bulb LAND ROVER DEFENDER 1996 Workshop Manual

04GENERAL SPECIFICATION DATA
8
INFORMATION Fuses
Type Autofuse (blade type) blow ratings to suit individual.................................................................................
circuits
Horns
Make/type Mixo TR99........................................................................
Starter motor
Make and type Bosch 12v.................................................................
BULBS
REPLACEMENT BULBS TYPE
Headlamps 12V 60/55W Halogen
Front side lamps 12V 5W bayonet
Side repeater lamps 12V 5W capless
Tail lamps 12V 5/21W bayonet
Direction indicator lamps 12V 21W bayonet
Number plate lamp 12V 5W capless
Reverse lamp 12V 21W bayonet
Rear fog guard lamp 12V 21W bayonet
Interior roof lamps 12V 10W festoon
Instrument illumination 12V 1.2W capless
Warning light panel 12V 1.2W bulb/holder unit
Hazard warning switch 12V 1.2W capless
CAUTION: The fitting of new bulbs with wattages in excess of those specified will result in damage
to vehicle wiring and switches.

70BRAKES
2
DESCRIPTION AND OPERATION REV: 05/99 OPERATION
Master cylinder
A tandem master cylinder, which is assisted by a light
weight, short, compact servo, is fed by a divided fluid
reservoir. The rear section supplies fluid for the
primary circuit and the front section the secondary
circuit.
When the brakes are off, the fluid can move
unrestricted between the dual line system and the
separate reservoirs in the fluid supply tank.
When the footbrake is applied, the primary plunger
assembly moves up the cylinder bore and the
pressure created acts in conjunction with the primary
spring to overcome the secondary springs, thus
moving the secondary plunger assembly up the bore.
At the same time initial movement of both plungers
takes the recuperating seals past the cut-off holes in
the cylinder chambers 'A' and 'C',see J6321, and
applies pressure to the fliud in those chambers, which
is directed to the respective circuits.
The fluid in chambers 'B' and 'D'is unaffected by
movement of the plungers and can move unrestricted
between the separate chambers and respective
reservoirs in the fluid supply tank, both before and
during brake application. When the brakes are
released, the plunger assemblies, aided by the return
springs are retracted faster than the fluid; this creates
a depression between the fluid in chambers 'A' and
'C'and the recuperation seals.
The recuperation seals momentarily collapse allowing
fluid in chambers 'B' and 'D'to flow through the holes
in the plungers, over the collapsed seals and into
chambers 'A' and 'C'respectively. The movement of
fluid from one set of chambers to the other, is
compensated for by fluid from the separate reservoirs
in the supply tank moving through the feed holes in
the cylinder. Conversely, the final return movement of
the plunger assemblies causes the extra fluid in
chambers 'A' and 'C'to move through the cut off holes
into the fluid reservoir.The servo unit provides controlled power assistance
to to the brake pedal when pressure is applied. Power
is obtained from a vacuum pump located on the RH
side of the engine cylinder block. The vacuum is
applied to both sides of a flexing diaphragm, and by
admitting atmosheric pressure to the rear diaphragm,
assistance is obtained. The servo unit is mounted
between the brake pedal and master cylinder and is
linked to these by push rods. Should a vacuum failure
occur, the two push rods will act as a single rod
allowing the brakes to function in the normal way,
although more effort will be required to operate the
brake pedal.
Hydraulic system
A brake fluid loss switch is fitted to the master cylinder
reservoir filler cap. The switch is wired to a warning
light on the vehicle fascia and will illuminate as a bulb
check when the ignition is switched on and
extinguishes when the engine is running and the
handbrake is released. A hydraulic failure in the
system will result in fluid loss, causing the warning
light to illuminate.
On 90 models a pressure reducing valve (PRV), fitted
to the RH bulkhead in the engine compartment,
maintains the braking balance, see J6322. Pressure
to the rear calipers is regulated by the PRV, this valve
is of the failure by-pass type, allowing full system
pressure to the rear brake calipers in the event of a
front (secondary) circuit failure.
NOTE: In some countries, a pressure
reducing valve may be fitted to 110 models
to conform to legal requirements.

