary Air Injection
$% 30.15.24
Remove
1.Release fixings and remove battery cover.
2.Disconnect battery earth lead.
3.Remove bonnet.

+ EXTERIOR FITTINGS, REPAIRS,
Bonnet.
4.Disconnect multiplug from MAF sensor.
5.Release clip on intake hose and release
harness.
Note: Pre 03 MY air intake hose illustrated.
6.Release and disconnect IACV hose.
7.Loosen clip securing air intake hose to throttle
body.
8.Release 2 clips securing MAF sensor.
9.Release and remove air intake hose.10.Disconnect vacuum hose from air valve.
11.Loosen clip securing air valve hose to air valve.
12.Remove 2 nuts securing air manifold support
bracket to upper inlet manifold.
13.Disconnect 2 air manifold unions from adapters
in cylinder head.
14.Remove LH air manifold.
15.Disconnect purge valve hose from inlet
manifold.
16.Release purge valve from clips and air control
valve from bracket and lay aside.
17.Disconnect multiplug from IACV.
18.Release clip and disconnect breather hose
from throttle housing.
19.Disconnect multiplug from TP sensor.

MANIFOLDS AND EXHAUST SYSTEMS - V8
REPAIRS 30-2-21
34.Release clip and disconnect IACV hose.
35.Remove 6 bolts securing upper manifold and
remove manifold.
36.Collect upper manifold gasket.
Refit
1.Clean upper and lower inlet manifold mating
faces, dowels and dowel holes.
2.Using a new gasket, position upper inlet
manifold. Fit bolts and, working in a diagonal
sequence, tighten to 22 Nm (16 lbf.ft).
3.Connect IACV hose and secure clip.
4.Connect hose to air valve and tighten clip.
5.Secure plug leads to clips.
6.Fit and tighten nuts securing RH air manifold
support bracket.
7.Align air pipe and coil bracket, fit bolts and
tighten to 8 Nm (6 lbf.ft).
8.Tighten 2 lower bolts securing coil bracket to 8
Nm (6 lbf.ft).
9.Fit bonnet seal.
10.Secure engine harness in bulkhead clips.11.Connect breather hose to manifold and secure
clip.
12.Connect vacuum hose to inlet manifold.
13.Connect brake servo hose to inlet manifold.
14.Connect throttle and cruise control cables.
15.Adjust throttle cable.

+ ENGINE MANAGEMENT SYSTEM -
V8, ADJUSTMENTS, Cable - throttle.
16.Adjust cruise control cable.

+ ENGINE MANAGEMENT SYSTEM -
V8, ADJUSTMENTS, Cable - cruise control.
17.Connect coolant hoses to throttle housing and
secure clips.
18.Connect multiplug to TP sensor.
19.Connect breather hose to throttle housing and
secure with clip.
20.Connect multiplug to IACV.
21.Secure purge valve and air control valve to clips
and bracket.
22.Connect purge hose to manifold.
23.Clean air manifold unions, position manifold
and start union nuts.
24.Fit and tighten nuts securing air manifold
support bracket.
25.Tighten air manifold union nuts to 25 Nm (18
lbf.ft)
26.Connect hose to air valve and tighten clip.
27.Connect vacuum hose to air valve.
28.Fit air intake hose.
29.Connect multiplug to MAF sensor.
30.Secure harness to clip.
31.Connect battery earth lead.
32.Fit battery cover and secure with fixings.
33.Top up cooling system.

+ MAINTENANCE, PROCEDURES,
Cooling system.
34.Fit bonnet.

+ EXTERIOR FITTINGS, REPAIRS,
Bonnet.

CLUTCH - TD5
DESCRIPTION AND OPERATION 33-1-7
Dual mass flywheel
1Ring gear
2Primary flywheel
3Inner drive plate
4Spring housing
5Secondary flywheel
6Rivet
7Ball bearing8Dowel location hole
9Mounting hole
10Inner spring
11Outer spring
12Crankshaft position sensing holes
13Pressure plate locating dowel
The dual mass flywheel is bolted on the rear of the crankshaft with eight bolts. A dowel on the crankshaft flange
ensures that the flywheel is correctly located. A ring gear is fitted on the outer diameter of the flywheel. The ring gear
is not serviceable. Thirty blind holes are drilled in the outer diameter of the flywheel adjacent to the ring gear. The
holes are positioned at 10
° intervals with four 20° spaces. The holes are used by the crankshaft position sensor for
engine management.

+ ENGINE MANAGEMENT SYSTEM - Td5, DESCRIPTION AND OPERATION, Description.

