Flywheel Ring Gear Removal And Installation - Jeep Cherokee 2000 Service Manual

XJ
REMOVAL AND INSTALLATION (Continued)
FLYWHEEL RING GEAR
REMOVAL
(1) Remove the transmission and transfer case.
Refer to Group 21, Transmission and Transfer Case
for removal and installation procedures.
Fig. 17 Clutch Cover (Pressure Plate) View
1 – VEHICLE UNDERBODY
2 – ENGINE SPEED SENSOR
3 – PRESSURE PLATE RETAINING BOLTS
4 – CLUTCH COVER (PRESSURE PLATE)
5 – ENGINE OIL PAN
6 – PRESSURE PLATE RETAINING BOLTS
(2) Remove the clutch cover and disc (Fig. 17).
Refer to clutch cover and disc removal and installa-
tion in this group.
(3) Remove the flywheel. Refer to flywheel removal
and installation in this group.
(4) Mark position of the old gear for alignment ref-
erence. Use a carbide tipped scribe to mark gear loca-
tion on flywheel.
(5) Wear protective goggles or approved safety
glasses.
(6) Remove the old gear by cutting most of the way
through it at one point. Use an abrasive cut off wheel
for this purpose. Break the ring gear at cut with a
hammer and a cold chisel or punch
(7) Ring gear is shrink fit on flywheel. This means
the gear must be expanded by heating in order to
install it.
NOTE: The method of heating and expanding the
new ring gear is extremely important. Every surface
of the gear must be heated at the same time to pro-
duce uniform expansion. An oven or similar
enclosed heating device must be used. Temperature
required for uniform expansion is approximately
350°-375°.
CAUTION: Do not use an oxy/acetylene torch to
remove the old gear, or to heat and expand a new
gear. The high temperature of the torch flame can
cause localized heating that will damage the fly-
wheel. In addition, using the torch to heat a replace-
ment gear will cause
expansion. The torch flame can also anneal the
gear teeth resulting in rapid wear and damage after
installation.
INSTALLATION
(1) Position and install the heated ring gear on the
flywheel:
(a) Wear heat resistant gloves to handle the hot
ring gear.
(b) Align the ring gear on the flywheel evenly.
(c) Use hammer and brass drift to tap ring gear
onto the flywheel.
(d) Seat the ring gear on flywheel
(2) Allow the ring gear to cool down before instal-
lation on the engine. Place flywheel on work bench
and let it cool in normal shop air.
(3) Install the flywheel and torque bolts. Refer to
flywheel removal and installation in this group.
(4) Install the clutch cover and disc (Fig. 18). Refer
to clutch cover and disc removal and installation in
this group.
(5) Install the transmission and transfer case.
Refer to Group 21, Transmission and Transfer Case
for removal and installation procedures.
CAUTION: Do not use water or compressed air to
cool the flywheel. The rapid cooling produced by
water or compressed air will distort or crack the
new gear.
CLUTCH 6 - 7
uneven heating and