1995 LAND ROVER DISCOVERY ECU

CLUTCH
1
DESCRIPTION AND OPERATION DESCRIPTION
The clutch unit fitted with the manual transmission,
comprises a single dry plate friction disc and
diaphragm spring clutch unit, secured to the engine
flywheel.OPERATION
The unit is operated hydraulically by the clutch master
cylinder 12 and a slave cylinder 13 attached to the
transmission bell housing.
1. Crankshaft and flywheel
2. Friction plate
3. Clutch cover
4. Diaphragm spring
5. Pressure plate
6. Fulcrum posts (9) for diaphragm spring
7. Bearing rings (2) for diaphragm spring
8. Retraction links and bolts (3) for pressure plate
9. Release bearing
10. Release lever11. Release lever pivot post
12. Master cylinder
13. Slave cylinder
14. Master cylinder pedal pushrod
15. Primary shaft and taper bearing (in gearbox)
16. Gearbox front cover
17. Primary shaft flywheel bush
18. Pedal pivot and return spring
19. Hydraulic damper (Diesel only)

33CLUTCH
2
FAULT DIAGNOSIS FAULT/SYMPTOM CHART
Symptoms
Slip Spin/Drag Judder/Fierce Fault Item
* * * Worn or oil on clutch linings 2
* * * Mechanical damage45678
* * Distorted clutch plate 2
* Failed or air in hydraulic system 12 13
* * Primary shaft tight fit in crankshaft bush 15 17
* Clutch splines sticking 2 15
* Weak clutch plate springs or insecure/worn
engine/gearbox mountings6
* Insecure/worn propeller shafts
* Insecure/worn suspension components/rubber
bushes
For items refered to in this chart.See Description and operation, Description
CLUTCH NOISE - MECHANICAL FAULTS
Noise from clutch or gearbox in neutral, which
disappears when clutch is depressed.
Suspect gearbox input/primary shaft bearings.
See MANUAL GEARBOX, Fault diagnosis,
Manual Gearbox
- Noise from gearbox in neutral, which
disappears when clutch is depressed
Noise from clutch or gearbox in neutral, which
changes tone or becomes worse when the clutch
is depressed.
Suspect worn release bearing.
Knocking/rattling from clutch or gearbox in
neutral, which is reduced or disappears when the
clutch is depressed.
Suspect worn/weak release lever retainer or
clutch unit.
Noise from clutch or gearbox in neutral, which
disappears when clutch is depressed.
Suspect gearbox fault.
See MANUAL GEARBOX, Fault diagnosis,
Manual Gearbox
- Noise from gearbox in neutral, which
disappears when clutch is depressed.HYDRAULIC FAULTS
Unable to dis-engage clutch, little or no pedal
resistance.
1.Check condition, specification and level of fluid.
2.Check pipes and cylinders for leaks.
3.Check that air vent in reservoir lid is clear.
Suspect faulty master cylinder if no fluid leaks
present.
See Repair, Master Cylinder
Spongy pedal operation
1.Check condition, specification and level of fluid.
2.Check that air vent in reservoir lid is clear.
Suspect air in fluid.
See Repair, Bleed Hydraulic System
Clutch is difficult to dis-engage and/or does not
immediately re-engage when pedal is released.
1.Check condition, specification and level of fluid.
2.Check that air vent in reservoir lid is clear.
Suspect pedal pivot, master cylinder or slave
cylinder seizure.
See Repair, Master Cylinder

