Clutch Components-Removal, Inspection And Installation - Jeep cherokee 1989 Owner's Manual

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release cylinder) and the clutch release (or throwout) bearing. Later
models use a hydraulic release bearing, which is a combination release
bearinglslave cylinder assembly mounted inside the clutch housing.
3 When pressure is applied to the clutch pedal to release the clutch,
hydraulic pressure is exerted against the release bearing, either through
the release lever or the hydraulic release bearing. The bearing pushes
against the fingers of the diaphragm spring of the pressure plate
assembly, which in turn releases the clutch plate.
4 Terminology can be a problem when discussing the clutch com-
ponents because common names are in some cases different from
those used by the manufacturer. For example, the driven plate is also
called the clutch plate or disc, the clutch release bearing is sometimes
called a throwout bearing, the release cylinder is sometimes called the
operating or slave cylinder.
5 Other than to replace components with obvious damage, some
preliminary checks should be performed to diagnose clutch problems.
The first check should be of the fluid level in the clutch master
cylinder. If the fluid level is low, add fluid as necessary and inspect
the hydraulic system for leaks. If the master cylinder reservoir
has run dry, bleed the system as described in Section 8 and retest
the clutch operation.
To check "clutch spin down time," run the engine at normal idle
speed with the transmission in Neutral (clutch pedal up
engaged). Disengage the clutch (pedal down), wait several
seconds and shift the transmission into Reverse. No grinding
noise should be heard. A grinding noise would most likely indicate
a problem in the pressure plate or the clutch disc (assuming the
transmission is in good condition).
To check for complete clutch release, run the engine (with the
parking brake applied to prevent movement) and hold the clutch
pedal approximately 112-inch from the floor. Shift the transmis-
sion between 1st gear and Reverse several times. If the shift is
rough, component failure is indicated. Check the release cylinder
With the clutch pedal depressed completely, the release cylinder
level in the clutch master cylinder.
Visually inspect the pivot bushing at the top of the clutch pedal
to make sure there is no binding or excessive play.
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3 Clutch components removal. inspection and installation
Warning: Dust produced b y clutch wear and deposited on clutch com-
ponents may contain asbestos, which is hazardous to your health. DO
NOT blow it out with compressed air and DO NOT inhale it. DO NOT
use gasoline or petroleum-based solvents to remove the dust. Brake
system cleaner should be used to flush the dust into a drain pan. After
the clutch components are wiped clean with a rag, dispose of the con-
taminated rags and cleaner in a covered, marked container.
Removal
Refer to illustration 3.5
1 Access to the clutch components is normally accomplished by
removing the transmission, leaving the engine in the vehicle. If, of
course, the engine is being removed for major overhaul, then check
the clutch for wear and replace worn components as necessary.
However, the relatively low cost of the clutch components compared
to the time and trouble spent gaining access to them warrants their
replacement anytime the engine or transmission is removed, unless
they are new or in near perfect condition. The following procedures
are based on the assumption the engine will stay in place.
Referring t o Chapter 7 Part A, remove :he transmission from the
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vehicle. Support the engine while the transmission is out. Preferably,
an engine hoist should be used to support it from above. However,
if a jack is used underneath the engine, make sure a piece of wood
is positioned between the jack and oil pan to spread the load. Caution:
The pickup for the oil pump is very close to the bottom of the oilpan.
occur.
3 Remove the release cylinder (models with externally mounted
cylinders) (see Section 7). On models with a hydraulic release bearing
assembly, disconnect the hydraulic line at the clutch housing.
4 To support the clutch disc during removal, install a clutch alignment
tool through the clutch disc hub.
5
Carefully inspect the flywheel and pressure plate for indexing
The Motor Manual Guy
Chapter 8 Clutch and drivetrain
marks. The marks are usually an X, an 0 or a white letter. If they cannot
be found, scribe marks yourself so the pressure plate and the flywheel
will be in the same alignment during installation (see illustration).
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flywheel bolts. Work in a criss-cross pattern until all spring pressure
is relieved. Then hold the pressure plate securely and completely
remove the bolts, followed by the pressure plate and clutch disc.
Refer to illustrations 3.8, 3. 10 and 3. 12
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to wear of the clutch driven plate assembly (clutch disc). However,
all components should be inspected at this time.
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obvious defects (see illustration). If the imperfections are slight, a
machine shop can machine the surface flat and smooth, which is highly
recommended regardless of the surface appearance. Refer t o Chapter
2 for the flywheel removal and installation procedure.
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doesn't, check the fluid
it
3.5
(arrow) (in case you are going to reuse the same pressure plate)
(dark colored areas) and other obvious defects; resurfacing by
Turning each bolt a little at a time, loosen the pressure plate-to..
Ordinarily, when a problem occurs in the clutch,
Inspect the flywheel for cracks, heat checking, grooves and other
Mark the relationship of the pressure plate to the flywheel
3.8 Check the surface of the flywheel for cracks, hot spots
a machine shop will correct minor defects
this flywheel is in fairly good condition; however, resurfacing
is always a good idea
it can be attributed
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the surface on