AIR CONDITIONING
5
ADJUSTMENT AIR CONDITIONING SYSTEM - PERFORMANCE
TEST
WARNING: R134a is hazardousSee
Repair, General Precautions
Carry out this test with bonnet and doors or windows
open, air conditioning switched on, temperature
control set to cold and blower at maximum speed. Set
the air supply control to supply fresh air.
1.Close low pressure valve on refrigerant station.
2.Close high pressure valve on refrigerant station.
3.Connect a Refrigerant Station to the high and
low pressure servicing connections.4.Insert dry bulb thermometer into cold air outlet
and position dry and wet bulb thermometer close
to outside air inlet.
Do not spill water from the wet thermometer
(psychrometer).
5.Start engine and run it at 1500 rev/min for 10
minutes with air conditioning switched on.
6.Read both pressure gauges and thermometers.
Check readings against table below with
humidity between 60% and 80%.
7.Switch off air conditioning, stop engine,
disconnect test equipment.
Performance range
Intake temperature Outlet temperature Low pressure High pressure
20 - 24°C4-10°C 18 - 28 lbf/in
2213 - 299 lbf/in2
1.2 - 1.9 bar 14.7 - 20.6 bar
25 - 29°C9-19°C 27 - 37 lbf/in2256 - 341 lbf/in2
1.9 - 2.6 bar 17.6 - 23.5 bar
30 - 35°C20-27°C 33 - 47 lbf/in2299 - 384 lbf/in2
2.3 - 3.2 bar 20.6 - 26.5 bar
Table 1
Ambient Compound Gauge High Pressure
Temperature Readings Gauge Readings
°C°F bar lbf/in
2bar lbf/in2
16 60 1,03-1,4 15-20 6,9-10,3 100-150
26,7 80 1,4-1,72 20-25 9,6-13,1 140-190
38 100 1,72-2,1 25-30 12,4-15,5 180-225
43,5 110 2,1-2,4 30-35 14,8-17,2 215-250

ELECTRICAL
1
DESCRIPTION AND OPERATION ELECTRICAL EQUIPMENT
Description
The electrical system is Negative ground, and it is
most important to ensure correct polarity of electrical
connections at all times. Any incorrect connections
made when reconnecting cables may cause
irreparable damage to semi-conductor devices used in
generator and regulator. Incorrect polarity would also
seriously damage any transistorized equipment such
as a radio.
WARNING: During battery removal or
before carrying out any repairs or
maintenance to electrical components
always disconnect battery negative lead first. If
positive lead is disconnected with negative lead in
place, accidental contact of wrench to any
grounded metal part could cause a severe spark,
possibly resulting in personal injury. Upon
installation of battery positive lead should be
connected first.
GENERATOR
The generator is a three phase, field sensed unit. The
rotor and stator windings produce three phase
alternating current, AC, which is rectified to direct
current, DC. The electronic voltage regulator unit
controls generator output voltage by high frequency
switching of the rotor field circuit. Use only correct
replacement drive belt. Occasionally check that
engine and generator pulleys are accurately aligned.
It is essential that good electrical connections are
maintained at all times. Of particular importance are
those in the charging circuit (including those at
battery) which should be occasionally inspected to
see that they are clean and tight. In this way any
significant increase in circuit resistance can be
prevented.Do not disconnect battery cables while engine is
running or damage to semi-conductor devices may
occur. It is also inadvisable to break or make any
connections in the generator charging and control
circuits while engine is running.
The electronic voltage regulator employs micro-circuit
techniques resulting in improved performance under
difficult service conditions. The whole assembly is
encapsulated in silicone rubber and housed in an
aluminium heat sink, ensuring complete protection
against adverse effects of temperature, dust, and
moisture etc.
The regulating voltage is set during manufacture to
give required regulating voltage range of 14.2±0.2
volts, and no adjustment is necessary. The only
maintenance needed is occasional check on terminal
connections and wiping with a clean dry cloth.
The generator system provides for direct connection
of a charge (ignition) indicator warning lamp, and
eliminates the need for a field switching relay or
warning light control unit. In the event of bulb failure,
an 'exciter' voltage is supplied through a resistor,
wired in parallel to the bulbs, ensuring that generator
output is maintained. The lamp should be checked
regularly.
When using rapid charge equipment to re-charge
battery, the battery must be disconnected from the
vehicle.

ELECTRICAL
13
REPAIR HEADLAMP
Service repair no - 86.40.02
Remove
1.Remove screws retaining side and direction
indicator lamps.
2.Withdraw lamp units and disconnect plugs.
3.Remove 2 screws and withdraw headlamp
finisher.
4.Remove 2 headlamp retaining screws.
5.Rotate headlamp clockwise, disengage from
body, and lift out headlamp.
6.Disconnect multi-plug to release headlamp. On
vehicles fitted with headlamp levelling unit, also
release unit harness plug
See Headlamp
levelling unit.
7.Remove rubber cover.
8.Release spring clip and withdraw headlamp
bulb.
NOTE: Do not touch bulb glass with
fingers. If necessary, clean bulb with
methylated spirits.Refit
9.Fit bulb to headlamp and retain with spring clip.
10.Fit rubber cover and reconnect multi-plug. If
applicable, fit headlamp levelling unit plug
See
Headlamp levelling unit.
11.Locate headlamp in body and rotate
anti-clockwise to engage.
12.Fit headlamp retaining screws.
13.Fit headlamp finisher, side and direction
indicator lamps.
14.Check main beam alignment
See Headlamp
beam alignment.

