Jeep Wrangler TJ. Manual — part 286
(5) The generator shaft uses conventional right-
hand threads to attach decoupler. To break decoupler
loose from generator threads, rotate end of tool clock-
wise (Fig. 13) or, (Fig. 14).
(6) After breaking loose with tool, unthread decou-
pler by hand from generator.
Fig. 9 GENERATOR DECOUPLER PULLEY (LITENS)
1 - DECOUPLER (LITENS)
2 - HEX OPENING
Fig. 10 #8823 TOOL AND INA DECOUPLER
1 - INA DECOUPLER
2 - TOOL #8823 (VM.1048)
Fig. 11 END OF GENERATOR SHAFT (HEX)
1 - GENERATOR SHAFT
2 - HEX
Fig. 12 END OF GENERATOR SHAFT (SPLINED)
1 - GENERATOR SHAFT
2 - SPLINES
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CHARGING
8F - 27
GENERATOR DECOUPLER PULLEY (Continued)
Litens Decoupler
(1) Disconnect negative battery cable.
(2) Remove generator and accessory drive belt.
Refer to Generator Removal.
(3) Position Special Tool #8433 (Fig. 15) into
decoupler. Align to hex end of generator shaft.
(4) The generator shaft uses conventional right-
hand threads to attach decoupler. To break decoupler
loose from generator threads, rotate end of tool clock-
wise (Fig. 16).
(5) After breaking loose with tool, unthread decou-
pler by hand from generator.
Fig. 13 DECOUPLER REMOVAL (INA-HEX)
1 - DEEP 10 MM SOCKET
2 - TOOL #8823 (VM.1048)
Fig. 14 DECOUPLER REMOVAL (INA-SPLINED)
1 - DRIVER
2 - TOOL #8823 (VM.1048)
3 - 17 MM WRENCH
Fig. 15 # 8433 TOOL AND LITENS DECOUPLER
Fig. 16 DECOUPLER REMOVAL (LITENS)
8F - 28
CHARGING
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GENERATOR DECOUPLER PULLEY (Continued)
INSTALLATION
INA Decoupler
(1) Thread decoupler pulley onto generator shaft
by hand (right-hand threads).
(2) Position Special Tool #8823 (VM.1048) into
decoupler (Fig. 10).
(3) Determine if end of generator shaft is hex
shaped (Fig. 11) or is splined (Fig. 12). If hex is used,
insert a 10MM deep socket into tool #8823 (VM.1048)
(Fig. 17). If splined, insert a 5/16” 6-point hex driver,
or a 10MM 12-point triple square driver into tool
#8823 (VM.1048) (Fig. 18).
(4) Do not use an adjustable, ratcheting “click
type”
torque
wrench.
Most
“click
type”
wrenches will only allow torque to be applied
in a clockwise rotation. Use a dial-type or
beam-type wrench. Tighten in counter-clockwise
rotation (Fig. 17) or, (Fig. 18). Refer to torque speci-
fications.
(5) Install accessory drive belt, and generator.
Refer to Generator Installation.
(6) Connect negative battery cable.
Litens Decoupler
(1) Thread decoupler pulley onto generator shaft
by hand (right-hand threads).
(2) Position Special Tool 8433 (Fig. 15) into decou-
pler. Align tool to hex end of generator shaft.
(3) Do not use an adjustable, ratcheting “click
type”
torque
wrench.
Most
“click
type”
wrenches will only allow torque to be applied
in a clockwise rotation. Use a dial-type or
beam-type wrench. Tighten in counter-clockwise
rotation (Fig. 19). Refer to torque specifications.
(4) Install accessory drive belt, and generator.
Refer to Generator Installation.
(5) Connect negative battery cable.
Fig. 17 DECOUPLER INSTALLATION (INA-HEX)
1 - 10MM DEEP SOCKET
2 - TOOL # 8823 (VM.1048)
Fig. 18 DECOUPLER INSTALLATION (INA SPLINED)
1 - DRIVER
2 - TOOL # 8823 (VM.1048)
Fig. 19 DECOUPLER INSTALLATION (Litens)
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CHARGING
8F - 29
GENERATOR DECOUPLER PULLEY (Continued)
VOLTAGE REGULATOR
DESCRIPTION
The Electronic Voltage Regulator (EVR) is not a
separate component. It is actually a voltage regulat-
ing circuit located within the Powertrain Control
Module (PCM). The EVR is not serviced separately. If
replacement is necessary, the PCM must be replaced.
OPERATION
The amount of DC current produced by the gener-
ator is controlled by EVR circuitry contained within
the PCM. This circuitry is connected in series with
the generators second rotor field terminal and its
ground.
Voltage is regulated by cycling the ground path to
control the strength of the rotor magnetic field. The
EVR circuitry monitors system line voltage (B+) and
battery temperature (refer to Battery Temperature
Sensor for more information). It then determines a
target charging voltage. If sensed battery voltage is
0.5 volts or lower than the target voltage, the PCM
grounds the field winding until sensed battery volt-
age is 0.5 volts above target voltage. A circuit in the
PCM cycles the ground side of the generator field up
to 100 times per second (100Hz), but has the capabil-
ity to ground the field control wire 100% of the time
(full field) to achieve the target voltage. If the charg-
ing rate cannot be monitored (limp-in), a duty cycle
of 25% is used by the PCM in order to have some
generator output. Also refer to Charging System
Operation for additional information.
8F - 30
CHARGING
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