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CLUTCH
CL
GI
SECTION MA
EM
LC
CONTENTS
EC
PRECAUTIONS AND PREPARATION....................... 2 HYDRAULIC CLUTCH CONTROL ............................ 7
Precautions ............................................................. 2 Clutch Master Cylinder ........................................... 7
Special Service Tools.............................................. 2 Operating Cylinder .................................................. 8 FE
Commercial Service Tools ...................................... 2 CLUTCH RELEASE MECHANISM ............................ 9
NOISE, VIBRATION AND HARSHNESS (NVH) CLUTCH DISC AND CLUTCH COVER ................... 11
TROUBLESHOOTING ................................................ 3 Clutch Disc............................................................ 11
CL
NVH Troubleshooting Chart.................................... 3 Clutch Cover and Flywheel................................... 12
CLUTCH SYSTEM -- Hydraulic Type ...................... 4 SERVICE DATA AND SPECIFICATIONS (SDS) ..... 13 MT
INSPECTION AND ADJUSTMENT ............................ 5 General Specifications .......................................... 13
Adjusting Clutch Pedal............................................ 5 Inspection and Adjustment.................................... 13
Bleeding Procedure ................................................ 6 AT
FA
RA
BR
ST
RS
BT
HA
EL
IDX
PRECAUTIONS AND PREPARATION
Precautions
q Recommended fluid is brake fluid DOT 3.
q Never reuse drained brake fluid.
q Be careful not to splash brake fluid on painted areas; it
may cause paint damage. If brake fluid is splashed on
painted areas, wash it away with water immediately.
q Use flare nut wrench when removing and installing
clutch piping.
q Use new brake fluid to clean or wash all parts of mas-
ter cylinder and operating cylinder.
SBR686C
q Never use mineral oils such as gasoline or kerosene.
They will ruin the rubber parts of the hydraulic system.
WARNING:
After cleaning clutch disc, wipe it with a dust collector. Do
not use compressed air.
Special Service Tools
The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.
Tool number
(Kent-Moore No.) Description
Tool name
ST20630000 Installing clutch cover and clutch disc
(J26366)
Clutch aligning bar
a: 15.8 mm (0.622 in) dia.
b: 22.9 mm (0.902 in) dia.
NT405 c: 45.0 mm (1.772 in)
ST20050240 Adjusting unevenness of diaphragm spring
( -- ) of clutch cover
Diaphragm spring
adjusting wrench
a: 150 mm (5.91 in)
NT404 b: 25 mm (0.98 in)
Commercial Service Tools
Tool name Description
1 Flare nut crowfoot Removing and installing clutch piping
2 Torque wrench
NT360 a: 10 mm (0.39 in)
CL-2
Reference page
(Possible Cause)
SUSPECTED PARTS
Clutch slips
Symptom Clutch noisy
Clutch pedal spongy
Clutch grabs/chatters
Clutch does not disengage
1
1
CLUTCH PEDAL (Free play out of adjustment) CL-5
2
1
CLUTCH LINE (Air in line) CL-6
3
2
MASTER CYLINDER PISTON CUP (Damaged) CL-7
4
2
OPERATING CYLINDER PISTON CUP (Damaged) CL-8
1
ENGINE MOUNTING (Loose) Refer to EM section
inspection. If necessary, repair or replace these parts.
