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7C-2 CLUTCH
GENERAL DESCRIPTION
The clutch is a diaphragm-spring clutch of a dry single disc type. The diaphragm spring is of a tapering-finger
type, which is a solid ring in the outer diameter part, with a series of tapered fingers pointing inward.
The disc, carrying four torsional coil springs, is positioned on the transmission input shaft with an involute spline
fit.
The clutch cover is secured to the flywheel, and carries the diaphragm spring in such a way that the peripheral
edge part of the spring pushes on the pressure plate against the flywheel (with the disc in between), when the
clutch release bearing is held back. This is the engaged condition of the clutch.
Depressing the clutch pedal causes the release bearing to advance and pushes on the tips of the tapered fin-
gers of the diaphragm spring. When this happens, the diaphragm spring pulls the pressure plate away from the
flywheel, thereby interrupting the flow of drive from flywheel through clutch disc to transmission input shaft.
1. Crankshaft 6. Diaphragm spring
2. Flywheel 7. Release bearing
3. Clutch disc 8. Input shaft bearing
4. Pressure plate 9. Input shaft
5. Clutch cover 10. Release shaft
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CLUTCH 7C-3
DIAGNOSIS
Condition Possible Cause Correction
Slipping
Improper clutch pedal free travel Adjust free travel.
Worn or oily clutch disc facing Replace disc.
Warped disc, pressure plate or flywheel surface Replace disc, clutch cover or
flywheel.
Weakened diaphragm spring Replace clutch cover.
Rusted clutch cable Replace cable.
Dragging clutch
Improper clutch pedal free travel Adjust free travel.
Weakened diaphragm spring, or worn spring tip Replace clutch cover.
Rusted input shaft splines Lubricate.
Damaged or worn splines of transmission input shaft Replace input shaft.
Excessively wobbly clutch disc Replace disc.
Clutch facings broken or dirty with oil Replace disc.
Clutch vibration
Glazed (glass-like) clutch facings Repair or replace disc.
Clutch facings dirty with oil Replace disc.
Release bearing slides unsmoothly on input shaft
bearing retainerLubricate or replace input
shaft bearing retainer.
Wobbly clutch disc, or poor facing contact Replace disc.
Weakened torsion springs in clutch disc Replace disc.
Clutch disc rivets loose Replace disc.
Distorted pressure plate or flywheel surface Replace clutch cover or fly-
wheel.
Weakened engine mounting or loosened engine
mounting bolt or nutRetighten or replace mount-
ing.
Noisy clutch
Worn or broken release bearing Replace release bearing.
Input shaft front bearing worn down Replace input shaft bearing.
Excessive rattle of clutch disc hub Replace disc.
Cracked clutch disc Replace disc.
Pressure plate and diaphragm spring rattling Replace clutch cover.
Grabbing clutch
Clutch disc facings soaked with oil Replace disc.
Clutch disc facings excessively worn Replace disc.
Rivet heads showing out of facing Replace disc.
Weakened torsion springs Replace disc.
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7C-6 CLUTCH
CLUTCH PEDAL AND CLUTCH PEDAL BRACKET
1. Clutch cable hook
: Apply grease 99000-25010 to cable
hook.7. Pedal spring
: Apply grease 99000-25010 to inside surface
of spring.13. Adjusting bolt cap
2. Clutch pedal bracket 8. Pedal shaft spacer
: Apply grease 99000-25010 to outside sur-
face of spacer.14. Adjusting bolt
3. Bolt 9. Pedal shaft 15. Lock nut
4.
Nut10.
Clutch pedalTightening torque
5. Pedal shaft nut 11. Pedal pad
6. Pedal bush 12. Pedal return cushion
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7C-8 CLUTCH
UNIT REPAIR OVERHAUL
CLUTCH COVER, CLUTCH DISC AND FLYWHEEL
REMOVAL
1) Dismount transmission assembly referring to Section 7A.
2) Hold flywheel stationary with special tool (A) and remove
clutch cover bolts (1), clutch cover (2) and clutch disc.
