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21-8
CLUTCH
(5) Check for
loose flywheel
mounting bolts.
Tighten bolts to 105 foot-pounds (142 N*m) torque if
necessary and operate engine. If vibration ceases, stop
repair. If vibration is still evident, proceed to next step.
(6) Check flywheel face runout while holding crank-
shaft end play to zero. If runout is 0.005 inch (0.12 mm)
or less, proceed to next step. If runout exceeds 0.005 inch
(0.12 mm), replace flywheel and operate engine. If vibra-
tion ceases, stop repair. If vibration is still evident,
proceed to next step.
(7) Check for damaged crankshaft vibration damp-
ener. If dampener is in good condition, proceed to next
step. If dampener is damaged, replace dampener and
operate, engine. If vibration ceases, stop repair. If vibra-
tion is still evident, proceed to next step.
(8) Check clutch cover imbalance as follows:
(a) Remove clutch cover and driven plate from
flywheel.
(b) Start and operate engine at speed where
vibration, occured.
(c) If vibration ceases, replace clutch cover and
recheck operation. If now OK, install clutch housing and
transmission. Refer to Clutch Installation.
(9) Lower vehicle.
Oiyfeli Noises
Throwout Bearing Noise
Throwout bearing noises can be described as whirring,
grating, or grinding noises that occur when the clutch
pedal is depressed (clutch disengaged).
These noises usually continue until the clutch pedal is
fully released (clutch engaged) and the bearing is no
longer in contact with the clutch cover release levers.
Throwout bearing noise is corrected by replacing the
bearing as outlined in this chapter.
N O T E : The throwout bearing should not be replaced as
a mutter of course when servicing the clutch cover or
driven plate. Replace the bearing only if defective.
Transmission Clutch
Shift
or Countershaft Bearing Note
Transmission clutch shaft or countershaft bearing
noises can be described as whirring, grating, or grinding
noises which cease when the clutch pedal is depressed
(clutch disengaged) or when the transmission is shifted
into gear. These noises are most noticeable when the
clutch pedal is fully released and the transmission is in
neutral. Correction of these noises will require trans-
mission removal and replacement of the problem
bearing(s).
Crankshaft Pilot Bushing Noise
Pilot bushing noises can be described as squealing,
howling, or elephant-type trumpeting noises which are
most noticeable when the engine is cold. These noises
occur during the first few inches of clutch pedal travel
as the pedal is being released (partial clutch engage-
ment) with the transmission in gear. It can also occur in
very cold weather when the pedal is fully depressed
(clutch disengaged) and the engine is started with the
transmission in neutral. To correct pilot bushing noise,
replace bushing as outlined in this section.
CLUTCH ADJUSTMENTS
There are two clutch adjustments required: clutch
pedal free play and clutch cover release lever height.
Clutch pedal free-play should be checked and adjusted
at the intervals specified in the Mechanical Maintai-
nence Schedule, Chapter B, or whenever diagnosis in-
dicates adjustment is needed. Refer to Clutch Pedal Free
Play Adjustment in this section.
Clutch cover release lever height should be checked
and adjusted whenever the cover is removed or replaced
during service operations, or whenever diagnosis in-
dicates adjustment is needed. Refer to the Clutch Serv-
ice section in this chapter.
CLUTCH PEDAL FREE PLAY ADJUSTMENT
(1) Lift clutch pedal upward and against pedal stop
(fig.2A-3andfig.2A-4).
(2) Raise vehicle.
(3) On Cherokee and Truck models, adjust clutch
push rod lower ball pivot assembly in-or-out on push rod
(fig. 2A-4) until bellcrank inner lever is parallel to front
face of clutch housing. Lever should be slightly forward
from vertical.
(4) Loosen release rod adjuster jamnut.
(5) Turn release rod adjuster in or out to obtain
specified clutch pedal free play.
. (6) Tighten release rod jamnut.
(7) Lower vehicle.
CLUTCH LINKAGE
The suspended-type clutch pedal is connected to the
throwout lever through the clutch push rod, bellcrank
outer and inner levers, and release rod (fig. 2A-3 and fig.
2A-4). The throwout bearing is mounted on the trans-
mission front bearing cap and acts directly against the
clutch cover release levers to engage and disengage the
clutch. The bearing is actuated by a throwout lever
mounted in the clutch housing. The lever pivots on a
steel ball mounted inside the clutch housing.
The bellcrank pivots on ball studs mounted in the
inner and outer support brackets (fig. 2A-3 and fig. 2A-
4). Idler bushings, installed in each end of the bellcrank
provide bearing surfaces for the ball studs.
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Troubleshooting
