Jeep Cherokee 2000 Service Manual - page 233
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.
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
CONDITION
POSSIBLE CAUSES
CORRECTION
Disc facing worn out
1. Normal wear.
1. Replace cover and disc.
2. Driver frequently rides (slips) the
clutch. Results in rapid overheating
and wear.
2. Replace cover and disc.
3. Insufficient clutch cover
diaphragm spring tension.
3. Replace cover and disc.
Clutch disc facing contaminated with
oil, grease, or clutch fluid.
1. Leak at rear main engine seal or
transmission input shaft seal.
1. Replace appropriate seal.
2. Excessive amount of grease
applied to the input shaft splines.
2. Remove grease and apply the
correct amount of grease.
3. Road splash, water entering
housing.
3. Replace clutch disc. Clean clutch
cover and reuse if in good condition.
4. Slave cylinder leaking.
4. Replace hydraulic clutch linkage.
Clutch is running partially
disengaged.
1. Release bearing sticking or
binding and does not return to the
normal running position.
1. Verify failure. Replace the release
bearing and transmission front
bearing retainer as necessary.
Flywheel below minimum thickness
specification.
1. Improper flywheel machining.
Flywheel has excessive taper or
excessive material removal.
1. Replace flywheel.
Clutch disc, cover and/or diaphragm
spring warped or distorted.
1. Rough handling. Impact bent
cover, spring, or disc.
1. Replace disc or cover as
necessary.
2. Improper bolt tightening
procedure.
2. Tighten clutch cover using proper
procedure.
XJ
CLUTCH
6 - 7
DIAGNOSIS AND TESTING (Continued)