CL-3
1
RELEASE BEARING (Worn, dirty or damaged) CL-9
5
CLUTCH DISC (Out of true) CL-11
2
5
CLUTCH DISC (Runout is excessive) CL-11
5
CLUTCH DISC (Lining broken) CL-11
5
CLUTCH DISC (Dirty or burned) CL-11
2
2
5
CLUTCH DISC (Oily) CL-11
NVH Troubleshooting Chart
2
2
CLUTCH DISC (Worn out) CL-11
2
CLUTCH DISC (Hardened) CL-11
5 CLUTCH DISC (Lack of spline grease) CL-11
3
6
DIAPHRAGM SPRING (Damaged) CL-12
2
6
DIAPHRAGM SPRING (Out of tip alignment) CL-12
NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING
4
7
CLUTCH COVER (Distortion) CL-12
5
FLYWHEEL (Discoloration) CL-12
Use the chart below to help you find the cause of the symptom. The numbers indicate the order of
GI
AT
EL
FE
ST
FA
BT
LC
RS
EC
RA
CL
HA
BR
MT
EM
MA
IDX
CLUTCH SYSTEM -- Hydraulic Type
ACL083
CL-4
INSPECTION AND ADJUSTMENT
Adjusting Clutch Pedal
1. Adjust pedal height with pedal stopper bolt or ASCD clutch
switch. GI
Pedal height ``H'':
168 - 178 mm (6.61 - 7.01 in)
MA
EM
LC
EC
FE
CL
ACL055
MT
2. Adjust pedal free play with master cylinder push rod. Then
tighten lock nut.
Pedal free play ``A'': AT
9 - 16 mm (0.35 - 0.63 in)
q Push or step on the clutch pedal until resistance is felt, and
check the distance the pedal moves. FA
RA
SCL702
BR
3. Adjust clearance ``C'' shown in the figure while fully
depressing clutch pedal fully.
Clearance ``C'': ST
0.1 - 1.0 mm (0.004 - 0.039 in)
RS
BT
HA
EL
IDX
ACL044
CL-5
INSPECTION AND ADJUSTMENT
Adjusting Clutch Pedal (Cont'd)
Bleeding Procedure
Bleed air from clutch piping connector and then operating
cylinder.
1. Fill master cylinder reservoir tank with new brake fluid.
2. Connect a transparent vinyl hose to air bleeder.
3. Slowly depress clutch pedal to its full stroke length and
release it completely. Repeat this operation several times at
two to three second intervals.
4. Open air bleeder with clutch pedal fully depressed.
ACL058
5. Close air bleeder.
6. Release clutch pedal and wait at least five seconds.
7. Repeat steps 3 through 6 above until air bubbles no longer
appear in brake fluid.
SCL513
CL-6
HYDRAULIC CLUTCH CONTROL
Clutch Master Cylinder
GI
MA
EM
LC
EC
FE
CL
MT
AT
FA
RA
WCL001
BR
DISASSEMBLY AND ASSEMBLY ST
q Use a screwdriver to remove stopper ring while pushing
push rod into cylinder.
q When installing stopper ring, tap in lightly while pushing RS
push rod into cylinder.
BT
INSPECTION
Check the following items, and replace if necessary:
q Rubbing surface of cylinder and piston, for uneven wear, HA
rust or damage
q Piston with piston cup, for wear or damage
q Return spring, for wear or damage EL
q Dust cover, for cracks, deformation or damage
q Reservoir, for deformation or damage
IDX
CL-7
HYDRAULIC CLUTCH CONTROL
Operating Cylinder
WCL002
INSPECTION
Check the following items, and replace if necessary:
q Rubbing surface of cylinder and piston, for uneven wear,
rust or damage
q Piston with piston cup, for wear or damage
q Piston spring, for wear or damage
q Dust cover, for cracks, deformation or damage
CL-8
CLUTCH RELEASE MECHANISM
GI
MA
EM
LC
EC
FE
CL
MT
AT
WCL003
INSPECTION FA
Check the following items, and replace if necessary:
q Release bearing, to see that it rolls freely and is free from RA
noise, cracks, pitting or wear
q Release sleeve and withdrawal lever rubbing surface, for
wear, rust or damage BR
ST
RS
BT
HA
EL
IDX
CL-9
CLUTCH RELEASE MECHANISM
WCL004
LUBRICATION
q Apply recommended grease to contact surface and rubbing
surface.
q Too much lubricant might damage clutch disc facing.
q Wipe lubricant from surface end of spline.
