Pilot Bearing-Inspection And Replacement - Jeep cherokee 1989 Owner's Manual

Removal
1
Following the appropriate procedure outlined in Chapter 7, remove
the transmission.
Externally m o u n t e d release cylinder
2 Unbolt the release cylinder from the clutch housing and pull it out
of its recess. Hang it out of the way with a piece of wire (it's not
necessary to disconnect the hose).
3 Remove the release lever from the ball stud, slide the bearing off
the transmission input shaft bearing retainer and separate the bearing
from the lever.
Release bearing assembly
Refer to illustrations 4.4 and 4.5
4
Unbolt the insulator plate from the clutch housing and slide the
plate and rubber insulator off the lines (see illustration).
5
Remove the pressed metal retaining nut from the base of the
hydraulic release bearing (see illustration) and slide the release bear-
ing assembly off the transmission input shaft bearing retainer.
Inspection
6
Hold the center portion of the bearing stationary and rotate the
outer portion while applying pressure. If the bearing doesn't turn
smoothly or if it's noisy, replace it with a new one. Wipe the bearing
with a clean rag and inspect it for damage and wear. Don't immerse
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the bearing in solvent it is sealed for life and immersion would ruin it.
7 Hydraulic release bearings must also be checked for fluid leakage
where the rubber seal meets the cylinder housing. If any leakage is
evident, replace the entire assembly.
lnstallation
8 Installation for either style bearing is the reverse of the removal
procedure, with a couple of points which must be noted.
9
Lightly lubricate the transmission input shaft bearing retainer with
high-temperature grease. On hydraulic release bearing models, install
a new pressed metal retaining nut. Note: When new, the hydraulic
release bearing is retained in the compressed position by nylon straps
they are designed to break the first time the clutch pedal is depressed,
so there is no need to remove them.
10 With the non-hydraulic release bearing (externally mounted release
cylinder), lubricate the ends of the release lever and the ball socket
with high-temperature grease. Also pack the inner groove of the bearing
with the same grease. When installing the bearing and lever, make sure
the bearing retaining spring clips are engaged with the lever ends.
1 1 Install the transmission (see Chapter 7 ) . On hydraulic release bear-
ing models, connect the hydraulic line and bleed the system as de-
scribed in Section 8.
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5 Pilot bearing
inspection and replacement
Refer to illustrations 5.9, 5. 1 O a and 5. 7 Ob
1 The clutch pilot bearing is a needle roller type bearing which is
pressed into the rear of the crankshaft. Its primary purpose is to support
the front of the transmission input shaft. The pilot bearing should be
inspected whenever the clutch components are removed from the
engine. Due to its inaccessibility, if you are in doubt as to its condition,
replace with a new one. Note: If the engine has been removed from
it
the vehicle, disregard the following steps which do not apply.
2 Remove the transmission (refer t o Chapter 7 Part A).
3 Remove the clutch components (Section 3).
4
Inspect for any excessive wear, scoring, lack of grease, dryness
or obvious damage. If any of these conditions are noted, the Gearing
should be replaced. A flashlight will be helpful to direct light into the
recess.
5 Removal can be accomplished with a special puller and slide ham-
mer, but an alternative method also works very well.
6 Find a solid steel bar which is slightly smaller in diameter than the
bearing. Alternatives to a solid bar would be a wood dowel or a socket
with a bolt fixed in place to make it solid.
7 Check the bar for fit it should just slip into the bearing with very
little clearance.
8 Pack the bearing and the area behind it (in the crankshaft recess)
with heavy grease. Pack it tightly to eliminate as much air as possible.
The Motor Manual Guy
Chapter 8 Clutch and drivetrain
4.4
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5.9
smaller than the bore i n the bearing
strikes the rod, the bearing will pop out of the crankshaft
9
Insert the bar into the bearing bore and strike the bar sharply with
a hammer which will force the grease to the back side of the bearing
and push it out (see illustration). Remove the bearing and clean all
grease from the crankshaft recess.
1 0 To install the new bearing, pack the inside of the bearing and lightly
lubricate the outside surface with wheel bearing grease. Drive the bear-
Remove the bolts (arrows), then slide the insulato~
plate and rubber insulator back on the lines
4.5
Remove the hydraulic release bearing retaining
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nut be sure t o use a new nut upon installation
Pack the recess behind the bearing with heavy grease
and force it out hydraulically with a steel rod slightly
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when the hammer