86ELECTRICAL
14
REPAIR SIDE, TAIL AND DIRECTION INDICATOR LAMPS
Service repair no - 86.40.34 - Front side lamp
Service repair no - 86.40.45 - Tail lamp
Service repair no - 86.40.42 - Front direction
indicator lamp
Service repair no - 86.40.43 - Rear direction
indicator lamp
Remove
1.Remove 2 screws and withdraw lamp unit.
2.Hold bulb holder and twist lens to release.
3.Push and twist bulb to remove from holder.
Refit
4.Fit new bulb, if necessary.
5.Fit bulb holder to lamp lens.
6.Secure lamp to vehicle.SIDE REPEATER LAMP
Service repair no - 86.40.53.
Remove
1.Push lens firmly to the right.
2.Lift left edge and withdraw lamp unit from wing.
3.Twist bulb holder and release from lens.
4.Pull bulb from holder.
Refit
5.Fit new bulb, if necessary.
6.Fit bulb holder to lens.
7.Locate lamp unit in wing and push firmly to the
left to secure.

ELECTRICAL
15
REPAIR REAR NUMBER PLATE LAMP - BULB RENEWAL
Service repair no - 86.40.85
Remove
1.Remove single screw securing lamp cover and
lens to bulb holder.
2.Remove bulb/s from holder.
Refit
3.Fit new bulb/s.
4.Fit lamp lens and cover.REAR NUMBER PLATE LAMP
Service repair no - 86.40.86
Remove
1.Remove single screw and remove lamp cover
and lens.
2.Uncsrew 2 fixings and remove metal cover to
gain access to lamp fixings and harness leads
inside vehicle.
3.Disconnect lamp leads from harness.
4.Remove 2 bolts, nuts and washers securing
lamp to vehicle body.
5.Remove bulb holder, complete with rubber seal
and mounting plinth.
Refit
6.Feed lamp unit leads through vehicle body and
secure bulb holder, seal and plinth.
7.Fit lamp leads to harness connectors.
8.Fit cover to conceal lamp fixings.
9.Fit lens and lamp cover.

86ELECTRICAL
16
REPAIR REVERSE AND FOG GUARD LAMP - BULB
RENEWAL
Service repair no - 86.40.90
Remove
1.Remove two screws with sealing washers and
remove lens from lamp body.
2.Push and twist bulb to release from holder.
3.Clean interior of lamp and lens.
Refit
4.Fit new bulb.
5.Fit lens to lamp body.REVERSE AND FOG GUARD LAMP
Service repair no - 86.40.91 - Reverse lamp
Service repair no - 86.40.99 - Fog guard lamp
Remove1.From underneath the vehicle, lift protective flap
and disconnect lamp leads at harness
connectors.
2.Unscrew 2 nuts and washers and withdraw lamp
unit from vehicle.
Refit
3.Feed lamp leads through grommet and locate
lamp studs in vehicle body.
4.Fit retaining nuts and reconnect lamp leads to
vehicle harness.

ELECTRICAL
17
REPAIR INTERIOR LAMP - BULB REMOVAL
Service repair no - 86.45.01
Remove
1.Prise lens from lamp unit.
2.Spread bulb holder contacts and release bulb.
Refit
3.Spread bulb holder contacts and fit new bulb.
4.Fit lamp lens.INTERIOR LAMP
Service repair no - 86.45.02
Remove
1.Prise lens cover from lamp unit.
2.Remove 2 nuts securing lamp unit to headlining
and roof mounting bracket.
3.Remove lamp unit from mounting bracket studs
and disconnect harness plug.
4.Remove interior lamp.
Refit
5.Reconnect harness plug and locate lamp unit on
mounting bracket studs. Ensure lamp switch
eyelet is correctly seated on lamp unit base.
6.Secure lamp unit to mounting bracket and fit
lamp lens.

86ELECTRICAL
18
REPAIR REVERSE LAMP SWITCH
Service repair no - 37.27.01
Remove
The reverse lamp switch is located on the LH side of
the gearbox extension housing and is accessible from
underneath the vehicle.
1.Place vehicle on suitable ramp.
2.Disconnect reverse lamp switch lead multi-plug
from harness connector.
3.Unscrew switch from extension housing.
Refit
4.Fit new switch to gearbox extension housing.
Tighten to
25 Nm (18 lbf/ft).
5.Fit lamp switch lead multi-plug to harness
connector.
6.Check operation of lamp switch.WARNING LAMP ASSEMBLY
Service repair no - 86.45.60 - Warning lamp
assembly
Service repair no - 86.45.61 - Warning lamp bulb
renewal
Remove
1.Disconnect battery.
2.Remove 2 screws and withdraw warning light
assembly from instrument panel.
3.Remove multi-plug to give access to warning
lamp bulbs.
4.Twist bulb holder and pull it from its socket.
5.Pull bulb from holder.
Refit
6.Fit new bulb and refit holder.
7.Fit multi-plug.
8.Fit warning lamp assembly to instrument panel
9.Reconnect battery.