CLUTCH
1
REPAIR CLUTCH ASSEMBLY
Service repair no - 33.10.01
Clutch pressure plate
Renew pressure plate if diaphragm spring fingers are
worn or if pressure plate shows signs of wear, cracks
or burning.
Clutch driven plate
Renew driven plate if centre hub splines are worn or if
lining is contaminated, burned or unevenly worn.
Service tools:
Clutch centralising tool
LRT-12-001 - V8
LRT-12-040 - Tdi
LRT-12-057 - Mpi
Remove
1.Remove gearbox.
See MANUAL GEARBOX,
Repair, R380 Manual Gearbox
2.Mark position of clutch cover to flywheel for
reassembly.
3.Remove clutch cover securing bolts, working
evenly and diagonally.
4.Do not disturb three bolts in clutch cover.
5.Remove clutch assembly.
6.Withdraw clutch driven plate.
Refit
NOTE: To prevent clutch plate sticking,
lubricate splines using Rocol MV 3 or
Rocol MTS 1000 grease.
7.Renew/refit clutch driver plate and clutch
assembly using centralising tool, where
applicable, align assembly marks.
8.Secure clutch assembly cover fixings evenly,
working in a diagonal sequence. Tighten to
28
Nm.
9.Fit gearbox to engine.

33CLUTCH
4
REPAIR SLAVE CYLINDER
Service repair no - 33.35.01
NOTE: All flexible and pipe connections
and joints should be tightened to
15 Nm.
Remove
1.Evacuate clutch system fluid at slave cylinder
bleed valve.
2.Disconnect fluid pipe.
3.Remove two securing bolts and withdraw slave
cylinder and backing plate.
4.If dust cover is not withdrawn with slave cylinder,
withdraw it from bell housing.
Refit
5.Withdraw dust cover and backing plate from
slave cylinder.
6.Coat both sides of backing plate with Hylomar
P232M waterproof jointing compound.
7.Locate backing plate and dust cover in position
on slave cylinder.
8.Fit slave cylinder, engaging push-rod through
centre of dust cover and with bleed screw
uppermost.
9.Reconnect fluid pipe.
10.Replenish and bleed clutch hydraulic system.
11.Check for fluid leaks with pedal depressed and
also with system at rest.

CLUTCH
5
REPAIR RENEWING HYDRAULIC DAMPER - Tdi
Service repair no - 33.15.05
NOTE: All flexible and pipe connections
and joints should be tightened to
15 Nm.
Remove
1.Remove the pipe between the slave cylinder and
damper.
2.Disconnect the hydraulic hose from the damper.
3.Remove the two bolts securing the damper to
the bracket and remove the damper.
Refit
4.Fit the damper to the bracket and tighten the two
bolts.
5.Connect the flexible hose to the damper.
6.Fit the pipe to the slave cylinder and to the
damper and tighten the unions.
7.Bleed the hydraulic system.

CLUTCH
1
OVERHAUL MASTER CYLINDER
Service repair no - 30.20.07
1.Remove master cylinder.
See Repair, Master
Cylinder
Disassemble
2.Pull back and remove rubber sealing boot from
pushrod.
3.Depress push-rod and extract circlip.
4.Withdraw push-rod assembly.
5.Withdraw piston assembly.
6.Withdraw retainer and spring.
7.Remove two piston seals and piston washer.
Inspecting
8.Clean all components thoroughly using new
hydraulic fluid. Dry, using a lint-free cloth.
9.Examine cylinder bore and piston, ensure they
are smooth to touch with no corrosion, score
marks or ridges. If in doubt, fit new components.
10.Fit new seals and rubber boot. These items are
all included in master cylinder overhaul kit.
11.Ensure that feed and by-pass ports are not
obstructed.
12.Ensure reservoir cap vent is clear.
Assemble
NOTE: Cleanliness is essential, ensure
hands are free of grease or dirt. Lubricate
cylinder bore and rubber seals with new
hydraulic fluid before assembly.
13.Fit a new piston washer and thinner of two piston
seals, lip last, over piston nose, up against
drilled piston head. Fit thicker seal into piston
groove with lip facing towards seal at opposite
end.
14.Insert spring and retainer into master cylinder
bore.
15.Insert piston and seal assembly, ensuring that
seal lips do not bend back.
16.Reverse 3 and 4, correctly locating circlip.
17.Stretch new rubber boot over push-rod, pack
with rubber grease. Fit securely into locating
groove.
18.Operate push-rod several times to ensure free
movement of internal components.
19.Fit master cylinder.

