Clutch Cover And Disc Runout; Clutch Diagnosis Charts - Jeep cherokee 2000 Service Manual

XJ
DIAGNOSIS AND TESTING (Continued)

CLUTCH COVER AND DISC RUNOUT

Check the clutch disc before installation. Axial
(face) runout of a new disc should not exceed 0.50
mm (0.020 in.). Measure runout about 6 mm (1/4 in.)
from the outer edge of the disc facing. Obtain
another disc if runout is excessive.
Check condition of the clutch before installation. A
warped cover or diaphragm spring will cause grab
and incomplete release or engagement. Be careful
when handling the cover and disc. Impact can distort
the cover, diaphragm spring, release fingers and the
hub of the clutch disc.
Use an alignment tool when positioning the disc on
the flywheel. The tool prevents accidental misalign-
ment which could result in cover distortion and disc
damage.
A frequent cause of clutch cover distortion (and
consequent misalignment) is improper bolt tighten-
ing.
CONDITION
Disc facing worn out
Clutch disc facing contaminated with
oil, grease, or clutch fluid.
Clutch is running partially
disengaged.
Flywheel below minimum thickness
specification.
Clutch disc, cover and/or diaphragm
spring warped or distorted.

CLUTCH DIAGNOSIS CHARTS

The clutch inspection chart (Fig. 8) outlines items
to be checked before and during clutch installation.
Use the chart as a check list to help avoid overlook-
ing potential problem sources during service opera-
tions.
The diagnosis charts describe common clutch prob-
lems, causes and correction. Fault conditions are
listed at the top of each chart. Conditions, causes and
corrective action are outlined in the indicated col-
umns.
The charts are provided as a convenient reference
when diagnosing faulty clutch operation.
DIAGNOSIS CHART
POSSIBLE CAUSES
1. Normal wear.
2. Driver frequently rides (slips) the
clutch. Results in rapid overheating
and wear.
3. Insufficient clutch cover
diaphragm spring tension.
1. Leak at rear main engine seal or
transmission input shaft seal.
2. Excessive amount of grease
applied to the input shaft splines.
3. Road splash, water entering
housing.
4. Slave cylinder leaking.
1. Release bearing sticking or
binding and does not return to the
normal running position.
1. Improper flywheel machining.
Flywheel has excessive taper or
excessive material removal.
1. Rough handling. Impact bent
cover, spring, or disc.
2. Improper bolt tightening
procedure.
CLUTCH
CORRECTION
1. Replace cover and disc.
2. Replace cover and disc.
3. Replace cover and disc.
1. Replace appropriate seal.
2. Remove grease and apply the
correct amount of grease.
3. Replace clutch disc. Clean clutch
cover and reuse if in good condition.
4. Replace hydraulic clutch linkage.
1. Verify failure. Replace the release
bearing and transmission front
bearing retainer as necessary.
1. Replace flywheel.
1. Replace disc or cover as
necessary.
2. Tighten clutch cover using proper
procedure.
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