CL-10
CLUTCH DISC AND CLUTCH COVER
GI
MA
EM
LC
EC
FE
CL
WCL012
MT
Clutch Disc
INSPECTION
AT
Check the following items, and replace if necessary:
q Clutch disc, for burns, discoloration, oil or grease leakage
q Clutch disc, for wear of facing FA
Wear limit of facing surface to rivet head:
0.3 mm (0.012 in)
RA
ACL063
BR
q Clutch disc, for backlash of spline and runout of facing.
Maximum backlash of spline (at outer edge of
disc): ST
0.9 mm (0.035 in)
Runout limit:
1.0 mm (0.039 in) RS
Distance of runout check point (from hub center)
107.5 mm (4.23 in)
BT
ACL064
HA
INSTALLATION
q Apply recommended grease to contact surface of splines.
q Too much lubricant might damage clutch facing. EL
IDX
CL-11
CLUTCH DISC AND CLUTCH COVER
Clutch Cover and Flywheel
INSPECTION AND ADJUSTMENT
q Check clutch cover while installed on vehicle, for uneven
diaphram spring toe height.
Uneven limit:
0.7 mm (0.028 in)
q If out of limit, adjust the height with Tool.
ACL065
FLYWHEEL INSPECTION
CAUTON:
Do not allow any magnetic materials to contact the ring
gear teeth.
q Inspect contact surface of flywheel for slight burns or dis-
coloration. Clean flywheel with emery paper.
q Check flywheel runout.
Maximum allowable runout:
Refer to EM-46 section (``Inspection'', ``CYLIN-
DER BLOCK'').
AEM100
INSTALLATION
q Insert Tool into clutch disc hub when installing clutch cover
and disc.
q Be careful not to allow grease to contaminate clutch facing.
q Tighten bolts in numerical order, in two steps.
First step:
: 10 - 20 N m (1.0 - 2.0 kg-m, 7 - 14 ft-lb)
Final step:
: 22 - 29 N m (2.2 - 3.0 kg-m, 16 - 21 ft-lb)
ACL086
CL-12
SERVICE DATA AND SPECIFICATIONS (SDS)
General Specifications
CLUTCH CONTROL SYSTEM CLUTCH DISC Unit: mm (in)
GI
Type of clutch control Hydraulic Model 225
Facing size (Outer dia. x inner dia. 225 x 150 x 3.5
x thickness) (8.86 x 5.91 x 0.138)
MA
7.9 - 8.3 (0.311 - 0.327)
CLUTCH MASTER CYLINDER Thickness of disc assembly
with 4,904 N
With load
(500 kg, 1,103 lb)
Inner diameter mm (in) 15.87 (5/8) EM
CLUTCH OPERATING CYLINDER CLUTCH COVER LC
Inner diameter mm (in) 19.05 (3/4) Model 225
Full-load N (kg, lb) 4,904 (500, 1,103) EC
FE
Inspection and Adjustment CL
CLUTCH PEDAL Unit: mm (in) CLUTCH DISC Unit: mm (in)
Pedal height ``H''*1 168 - 178 (6.61 - 7.01) Model 225 MT
Pedal free play ``A'' (at pedal pad) 9 - 16 (0.35 - 0.63) Wear limit of facing surface to
0.3 (0.012)
rivet head
Clearance ``C'' (between pedal
stopper rubber and clutch interlock 0.1 - 1.0 (0.004 - 0.039) Runout limit of facing 1.0 (0.039) AT
switch)*2
Distance of runout check
*1: Measured from surface of dash reinforcement panel 107.5 (4.23)
point (from hub center)
*2: Clutch pedal fully depressed FA
Maximum backlash of spline
0.9 (0.035)
(at outer edge disc)
RA
CLUTCH COVER Unit: mm (in)
Model 225
BR
Uneven limit of diaphragm spring
0.7 (0.028)
toe height
ST
RS
BT
HA
EL
IDX
CL-13
NOTES
CL-14
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