Jeep Grand Cherokee WK. Manual — part 1390
5. Using Spring Compressor 8250 (2) and a suitable
shop press (1), compress the 4C piston return
spring and install the snap-ring.
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6. Assemble and install the 4C clutch pack (3, 4) into the retainer/bulkhead (13) with the steel separator plate
against the piston.
7. Install the 4C reaction plate (8) and snap-ring (7) into the retainer/bulkhead (13). The 4C reaction plate is non-
directional.
8. Measure the 4C clutch clearance. The correct clutch clearance is 0.77-1.39 mm (0.030-0.055 in.). The snap-ring
(7) is selectable. Install the chosen snap-ring and re-measure to verify the selection.
9. Install the 2C piston (2) into the retainer/bulkhead (13).
10. Position the 2C Belleville spring (5) onto the 2C piston (2).
11. Position the 2C Belleville spring snap-ring (6) onto the 2C Belleville spring (5).
4C Retainer/Bulkhead Components
1 - SEAL
8 - REACTION PLATE
2 - 2C PISTON
9 - SNAP-RING
3 - PLATE
10 - RETURN SPRING
4 - DISC
11 - SEAL
5 - 2C BELLEVILLE SPRING
12 - 4C PISTON
6 - SNAP-RING
13 - 4C RETAINER/BULKHEAD
7 - SNAP-RING (SELECT)
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12. Using Spring Compressor 8249 (2) and a suitable
shop press (1), compress the Belleville spring (5)
until the snap-ring (6) is engaged with the snap-
ring groove in the retainer/bulkhead.
SEAL-ADAPTER HOUSING
REMOVAL
1. Remove the transfer case from the transmission.
2. Using a screw mounted on a slide hammer, remove the adapter housing seal.
INSTALLATION
1. Clean the adapter seal bore in the adapter housing
of any residue or particles remaining from the orig-
inal seal.
2. Install new oil seal in the adapter housing using
Seal Installer C-3860-A (1) . A properly installed
seal is flush to the face of the seal bore.
3. Install the transfer case onto the transmission.
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MECHANISM-BRAKE TRANSMISSION SHIFT INTERLOCK
DESCRIPTION
The
Brake
Transmission
Shifter/Ignition
Interlock
(BTSI) is a cable operated system that prevents the
transmission gear shifter from being moved out of
PARK without the proper driver inputs. The system
also contains a solenoid that is integral to the shifter
assembly. The solenoid works in conjunction with the
park lock cable (5) to permit shifter movement out of
PARK when the brake is depressed.
OPERATION
The
Brake
Transmission
Shifter/Ignition
Interlock
(BTSI) is engaged whenever the ignition switch is in
the LOCK (1) position. An additional electrically acti-
vated feature will prevent shifting out of the PARK
position unless the brake pedal is depressed at least
one-half inch. A solenoid in the shifter assembly is de-
energized when the ignition is in the ON position and
the brake pedal is depressed. When the key is in the
ON position and the brake pedal is depressed, the
shifter is unlocked and will move into any position. The
interlock system also prevents the ignition switch from
being turned to the LOCK position, unless the shifter
is in the gated PARK position.
The following chart describes the normal operation of the Brake Transmission Shift Interlock (BTSI) system. If the
“expected response” differs from the vehicle’s response, then system repair and/or adjustment is necessary.
ACTION
EXPECTED RESPONSE
1. Turn key to the
9
ACC
9
position and depress brake
pedal.
1. Shifter CAN be shifted out of park.
2. Turn key to the
9
ON
9
position, with foot off of brake
pedal.
2. Shifter CANNOT be shifted out of park.
3. Turn key to the
9
ON
9
position and depress the brake
pedal.
3. Shifter CAN be shifted out of park.
4. Leave shifter in any gear, except
9
PARK
9
, and try to
return key to the
9
LOCK
9
position.
4. Key cannot be returned to the
9
LOCK
9
position.
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