Isuzu N-Series. Manual — part 881
7B1-48 MANUAL TRANSMISSION (MZZ)
SPECIAL TOOLS
Special Tools
Illustration
Tool Number /
Description / Remarks
9-8529-2101-0 / Drive
Pinion Flange Bracket
5-8840-2751-0 / Oil Seal
Installer
5-8840-0027-0 / Bearing
Remover
5-8840-0084-0 / Sliding
Hammer
5-8840-2755-0 / Bush
Remover & Installer
5-8840-2558-0 / Oil Seal
Installer
9852921010
5884027510
5884000270
5884000840
5884027550
5884025580
5-8840-2244-0 / Bearing
Installer
5-8840-0007-0 / Driver
Handle
5-8840-2753-0 / Bearing
Installer
5-8840-2345-0 / Clutch
Hub & Collar Installer
5-8840-2245-0 / Oil Seal
Installer
Illustration
Tool Number /
Description / Remarks
5884022440
5884000070
5884027530
5884023450
5884022450
CLUTCH (FOR MZZ TRANSMISSION) 7C-1
MANUAL TRANSMISSION AND CLUTCH
MZZ SERIES
SECTION 7C
CLUTCH (FOR MZZ TRANSMISSION)
Contents
DESCRIPTION. . . . . . . . . . . . . ..7C-2
Clutch System . . . . . . . . . . . . ...7C-2
DIAGNOSIS OF CLUTCH. . . . . . . . . .7C-3
ON-VEHICLE SERVICE . . . . . . . . . ...7C-6
COMPONENT PARTS REPLACEMENT. . . ..7C-8
Clutch Assembly. . . . . . . . . . . . 7C-8
Clutch Controls . . . . . . . . . . . . 7C-13
UNIT REPAIR . . . . . . . . . . . . . .7C-15
Master Cylinder . . . . . . . . . . . ...7C-15
Slave Cylinder . . . . . . . . . . . . .7C-17
SPECIFICATIONS . . . . . . . . . . . ..7C-19
Specifications . . . . . . . . . . . . ..7C-19
Fixing Torque. . . . . . . . . . . . ...7C-19
7C-2 CLUTCH (FOR MZZ TRANSMISSION)
DESCRIPTION
Clutch System
Notice:
When fasteners are removed, always reinstall them at
the same location from which they were removed. If a
fastener needs to be replaced, use the correct part num-
ber fastener for that application. If the correct part num-
ber fastener is not available, a fastener of equal size and
strength (or stronger) may be used. Fasteners that are
not reused, and those requiring thread locking com-
pound will be called out. The correct torque value must
be used when installing fasteners that require it. If the
above conditions are not followed, parts or system dam-
age could result.
Driving Members
The driving members of a clutch usually consist of two
flat surfaces machined to a smooth finish.
One of these surfaces is usually the rear face of the en-
gine flywheel, and the other is a comparatively heavy flat
ring with one side machined. This part is known as the
pressure plate. It is fitted into a steel cover, which also
contains some of the operating members, and is bolted
to the flywheel.
Driven Member
The driven member is a clutch disc with a splined hub
which is free to slide lengthwise along the splines of the
clutch shaft, but which drives the shaft through these
same splines. Suitable frictional facings are attached to
each side of the clutch disc by means of rivets. These
facings must be heat resistant since friction produces
heat.
Operating Members
The driving and driven members are held in contact by
spring pressure.
The throwout (clutch release) bearing is a ballthrust
bearing contained in the clutch housing, mounted on a
sleeve attached to the front of the transmission case.
The throwout bearing is moved by the clutch release
yoke to contact the release levers and move the pres-
sure plate to the rear, thus separating the clutch driving
members from the driven member when the clutch pedal
is depressed by the driver.
Clutch Controls
This system utilizes hydraulic pressure as a means of
transmitting clutch pedal movement to the clutch re-
lease mechanism. The system consists of a pedal-oper-
ated master cylinder and a slave cylinder,
interconnected with hydraulic lines. The clutch pedal is
connected to the master cylinder push rod, and the
slave cylinder push rod is connected to the clutch re-
lease fork.
CLUTCH (FOR MZZ TRANSMISSION) 7C-3
DIAGNOSIS OF CLUTCH
PROBLEM
POSSIBLE CAUSE
CORRECTION
Clutch Slips
1. Binding of release levers in the
pressure plate and cover assembly.
1. Replace the clutch cover assembly.
2. Clutch release levers improperly
adjusted.
2. If levers are in place, adjust free pedal.
3. Facings loose on the clutch disc.
3. Replace the driven disc assembly.
4. Improper clutch release bearing ad-
justment.
4. Adjust for proper clearance (free pedal).
5. Binding or sticking clutch pedal as-
sembly.
5. Repair or replace faulty parts.
Check linkage for proper adjustment.
6. Weak or broken clutch pressure
springs.
6. Replace the clutch cover assembly.
7. Burned clutch facings.
7. Replace clutch driven disc assembly
and check flywheel and pressure plate
friction surfaces for damage replace
parts as necessary.
8. Binding or sticking of the clutch disc
hub on the transmission drive gear.
8. Lubricate splines with high temperature
grease (if dry). Replace driven discs if
splined hubs are worn.
9. Release bearing binding on bearing
retainer.
9. Replace release bearing or lubricate.
10. Warped pressure plate or engine
flywheel.
10. Replace defective parts. Check trans-
mission, clutch, and engine alignment.
11. No free pedal.
11. Adjust for free pedal, check clutch driven
disc wear and replace parts as required.
Clutch Chatters During
Engagement
1. Loose engine mounts.
1. Tighten engine mount bolts to specifica-
tions.
2. Grease or oil on facings.
2. Replace driven disc assembly and repair
oil leak.
3. Slight binding in linkage during en-
gagement.
3. Check linkage for wear or damage. Re-
place parts as required.
4. Weak pressure springs.
4. Replace clutch cover assembly.
5. Clutch release levers binding during
engagement.
5. Repair or replace clutch cover assem-
bly.
6. Worn or broken pilot bearing.
6. Replace and lubricate pilot bearing.
7. Rough engine idle.
7. Tune engine to manufacturer's specifi-
cations.
8. Bent or out of plane pressure plate
fingers.
8. Replace clutch cover assembly if re-
lease fingers are more than 2 mm (0.079
in) out of plane.
9. Driven disc warped, cracked, or
loose friction material.
9. Replace driven disc assembly.
10. Pressure plate warped or hot spots. 10. Replace pressure plate or clutch cover
assembly.
11. Flywheel warpage or discoloration.
11. Replace flywheel.
12. Flywheel housing bore and face not
aligned.
12. Correct per alignment procedure.
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст