1995 LAND ROVER DISCOVERY power steering

12ENGINE
8
REPAIR 21.Release clip and disconnect inlet hose from
power steering pump.
22.Disconnect outlet pipe union at power steering
pump, discard 'O' ring.
CAUTION: Plug the connections
23.Release throttle cable from abutment bracket.
24.Release throttle cable from cam. Also remove
coolant bypass hose from throttle housing.
25.Disconnect stepper motor and throttle
potentiometer multiplugs.
26.Release clip and disconnect hose, air cleaner to
throttle housing.
27.Release clip and disconnect brake servo hose
from manifold.
28.Disconnect fuel temperature sensor multiplug.

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.

19FUEL SYSTEM
6
REPAIR FUEL FILTER ELEMENT
Service repair no - 19.25.07
Remove
1.Disconnect battery negative lead.
2.Clean area around filter head.
3.Place a suitable container beneath filter bowl to
collect any spillage.
4.Loosen bleed screw.
5.Loosen drain tap, allow fuel to drain into
container.
6.Unscrew filter element, discard element.
Refit
7.Clean seal and seating in filter head.
8.Lubricate filter element seal with fuel.
9.Position filter element to filter head and hand
tighten.
10.Reconnect battery negative lead.
11.Crank engine until fuel is drawn through the
system and starts.INTERCOOLER
Service repair no - 19.42.15
Remove
1.Disconnect battery negative lead.
2.Release 2 clips securing fan cowl to radiator top
cover.
3.Remove 4 bolts securing radiator top cover,
remove top cover.
4.Remove nut, bolt and washers securing
intercooler side cover bracket to bonnet [hood]
platform.
5.Release bracket from side cover lug, position
bracket and power steering reservoir aside.
6.Position side cover away from intercooler.
7.Loosen 2 clips and disconnect top hose from
intercooler.
8.Loosen 2 clips and disconnect bottom hose from
intercooler.

26COOLING SYSTEM
2
REPAIR WATER PUMP
Service repair no - 26.50.01
Remove
WARNING: Disconnect battery negative
terminal to prevent engine being started
before removing drive belts.
1.Drain engine cooling system.
See Adjustment,
Coolant
2.Remove top hose radiator to thermostat.
3.Remove top hose intercooler to induction
manifold.
4.Slacken water pump and power steering pump
pully retaining bolts.
5.Remove drive belt.
6.Remove centre nut from belt tensioner.
7.Manoeuvre pulley upwards and withdraw
tensioner from retaining stud.
8.Disconnect hose thermostat to bottom hose,
release hose from clip on water pump and move
aside.
9.Remove water pump pulley.
10.Remove power steering pump pulley.
11.Remove 8 bolts securing water pump, noting
location of 3 through bolts.
12.Withdraw pump and gasket, clean all gasket
material from mating surfaces.
Refit
13.Refit water pump in reverse order to removal
using new gasket.RADIATOR
Service repair no - 26.40.01
Remove
1.Drain cooling system.
See Adjustment,
Coolant
2.Disconnect radiator top hose.
3.Remove fan blade assembly.
4.Remove cowl.
5.Disconnect engine oil cooler connections and
turbo intercooler connections from radiator ends.
NOTE: Oil spillage will occur when
connections are loosened. Blank off
exposed oil connections.
6.Disconnect expansion tank bleed hose from
radiator.
7.Remove radiator securing brackets from each
side.
8.Remove radiator unit by lifting from its location.
Check condition of rubber mounting pads.
Refit
9.Check radiator sealing strips are securely
located.
10.Transfer oil cooler adaptors if fitting new radiator.
11.Reverse removal procedure. Tighten oil cooler
connections to
30 Nmbefore fitting fan blades
and cowl.
12.Check all connections for leaks.

STEERING
1
DESCRIPTION AND OPERATION DESCRIPTION
The power assisted steering system incorporates a
compression joint in the lower shaft, designed to
collapse on impact and for certain countries, an air
bag located in the centre of the steering wheel.
The mis-alignment of the upper steering column with
the steering box and the inclusion of two universal
joints and a compression joint in the lower shaft, is
also designed to prevent frontal impact moving the
column toward the driver.
The steering box is located behind the first cross
member of the chassis and is connected to the road
wheels by the drag link and track rod. An hydraulic
damper absorbs shocks in the steering, caused by
road wheel deflections when operating on rough
terrain.Power steering system
The power steering system comprises a hydraulic
pump which is belt driven from the engine and
supplied with fluid from a reservoir that also acts as a
cooler.
The steering box houses a self neutralizing rotary
valve which is part of the worm/valve assy and a
hydraulic piston/rack to assist the mechanical
operation.
The rotary valve which is operated by movement of
the steering wheel, directs fluid pressure to the
appropriate side of the hydraulic piston/rack to provide
assistance.
Power steering system
1. Hydraulic pump
2. Fluid reservoir
3. Steering box
4. Upper column
5. Universal joints
6. Lower shaft
7. Compression joint
8. Drag link

