Jeep 1997 Grand Cherokee Service Manual page 227

ZG
REMOVAL AND INSTALLATION (Continued)
(4) Install and tighten new flywheel bolts as fol-
lows:
(a) Lubricate bolt threads with engine oil.
(b) Install and tighten bolts to initial torque of
20 N·m. Tighten bolts diagonally in pairs (Fig. 10).
(c) Tighten each bolt and additional 60° turn.
Continue tightening bolts in small increments to
final torque of 130 N·m.
(5) Install clutch disc and cover (refer to procedure
in this section).
(6) Install transmission and transfer case.
FLYWHEEL RING GEAR
REMOVAL
(1) Remove the transmission and transfer case.
(Refer to Group 21, Transmission And Transfer
Case.)
(2) Remove the clutch cover.
(3) Remove the clutch plate.
(4) Remove the flywheel.
(5) Mark position of the old gear for alignment ref-
erence. Use a carbide tipped scribe to mark gear loca-
tion on flywheel.
(6) Wear protective goggles or approved safety
glasses.
(7) 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
(8) 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:
uneven heating and
(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 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 flywheel and torque bolts to 130 N m.
(4) Install clutch cover and disc. Refer to procedure
in this section.
(5) Install transmission and transfer case.
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.
SPECIFICATIONS
SPECIFICATIONS
DESCRIPTION
Clutch Cover to Flywheel
Bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 N·m
Clutch Housing to Transmission
Bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 N·m
Flywheel to Crankshaft
Bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130 N·m
Pilot Bearing Retainer to Flywheel/Crankshaft
Bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 N·m
Clutch Housing to Engine
Top (2) Bolts . . . . . . . . . . . . . . . . . . . . . . . 37 N·m
Middle (2) Bolts . . . . . . . . . . . . . . . . . . . . . 58 N·m
Bottom (2) Bolts . . . . . . . . . . . . . . . . . . . . 75 N·m
SPECIAL TOOLS
SPECIAL TOOLS
Universal Handle—C-4171
CLUTCH 6 - 5
TORQUE