Clutch Pedal Pulsation; Clutch Related Vibrations - Jeep J-10 Series 1982 Technical & Service Manual

2A-6 CLUTCH
(b) Sand pressure plate surface lightly using
fine emery cloth.
(c) Lubricate cover release lever pivots with
chassis grease.
NOTE: Apply lubricayit to pivots sparingly. Excessive
lubricant could result in grease contamination ofpres
sure plate and driven plate surfaces.
(8) Check and adjust clutch cover release lever
height as necessary.
NOTE: If the release lever height cannot be adjusted,
the release lever(s) are bent. Replace the clutch cover.
(9) Inspect crankshaft pilot bushing for heavy scor
ing, angular wear pattern, or discoloration. Replace as
necessary. Be sure to soak bushing in engine oil before
installation.
NOTE: If the pilot bushing displays an angular-type
wear pattern, check and correct clutch housing align
ment before proceeding. Refer to Clutch Housing
Alignment.
(10) Inspect condition of splines on transmission
clutch shaft and in driven plate hub. If severely worn,
galled, or corroded, replace clutch shaft or driven plate.
Corrosion, rust, or burrs can be removed from splines
using an oilstone or fine-tooth file. Install driven plate
on clutch shaft. Driven plate must move freely on shaft.
(11) If components inspected in previous steps are in
good condition, proceed to next step. If one or more
problems were discovered during inspection procedure,
repair as necessary and proceed to next step.
(12) Check clutch housing alignment. Refer to Clutch
Housing Alignment. Correct alignment if necessary and
proceed to next step.
(13) Apply thin film of chassis grease to transmis
sion clutch shaft splines. Do not apply grease to shaft
pilot hub.
(14) Install pilot bushing lubricating wick.
(15) Install transmission and clutch components. Re
fer to Clutch Installation.
(16) Lower vehicle.
NOTE: Do not replace the throwout bearing unless ac
tually defective. Refer to Clutch Area Noises.
Clutch Pedal Pulsation
Clutch pedal pulsation can be described as a rapid up-
and-down or pumping-type movement of the pedal that
is not accompanied by any noise. In most cases, pedal
movement is slight and cannot be observed but can be
felt by the driver. However, on occasion, pedal move
ment will be great enough to be visually observed and
cause a noticeable vibration.
Clutch pedal pulsation occurs when the throwout
bearing makes initial contact with the clutch cover re
lease levers (clutch partially disengaged), or at any time
the bearing is in contact with the release levers. Pulsa
tion is usually caused by incorrect clutch release lever
height or clutch housing misalignment. Check clutch
operation as follows.
(1) Start engine, slowly depress clutch pedal until
throwout bearing makes initial contact with clutch re
lease levers, and check for pulsation.
NOTE: Some minor pulsation is normal
(2) Continue to depress clutch pedal while checking
for pulsation until pedal is fully depressed.
(3) If pulsation is not evident or is minor, stop re
pair. If pulsation is very rapid and can be felt through
out vehicle, refer to Clutch-Related Vibrations. If
vehicle displays pulsation symptoms, proceed to next
step.
(4) Remove transmission and clutch components.
Refer to Clutch Removal.
(5) Remove pilot bushing lubricating wick and soak
wick in engine oil.
(6) Inspect clutch cover release levers. If levers are
bent or excessively worn, replace clutch cover and pro
ceed to step (8). If release levers are in good condition,
clean oil and dirt from clutch cover assembly using
mineral spirits, allow assembly to air dry and proceed to
next step.
(7) Sand clutch cover pressure plate surface lightly
using fine emery cloth.
(8) Lubricate clutch cover release lever pivots
lightly with chassis grease.
NOTE: Apply lubricant to the pivots sparingly. Exces
sive lubrication could result in grease contamination of
the driven plate and pressure plate surface.
(9) Check and adjust clutch cover release lever
height if necessary.
NOTE: If release lever height cannot be adjusted, the
levers are bent and the cover must be replaced.
(10) Check clutch housing alignment. Refer to Clutch
Housing Alignment. Correct alignment if necessary and
proceed to next step.
(11) Apply thin film of chassis grease to transmis
sion clutch shaft splines but do not apply grease to shaft
pilot hub.
(12) Install pilot bushing lubricating wick.
(13) Install clutch components and transmission. Re
fer to Clutch Installation.
Clutch Related Vibrations
Clutch related vibrations differ from pedal pulsations
in frequency and magnitude. They usually occur at rela
tively high engine speeds (over 1500 rpm), are not af
fected by clutch pedal position, and can be felt
throughout the vehicle.
Although clutch related vibrations are usually caused
by clutch component imbalance, this condition occurs