33CLUTCH
2
OVERHAUL SLAVE CYLINDER
Service repair no - 33.35.07
Overhaul
1.Remove slave cylinder.
See Repair, Slave
Cylinder
Disassemble
2.Withdraw rubber boot.
3.Withdraw push-rod.
4.Remove circlip.
5.Extract piston and seal assembly, applying low
pressure air to fluid inlet if necessary.
6.Withdraw spring.
7.Remove bleed valve.
Inspecting
8.Clean all components thoroughly using new
hydraulic fluid, and dry using lint-free cloth.
9.Examine cylinder bore and piston which must be
free from corrosion, scores and ridges.
10.Replace seal and rubber boot using appropriate
repair kit.
Assemble
NOTE: Cleanliness is essential, ensure
hands are free of grease or dirt.
11.Fit bleed valve. Do not overtighten.
12.Lubricate seals, piston and bore using new
hydraulic fluid.
13.Fit seal into piston groove, lip of seal towards
fluid inlet end of cylinder.
14.Enter piston assembly, spring first, into cylinder
bore. Ensure that seal lip does not fold back.
15.Secure with circlip.
16.Fill rubber boot with rubber grease.
17.Reverse removal procedure. 1 to 3.

R380
1
FAULT DIAGNOSIS MANUAL GEARBOX
Symptom - Gear jumps out of engagement (any
forward gear)
1.Check condition and security of transmission
and engine mountings.
2.Check in situ, gear lever and selector
adjustments.
3.In situ, remove gearshift and check selector rail
yoke security.
Also check selector detent spring tension and
both spool retainers.
Suspect internal fault
See remove and overhaul procedure.
4.Check action/operation of main selector rail and
forks.
5.Check condition of synchromesh and gear dog
teeth.
6.Check main and layshaft end floats bearings and
adjustments.
7.Check condition of all gearbox components,
ensure clearances and adjustments are correct
on reassembly.
Symptom - Reverse gear only jumps out of
engagment
1.Check condition and security of transmission
and engine mountings.
2.Check in situ, gear lever and selector
adjustments.
3.In situ, remove gearshift and check selector rail
yoke security.
Also check selector detent spring tension and
both spool retainers.
Suspect internal fault
See remove and overhaul procedure.
4.Check action/operation of main selector rail and
reverse lever.
5.Check condition of reverse gear, angled
bearings and shaft.
6.Check condition of all gearbox components,
ensure clearances and adjustments are correct
on reassembly.Symptom - Excessive force required to engage or
change gear, vehicle stationary or moving.
1.Check lubricant specification and level, if low do
not top up at this stage.
2.In situ, lubricate gear mechanism, and check
selector adjustments.
3.In situ, remove gearshift and check selector rail
is free and that the yoke is secure. Also check
selector detent spring tension and both spool
retainers.
4.Drain lubricant and check for contamination or
metal particles.
Suspect worn synchromesh unit or baulk rings
on affected gears. See remove and overhaul
procedure.
Symptom - Noisy gear engagement, vehicle
stationary.
See CLUTCH, Fault diagnosis, Clutch
Noise - Mechanical Faults
Symptom - Noisy gear selection, vehicle moving.
1.Confirm that clutch operation is satisfactory.
2.Establish which gear/gears is causing noise.
3.Check lubricant specification and level, if low do
not top up at this stage.
4.Drain lubricant and check for contamination or
metal particles.
Suspect worn synchromesh. See remove and
overhaul procedure.
5.Check condition of synchromesh unit, springs
and cones for distortion and wear. Also check
dog teeth for damage and cone mating surface
on gear for signs of overheating.
6.Check condition of all gearbox components,
ensure clearances and adjustments are correct
on reassembly.
Symptom - Noise from gearbox in neutral, which
changes tone or becomes worse when clutch is
depressed.
See CLUTCH, Fault diagnosis, Clutch
Noise - Mechanical Faults