1999 LAND ROVER DISCOVERY bonnet

CAPACITIES, FLUIDS, LUBRICANTS AND SEALANTS
09-4
Gearbox oil
Manual Gearbox: Use Texaco MTF 94 oil for refill
and topping-up.
Automatic Gearbox: Use Texamatic 9226, ATF
Dexron 11D or Dexron 111 for refill and topping-up
Transfer box
Use Texaco Multi-Gear 75W/90R or oil meeting
specification API GL5.
Front and rear axles
Use Texaco Multi-Gear 75W/90R.
Air Conditioning
Use lubricating oil Nippon Denso ND-8.
General Greasing
Use Multipurpose Lithium Base Grease N.L.G.I.
consistency No. 2.
Bonnet latch
Lubricate cable and latch with oil.
Sealants
The following table lists those sealants which are
used during repair / overhaul procedures covered in
this manual; it is essential that the sealant specified
for a particular procedure is used at all times.
Component Application Land Rover
Part No.
Td5 Engine Timing chain fixed
guide Allen screwSTC 50552
Td5 Engine Camshaft cover
gasket joint lineSTC 50550
Td5 Engine Oil pick-up strainer
Torx screwsSTC 50552
Td5 Engine Oil pump drive
sprocket retaining
boltSTC 50552
Td5 Engine Timing chain cover,
crankshaft rear oil
seal and sump
gasket joint linesSTC 50550
Td5 Engine Oil pressure relief
valve plugSTC 50552
Td5 Engine Camshaft carrier to
cylinder headSTC 4600
Td5 Engine Timing cover STC 50550
V8 Engine Sump gasket to
cylinder blockSTC 50550
V8 Engine 'V' grooves at end
of cylinder head -
Inlet manifold
gasketSTC 50550
V8 Engine Cruciform seal
endsSTC 50550
V8 Engine Dipstick tube STC 50554
V8 Engine Timing cover bolts STC 50552
Engine
Management
System - V8Engine coolant
temperature (ECT)
sensor threadsSTC 50552
Manifolds and
Exhaust
System - V8'V' grooves at end
of cylinder head -
Inlet manifold
gasketSTC 50550
Manual
Gearbox -
R380Gear selector
housingSTC 4404
Manual
Gearbox -
R380Selector housing
boltsSTC 50552
Manual
Gearbox -
R380Input shaft oil seal
housingSTC 4404
Manual
Gearbox -
R380Reverse inhibitor
shaft threadsSTC 50552

MAINTENANCE
PROCEDURES 10-1
MAINTENANCE PROCEDURES
V8 engine underbonnet view
1Brake/clutch fluid reservoir filler caps
2Engine oil filler cap
3Spark plug
4Engine oil dipstick
5Coolant header tank6Battery
7Auxiliary drive belt
8ACE/PAS fluid reservoirs
9Windscreen washer reservoir

MAINTENANCE
10-2 PROCEDURES
Diesel underbonnet view
1Coolant header tank
2Brake/clutch fluid reservoir filler caps
3Engine oil dipstick
4Engine oil filler cap
5ACE/PAS fluid reservoirs6Battery
7Auxiliary drive belt
8Air cleaner
9Windscreen washer reservoir

MAINTENANCE
10-8 PROCEDURES
Road wheels
Refit
1.Apply anti-seize compound to wheel hub
centre.
2.Refit road wheels to original hub position.
Tighten wheel nuts to 140 Nm (103 lbf.ft).
Radiator/Intercooler
Check
1.Visually check radiator/intercooler for external
obstructions, remove debris.
2.Visually check fan blades for damage.
Ambient air Temperature and pressure
sensor
Check
1.Check ambient air temperature and pressure
sensor for damage.
Doors, bonnet and fuel filler flap
Check
1.Check operation of each door, door lock,
bonnet catch and fuel filler flap. Ensure doors
close securely.
Lubricate
1.Lubricate door locks, hinges, check straps,
bonnet catch and fuel filler flap.

+ CAPACITIES, FLUIDS,
LUBRICANTS AND SEALANTS,
Lubrication.

