Clutch Slippage Or Inadequate Clutch Linkage Free Play - Jeep 1979 CJ-5 Technical & Service Manual

CLUTCH 2A-3
Check for binding, worn, bent or broken clutch linkage
components. Lubricate or replace as necessary.
(8) If components inspected are in good condition,
proceed to next step. If one or more problems were
discovered and corrected, lower vehicle and repeat step
(1). If chatter is still evident, proceed to next step.
(9) Remove transmission and clutch components as
outlined in this chapter.
NOTE: Whenever the clutch components are removed,
also remove the pilot bushing lubricating wick, soak the
wick in engine oil and reinstall the wick before
assembly.
(10) Check for oil or grease contamination of driven
plate. If contaminated, correct cause of contamination
and replace driven plate.
(11) Check clutch cover for broken or collapsed apply
springs and inspect surface of pressure plate for deep
scoring, cracks, heat checking, or warping (check surface
with straightedge). Replace clutch cover if it exhibits
any of these conditions. Do not replace clutch cover if
cover is in good condition.
(a) Clean oil and dirt from cover with mineral
spirits and allow to air dry.
(b) Sand pressure plate surface lightly with fine
emery cloth.
(c) Lubricate release lever pivots and check re-
lease lever height. Adjust height if necessary.
CAUTION: Apply lubricant to pivots sparingly. Exces-
sive lubrication could result in grease contamination of
the pressure plate and driven plate surfaces.
(12) Inspect crankshaft pilot bushing. Replace bush-
ing if worn, deeply scored, or discolored.
NOTE: Soak replacement bushing in engine oil before
installation.
(13) Inspect condition of splines on transmission
clutch shaft and in driven plate hub. If splines are worn,
galled, chipped or broken, replace clutch shaft or driven
plate. Remove corrosion, rust, or burrs from splines
using oilstone or fine-tooth file. Install driven plate on
clutch shaft. Plate must move freely on shaft.
(14) If all clutch components are in good condition,
proceed to next step. If one or more components were
determined to be faulty, repair as necessary and proceed
to next step.
(15) Check clutch housing alignment as outlined in
this chapter. Correct alignment if necessary and proceed
to next step.
(16) Apply thin film of chassis lubricant to transmis-
sion clutch shaft splines. Do not apply lubricant to shaft
pilot hub.
(17) Install pilot bushing lubricating wick and install
clutch components and transmission. Refer to Clutch
Installation.
NOTE: Do not replace the throwout bearing unless it is
defective or damaged. Refer to Clutch Area Noises.
Clutch Slippage Or Inadequate Clutch Linkage Free Play
Clutch slippage can be described as a condition in
which the engine overspeeds but does not generate any
increase in torque supplied to the wheels. Clutch slip-
page occurs when the driven plate is not gripped firmly
between the flywheel and clutch cover pressure plate
and rotates or slips between them at high torque. Clutch
slippage can occur during initial acceleration or during
subsequent shifts. Check clutch operation as follows:
(1) Block wheels and apply parking brake.
(2) Operate engine until it reaches normal oper-
ating temperature.
(3) Shift transmission into third gear and increase
engine speed to 2000 rpm.
WARNING: Do not permit anyone to stand in front of
the vehicle during this test.
(4) Slowly release clutch pedal until clutch is fully
engaged.
CAUTION: Do not allow the clutch to be engaged for
more than 5 seconds at a time as the clutch components
could be damaged.
(5) If engine stalls within 5 seconds, clutch is not
defective. If engine continues to run, proceed to next
step.
(6) Raise vehicle on hoist. Check clutch linkage for
binding, worn, broken, or bent components. Lubricate or
replace as necessary. If all components inspected are in
good operating condition, proceed to next step.
(7) If one or more problems were discovered and
corrected during inspection in previous step, repeat
steps (1) through (4). If clutch slippage is corrected, stop
repair. If slippage persists, proceed to next step.
(8) Remove transmission and clutch components.
Refer to Clutch Removal.
NOTE: Whenever the transmission is removed, also
remove the pilot bushing lubricating wick, soak the wick
in engine oil, and reinstall the wick before assembly.
(9) Inspect driven plate. If 1/16 inch (1.58 mm) or
less friction material remains above rivet heads, or plate
is severely glazed or contaminated with oil or grease,
replace driven plate.
NOTE: If the driven plate is contaminated, determine
the cause and make correction before proceeding.
(10) Inspect clutch cover. If cover is heat-checked,
has broken or collapsed springs, or exhibits signs of
overheating (e.g., has blue coloration), replace cover. If
cover does not exhibit any of these conditions, do not
replace it.