Special tool
(A) : 09924-17810
1. Flywheel7. Release bearing
: Apply grease 99000-25010 to joint of bearing and release
shaft and also bearing inside. (0.3 g)
2. Clutch release shaft seal
: Apply grease 99000-25010 to seal lip. (0.3 g)8. Clutch cover
3. Clutch release shaft No.2 bush
: Apply grease 99000-25010 to bush inside. (0.3 g)9. Clutch disc
4. Return spring 10. Clutch cover bolt
5. Clutch release shaft
Apply grease 99000-25010 to the end of release shaft arm. (0.3 g)Tightening torque
6. Clutch release shaft No.1 bush
: Apply grease 99000-25010 to bush inside. (0.3 g)Do not reuse.
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CLUTCH 7C-9
3) Pull out input shaft bearing (1) by using special tool (B), and
wrench.
Special tool
(B) : 09921-26020
09930-30104
INSPECTION
Input Shaft Bearing
Check bearing (1) for smooth rotation and replace it if abnormality
is found.
Clutch Disc
Measure depth of rivet head depression, i.e. distance between
rivet head and facing surface. If depression is found to have
reached service limit at any of holes, replace disc assembly.
Rivet head depth
Standard : 1.65 – 2.25 mm (0.06 – 0.09 in.)
Service limit : 0.5 mm (0.02 in.)
Clutch Cover
1) Check diaphragm spring (1) for abnormal wear or damage.
2) Inspect pressure plate (2) for wear or heat spots.
3) If abnormality is found, replace it as assembly. Do not disas-
semble it into diaphragm and pressure plate.
Flywheel
Check surface contacting clutch disc for abnormal wear or heat
spots. Replace or repair as required.
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7C-10 CLUTCH
INSTALLATION
1) Install flywheel (1) to crankshaft and tighten bolts (2) to spec-
ification.
Special tool
(A) : 09924-17810
Tightening torque
Flywheel bolts (a) : 70 N·m (7.0 kg-m, 50.5 lb-ft)
2) Using special tool, install input shaft bearing to flywheel.
Special tool
(B) : 09925-98210
3) Aligning clutch disc to flywheel center by using special tool,
install clutch cover (1) and bolts. Then tighten bolts to speci-
fication.
Special tool
(A) : 09924-17810
(C) : 09923-36320
Tightening torque
Clutch cover bolts (b) : 23 N·m (2.3 kg-m, 16.5 lb-ft) NOTE:
Before assembling, make sure that flywheel surface and
pressure plate surface have been cleaned and dried thor-
oughly.
NOTE:
While tightening clutch cover bolts, compress clutch
disc with special tool (C) by hand so that disc cen-
tered.
Tighten cover bolts little by little evenly in diagonal
order.
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CLUTCH 7C-11
4) Slightly apply grease to input shaft (1), then join transmission
assembly with engine. Refer to Section 7A for remounting
procedure.
“A” : Grease, 99000-25210
CLUTCH RELEASE SYSTEM
REMOVAL
1) Remove release lever by loosening its bolt.
2) Take out release bearing by turning release shaft (1).
3) Unhook return spring by using pliers.
4) Drive out No.2 bush by using special tool and hammer.
Release shaft seal will also be pushed out.
Special tool
(A) : 09922-46010
5) Remove release shaft and return spring.
6) Install tap (M16 X 1.5) (1) to clutch release shaft No.1 bush.
7) Pull out No.1 bush by using tap (1) and special tools.
Special tool
(B) : 09923-46020
(C) : 09930-30104 NOTE:
When inserting transmission input shaft to clutch disc,
turn crankshaft little by little to match splines.
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7C-12 CLUTCH
INSPECTION
Clutch release bearing
Check clutch release bearing for smooth rotation.
If abnormality is found, replace it.
Clutch release shaft
Check clutch release shaft and its pin for deflection or damage.
If abnormality is found, replace it.
INSTALLATION
1) Drive in a new No.1 bush by using special tools and then
apply grease to bush inside.
Special tool
(A) : 09930-30104
(B) : 09923-46030
“A” : Grease 99000-25010
2) Install release shaft with return spring applied to it.CAUTION:
Do not wash release bearing. Washing may cause grease
leakage and consequential bearing damage.