2003 CHRYSLER CARAVAN clutch

DISASSEMBLY
WARNING: Differential is only to be serviced as an
assembly, and no disassembly is required.
(1) Remove six torque arm-to-differential case
bolts and remove torque arm assembly (Fig. 4).
(2) Remove input flange nut and washer using
Tool 6958 and a breaker bar (Fig. 5).(3) Remove input flange (Fig. 6).
(4) Remove input flange seal from overrunning
clutch housing using suitable screwdriver (Fig. 7).
Fig. 4 Torque Arm Fasteners
1 - TORQUE ARM ASSEMBLY
2 - BOLT (SIX)
Fig. 5 Input Flange Nut
1 - INPUT FLANGE
2 - TOOL 6958
Fig. 6 Input Flange
1 - INPUT FLANGE/SHIELD
Fig. 7 Input Flange Seal Removal
1 - INPUT FLANGE SEAL
2 - SCREWDRIVER
RSREAR DRIVELINE MODULE3-27
REAR DRIVELINE MODULE (Continued)
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(5) Remove four overrunning clutch housing-to-dif-
ferential assembly bolts (Fig. 8) and remove housing.
(6) Remove front bearing snap ring (Fig. 14).
(7) Remove front bearing (Fig. 14).
(8) Remove o-ring and washer from overrunning
clutch assembly (Fig. 14).
(9) Remove overrunning clutch assembly from vis-
cous coupler (Fig. 9).(10) Remove viscous coupler from differential pin-
ion shaft (Fig. 10).
(11) Remove shim (select) from differential pinion
gear (Fig. 11).
Fig. 8 Overrunning Clutch Housing Bolts
1 - OVERRUNNING CLUTCH HOUSING
2 - BOLT (FOUR)
Fig. 9 Overrunning Clutch
1 - OVERRUNNING CLUTCH
2 - VISCOUS COUPLER
Fig. 10 Viscous Coupler
1 - VISCOUS COUPLER
2 - DIFFERENTIAL PINION
Fig. 11 Shim (Select)
1 - SHIM (SELECT)
2 - DIFFERENTIAL PINION
3 - 28 REAR DRIVELINE MODULERS
REAR DRIVELINE MODULE (Continued)
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(12) Remove overrunning clutch housing large
o-ring from differential assembly (Fig. 14).
(13) Remove output flanges using suitable screw-
drivers and wood blocks to protect casting (Fig. 12).(14) Remove output flange seals (Fig. 13).
ASSEMBLY
(1) Install output flange seals using tools C4171
and 8493 (Fig. 15).
(2) Install large overrunning clutch housing o-ring
to differential assembly (Fig. 14).
(3) Install shim to differential pinion shaft (Fig.
16).
Fig. 12 Output Flange Removal
1 - WOOD BLOCK
2 - PRYBAR
3 - OUTPUT SHAFT
4 - PRYBAR
5 - WOOD BLOCK
6 - DIFFERENTIAL CASE
Fig. 13 Output Flange Seal Removal
1 - OUTPUT FLANGE SEAL
2 - SCREWDRIVER
RSREAR DRIVELINE MODULE3-29
REAR DRIVELINE MODULE (Continued)
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Fig. 14 Drive Line Module
1 - NUT, INPUT FLANGE 6 - BEARING, FRONT 11 - VISCOUS COUPLER
2 - WASHER, INPUT FLANGE NUT 7 - SNAP RING, BEARING RETAINER 12 - O-RING, OVERRUNNING CLUTCH
HOUSING
3 - INPUT FLANGE/SHIELD 8 - O-RING 13 - SHIM (SELECT)
4 - SEAL, INPUT FLANGE 9 - WASHER 14 - DIFFERENTIAL ASSEMBLY
5 - OVERRUNNING CLUTCH HOUSING
BOLT10 - BI-DIRECTIONAL OVERRUNNING
CLUTCH
Fig. 15 Output Flange Seal Installation
1 - DRIVER HANDLE C4171
2 - INSTALLER 8493
Fig. 16 Shim (Select)
1 - SHIM (SELECT)
2 - DIFFERENTIAL PINION
3 - 30 REAR DRIVELINE MODULERS
REAR DRIVELINE MODULE (Continued)
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(4) Install viscous coupler to differential pinion
shaft (Fig. 17).
(5) Install overrunning clutch assembly to viscous
coupler (Fig. 18).
(6) Install washer to overrunning clutch (Fig. 14).
(7) Install o-ring to overrunning clutch (Fig. 14).(8) Align overrunning clutch ground tab to 12
o'clock position (Fig. 19).
(9) Install overrunning clutch housing into posi-
tion, making sure ground tab engages with notch in
housing (Fig. 20).