57STEERING
4
DESCRIPTION AND OPERATION
Power steering box components
1. Housing complete with sector shaft bearings
2. Cover plate complete with bearing
3. Sector shaft
4. Hydraulic piston/rack
5. Worm/valve and torsion bar assembly
6. Shims for centralizing worm/valve
7. Ball race (2)
8. 'Teflon' seals for valve sleeve (3)
9. Bearing adjuster, locknut and seal
10. Worm shaft pressure seal, circlip and dirt
excluder11. 'Teflon' and rubber seal for piston
12. End cover seal and snap ring
13. Adjustment components for piston/rack
14. Hydraulic pipe
15. Bleed screw
16. Sector shaft adjustment lock nut with seal
17. Cover plate bolts (4)
18. Cover plate seal
19. Seal, washer and backup seal
20. Circlip and dust cover

STEERING
1
FAULT DIAGNOSIS INSUFFICIENT POWER ASSISTANCE
1.Is fluid level correct?
YES - go to 3.
NO - Fill/bleed sytem
2.Is problem a leak?
YES - Diagnose.
See Power Steering Fluid
Leaks
NO - continue
3.Is drive belt tension correct?
YES - go to 5.
NO - retension.
See ENGINE, Repair, Drive
Belt
4.Is problem resolved?
YES - end
NO - continue
5.Carry out pressure test at idle and 1000 rev/min.
See Power Steering System - Test
6.Is correct pressure achieved?
YES - steering box defective
Not at any speed go to 9.
Not at idle go to 7.
7.Is idle speed correct?
YES- Goto8.
NO - Correct idle speed -
If 3.9
See ENGINE TUNING DATA,
Information, Engine 3.9 V8i
If TdiSee ENGINE TUNING DATA,
Information, 300 Tdi Engine
If MpiSee ENGINE TUNING DATA,
Information, Engine - Mpi - 2.0 Litre
8.Is problem resolved?
YES - end
NO - go to 9.
9.Bypass steering box using adaptor tap
LRT-57-001
10.Is correct pressure obtained?
YES - defective steering box
NO - defective steering pump
CAUTION: Do not hold steering wheel on
full lock for more than 30 seconds in any
one minute to avoid overheating fluid and
possibly damaging seals.
NOTE: 1. Excessive pressure in the
system is almost always caused by a
faulty relief valve in the PAS pump.
NOTE: 2. Insufficient pressure in the
system is usually caused by low fluid level
or PAS pump drive belt slip, or one of the
following: PAS system leaks, faulty PAS pump
relief valve, fault in steering box valve and worm
assembly, leak at piston in steering box, worn
components in PAS pump or box.

57STEERING
2
FAULT DIAGNOSIS POWER STEERING SYSTEM - TEST
NOTE: If steering lacks power assistance.
Check pressure of hydraulic pump before
fitting new components. Use fault
diagnosis chart to assist in tracing faults.
A. Steering box.
B. Steering pump.
C. Existing hose, steering box to pump.
D. Hose LRT-57-030.
E. Test adaptor LRT-57-001.
F. Pressure gauge LRT-57-005.
G. Thread adaptor LRT-57-004.
H. Thread adaptor LRT-57-022.Procedure
1.A hydraulic pressure gauge and test adaptor is
used to test power steering system. This gauge
is able to measure 140 kgf/cm
2. The maximum
power steering system pressure is 77 kgf/cm2.
2.Some fault conditions of hydraulic pump may
obtain pressures up to 105 kgf/cm
2. Pressure on
gauge is same pressure being exerted upon
steering wheel. When testing, turn steering
wheel gradually while reading pressure gauge.
3.Check and maintain maximum fluid level of
reservoir.
4.Examine power steering units and connections
for leaks. All leaks must be rectified before
attempting to test the system.
5.Check steering pump drive belt tension.
See
ENGINE, Repair, Drive Belt
6.Assemble test equipment and fit to vehicle, as
shown in RR3959M.
7.Open tap of adaptor.
8.Bleed system, take care not to overload
pressure gauge.
9.With system in good condition, pressures should
be:
(A) Steering wheel held on full lock and engine
running at 1,000 rev/min, 70 to 77 kgf/cm
2.
(B) Steering wheel held on full lock and engine
idling, 28 kgf/cm
2.
Checks should be carried out on both full lock
positions.
CAUTION: Do not maintain this pressure
for more than 30 seconds in any one
minute to avoid overheating fluid and
possibly damaging seals.
10.Release steering wheel and with engine idling.
Pressure should read below 7 kgf/cm
2.
11.If pressures differ to those given a fault exists.
12.To determine if fault is steering box or pump.
Close adaptor tap for a maximum five seconds.
13.If gauge does not register specified pressure,
pump is faulty.
14.Fit a new pump, bleed system and repeat test. If
low pressure or a substantial imbalance exists,
fault is in steering box valve and worm
assembly.