CLUTCH - V8
DESCRIPTION AND OPERATION 33-2-7
Flywheel
The flywheel is bolted to a flange on the rear of the crankshaft with six bolts. A dowel on the crankshaft flange ensures
that the flywheel is correctly located. A ring gear is fitted on the outside diameter of the flywheel and seats against a
flange. The ring gear is an interference fit on the flywheel and is installed by heating the ring and cooling the flywheel.
The ring gear is a serviceable item and can be replaced if damaged or worn.
The operating face of the flywheel is machined to provide a smooth surface for the drive plate to engage on. Three
dowels and six threaded holes provide for the location and attachment of the pressure plate. The flywheel is balanced
to ensure that it does not produce vibration when rotating. A machined slot, with a series of holes within the slot, is
located on the engine side of the flywheel. The slot accommodates the tip of the crankshaft position sensor which is
used by the Engine Control Module (ECM) for engine management.

+ ENGINE MANAGEMENT SYSTEM - V8, DESCRIPTION AND OPERATION, Description - engine
management.
Pressure plate
1Leaf spring
2Fulcrum ring
3Fulcrum ring
4Drive plate
5Pressure plate6Diaphragm
7Cover
8Rivet
9Retractor clip
The pressure plate assembly comprises a pressure plate, cover and diaphragm and is mounted on and rotates with
the flywheel.

MANUAL GEARBOX - R380
37-14 REPAIRS
24.Remove clevis pin and 'C' washer securing low
ratio selector cable to lever and release cable
from lever housing.
25.Remove 2 cable ties securing cable to fuel
pipes.
26.Disconnect 2 Lucars from oil temperature
sensor and disconnect reverse lamp switch
multiplug.
27.Remove banjo bolts securing breather pipes
and discard sealing washers. 28.Remove bolt securing breather pipe 'P' clip and
release breather pipes.
29. If fitted: Disconnect 2 Lucars from differential
lock switch, release and disconnect transfer
box neutral sensor multiplug.
30. If fitted: Release harness from 2 retaining
clips.
31.Position container to catch oil spillage
32.Remove 3 bolts securing oil cooling pipe
housing to gearbox, release housing and
discard 'O' rings.
33.Using a second jack support the weight of the
engine.

MANUAL GEARBOX - R380
REPAIRS 37-15
34.Remove 14 bolts securing gearbox to engine.
35.With assistance, remove gearbox from engine.
Refit
1.Clean gearbox to engine mating faces, dowels
and dowel holes.
2.Raise gear gearbox on jack and align to clutch
and engine.
3.Fit bolts securing gearbox to engine and
tighten to 45 Nm (33 lbf.ft).
4.Lubricate and fit new 'O' rings to oil cooling
pipe housing.
5.Position coolant pipe housing, fit bolts and
tighten to 25 Nm (18 lbf.ft).
6. If fitted: Secure harness in retaining clips,
connect Lucars to differential lock warning
switch and multiplug to neutral sensor.
7.Position breather pipes and secure 'P' clip with
bolt.
8.Using new sealing washers fit breather pipe
banjo bolts and tighten to 15 Nm (11 lbf.ft).
9.Connect oil temperature sensor Lucars and
reverse lamp switch multiplug.
10.Position low ratio selector cable to housing and
secure with 'C' washer and clevis pin.
11.Secure cable to fuel pipes with new cable ties.
12.Raise gearbox, ensuring gear change lever is
located in grommet.
13.Fit gearbox mountings and tighten bolts to 85
Nm (63 lbf.ft). 14.Fit nuts to mountings and tighten to 48 Nm (37
lbf.ft).
15.Remove 3 bolts securing support plate to
gearbox.
16.Position clutch slave cylinder and heat shield,
fit bolts and tighten to 25 Nm (18 lbf.ft).
17.Clean handbrake back plate and mating face.
18.Position handbrake back plate, fit bolts and
tighten to 75 Nm (46 lbf.ft).
19.Clean handbrake drum.
20.Fit handbrake drum and tighten retaining
screw.
21.Clean propeller shafts and mating faces.
22.Position propeller shafts, align to marks and
tighten bolts to 47 Nm (35 lbf.ft).
23.Clean exhaust silencer and tail pipe mating
faces.
24.Position silencer and secure on mountings,
using a new gasket align to tail pipe, fit nuts
and tighten to 25 Nm (18 lbf.ft).
25.Position rear cross member, fit bolts and
tighten to 25 Nm (18 lbf.ft).
26.Refill gearbox with oil.

+ MAINTENANCE, PROCEDURES,
Manual gearbox.
27.Refill transfer gearbox oil.

+ MAINTENANCE, PROCEDURES,
Transfer box.
28.Fit front exhaust pipe.

+ MANIFOLDS AND EXHAUST
SYSTEMS - V8, REPAIRS, Front pipe.
29.Fit gear lever extension, fit clamp bolt and
tighten to 25 Nm (18 lbf.ft).
30.Fit gear lever trim and gear change knob.
31.Connect battery earth lead.
32. Fit battery cover and cooling fan cover and
secure fixings.