EMISSION CONTROL - V8
17-2-14 DESCRIPTION AND OPERATION
The heated oxygen sensor is screwed into threaded mountings welded into the top of the front exhaust pipes at
suitable locations. They are used to detect the level of residual oxygen in the exhaust gas to provide an instantaneous
indication of whether combustion is complete. By positioning sensors in the stream of exhaust gases from each
separate bank of the exhaust manifold, the engine management system is better able to control the fuelling
requirements on each bank independently of the other, so allowing much closer control of the air:fuel ratio and
optimising catalytic converter efficiency.
Two pre-catalytic converter heated oxygen sensors are mounted in the front pipes for monitoring the oxygen content
of the exhaust gas. NAS models also have two additional post-catalytic converter heated oxygen sensors in the
exhaust front pipe.
CAUTION: HO2 sensors are easily damaged by dropping, over torquing, excessive heat or contamination.
Care must be taken not to damage the sensor housing or tip.
The oxygen sensors consist of a ceramic body (Galvanic cell) which is a practically pure oxygen-ion conductor made
from a mixed oxide of zirconium and yttrium. The ceramic is then coated with gas-permeable platinum, which when
heated to a sufficiently high temperature (≥ 350° C) generates a voltage which is proportional to the oxygen content
in the exhaust gas stream.
The heated oxygen sensor is protected by an outer tube with a restricted flow opening to prevent the sensor's
ceramics from being cooled by low temperature exhaust gases at start up. The post-catalytic sensors have improved
signal quality, but a slower response rate.
The pre-catalytic and post-catalytic converter sensors are not interchangeable, and although it is possible to mount
them in transposed positions, their harness connections are of different gender and colour. It is important not to
confuse the sensor signal pins; the signal pins are gold plated, whilst the heater supply pins are tinned,
mixing them up will cause contamination and adversely affect system performance.
Each of the heated oxygen sensors have a four pin connector with the following wiring details:
lSensor signal ground (grey wire – connects to engine management ECM)
lSensor signal (black wire – connects to engine management ECM)
lHeater drive (white wire – connects to engine management ECM)
lHeater supply (white wire – connects to fuse 2, underbonnet fuse box)
The ECM connector pins for exhaust emission control are listed in the following table:
ECM Connector 2 (C635) pin-out details for exhaust emission control system
The heated oxygen sensors should be treated with extreme care, since the ceramic material within them can be easily
cracked if dropped, banged or over-torqued; the sensors should be torqued to the recommended values indicated in
the repair procedures. Apply anti-seize compound to the sensor's threads when refitting.
WARNING: Some types of anti-seize compound used in service are a health hazard. Avoid skin contact.
WARNING: To prevent personal injury from a hot exhaust system, do not attempt to disconnect any
components until the exhaust system has cooled down.
CAUTION: Do not allow anti-seize compound to come into contact with tip of sensor or enter exhaust system.
NOTE: A new HO2 sensor is supplied pre-treated with anti-seize compound.
Pin Number Function Signal Type Control
2-01 Post-cat sensor heater (RH) - NAS only Output, Drive PWM, 12 - 0V
2-07 Post-cat sensor heater (LH) - NAS only Output, Drive PWM, 12 - 0V
2-08 Post-cat sensor (RH) - NAS only Ground, Signal 0V
2-09 Pre-cat sensor (LH) Ground, Signal 0V
2-10 Pre-cat sensor (RH) Ground, Signal 0V
2-11 Post-cat sensor (LH) - NAS only Ground, Signal 0V
2-13 Pre-cat sensor heater (RH) Output, Drive PWM, 12 - 0V
2-14 Post-cat sensor (RH) - NAS only Input, Signal Analogue, 0 - 1V
2-15 Pre-cat sensor (LH) Input, Signal Analogue, 0 - 1V
2-16 Pre-cat sensor (RH) Input, Signal Analogue, 0 - 1V
2-17 Post-cat sensor (LH) - NAS only Input, Signal Analogue, 0 - 1V
2-19 Pre-cat sensor heater (LH) Output, Drive PWM, 12 - 0V

MANIFOLDS AND EXHAUST SYSTEMS - V8
REPAIRS 30-2-15
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.

MANIFOLDS AND EXHAUST SYSTEMS - V8
REPAIRS 30-2-17
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
30-2-18 REPAIRS
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.
CAUTION: Take care that air manifold pipes
are not damaged during removal of union
nuts.
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.