Fig. 17 Viscous Coupler
1 - VISCOUS COUPLER
2 - DIFFERENTIAL PINION
Fig. 18 Overrunning Clutch
1 - OVERRUNNING CLUTCH
2 - VISCOUS COUPLER
Fig. 19 Grounding Tab at 12 O'clock
1 - OVERRUNNING CLUTCH
2 - GROUND TAB
Fig. 20 Overrunning Clutch Housing
1 - OVERRUNNING CLUTCH HOUSING
2 - NOTCH
RSREAR DRIVELINE MODULE3-31
REAR DRIVELINE MODULE (Continued)
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(10) Install and torque overrunning clutch hous-
ing-to-differential assembly bolts (Fig. 21) to 60 N´m
(44 ft. lbs.).
(11) Install input flange seal using tool 8802 (Fig.
22).(12) Install flange/shield assembly (Fig. 23).
(13) Install input flange washer and nut. Using
tool 6958 (Fig. 24), torque nut to 135 N´m (100 ft.
lbs.).
Fig. 21 Overrunning Clutch Housing Bolts
1 - OVERRUNNING CLUTCH HOUSING
2 - BOLT (FOUR)
Fig. 22 Input Flange Seal Installation
1 - TOOL 8802
2 - HAMMER
Fig. 23 Input Flange/Shield
1 - INPUT FLANGE/SHIELD
Fig. 24 Input Flange Nut
1 - INPUT FLANGE
2 - TOOL 6958
3 - 32 REAR DRIVELINE MODULERS
REAR DRIVELINE MODULE (Continued)
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SPECIFICATIONS - REAR DRIVELINE MODULE
TORQUE SPECIFICATIONS
DESCRIPTION N´m Ft. Lbs. In. Lbs.
Bolt, Driveline Module-to-Body 54 40 Ð
Bolt, Halfshaft-to-Ouput Flange 61 45 Ð
Bolt, Overrunning Clutch Housing-to-Differential 60 44 Ð
Bolt, Torque Arm-to-Differential Assembly 60 44 Ð
Bolt, Torque Arm Mount-to-Body 54 40 Ð
Nut, Input Flange 135 100 Ð
Plug, Differential Drain/Fill 35 26 Ð
Plug, Overrunning Clutch Housing Drain/Fill 30 22 Ð
Vent, Differential/Overrunning Clutch Housing 12 Ð 110
SPECIAL TOOLSBI-DIRECTIONAL
OVERRUNNING CLUTCH
DESCRIPTION
The bi-directional overrunning clutch (BOC) (Fig.
28) works as a mechanical disconnect between the
front and rear axles, preventing torque from being
transferred from the rear axle to the front. The BOC
is a simply an overrunning clutch which works in
both clockwise and counter-clockwise rotations. This
means that when the output (the rear axle) is rotat-
ing faster in one direction than the input (front axle),
there is no torque transmission. But when the input
speed is equal to the output speed, the unit becomes
locked. The BOC provides significant benefits regard-
ing braking stability, handling, and driveline durabil-
ity. Disconnecting the front and the rear driveline
during braking helps to maintain the braking stabil-
ity of an AWD vehicle. In an ABS/braking event, the
locking of the rear wheels must be avoided for stabil-
ity reasons. Therefore brake systems are designed to
lock the front wheels first. Any torque transfer from
the rear axle to the front axle disturbs the ABS/brak-
ing system and causes potential instabilities on a
slippery surface. The BOC de-couples the rear driv-
eline as soon the rear wheels begin to spin faster
than the front wheels (front wheels locked) in order
to provide increased braking stability. Furthermore
the BOC also reduces the likelihood of throttle off
over-steer during cornering. In a throttle off maneu-
ver, the BOC once again de-couples the rear driveline
forcing all the engine brake torque to the front
wheels. This eliminates the chance of lateral slip on
the rear axle and increases it on the front. The vehi-
cle will therefore tend to understeer, a situation
which is considered easier to manage in most circum-
stances. During this maneuver, and during the ABS
braking event, the BOC does not transmit torque
Tool 6958
Tool 8493
Tool 8802
3 - 34 REAR DRIVELINE MODULERS
REAR DRIVELINE MODULE (Continued)
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through to the rear wheels. The rear driveline mod-
ule, with the BOC, will perform the same as a front
wheel drive vehicle during these events. The gear
ratio offset between the front and rear differentials
force the BOC into the overrunning mode most of thetime. This allows BOC to significantly reduce the
rolling resistance of the vehicle, which improves fuel
consumption, allows the downsizing of the driveline
components, and prevents the PTU and propshaft
joints from overheating.
Fig. 28 Bi-directional Overrunning Clutch and Viscous Coupler
1 - POWERFLOW - BOC OVERUNNING 6 - VISCOUS COUPLER
2 - POWERFLOW - BOC LOCKED 7 - BOC ROLLER CAGE
3 - BOC GROUND TAB 8 - BOC INPUT SHAFT
4 - FRICTION BRAKE SHOES 9 - INPUT FLANGE
5 - BOC ROLLERS
RSREAR DRIVELINE MODULE3-35
BI-DIRECTIONAL OVERRUNNING CLUTCH (Continued)
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