
Jeep Cherokee
Service Manual
Differential and driveline » Tube, 181, and 186 FBI axle » Removal and installation
181 FBI pinion shaft seal
REMOVAL
- Raise and support the vehicle.
- Remove wheel and tire assemblies.
- Remove brake rotors and calipers. Refer to
Group 5, Brakes, for proper procedures.
- Mark the propeller shaft and pinion yoke for
installation reference.
- Remove the propeller shaft from the yoke.
- Rotate the pinion gear three or four times.
- Measure the amount of torque necessary to
rotate the pinion gear with a (in. lbs.) dial-type
torque wrench. Record the torque reading for installation
reference.
- Using Holder 6958 to hold the pinion yoke,
remove the pinion nut and washer.
- Use Remover C-452 and Wrench C-3281 to
remove the pinion yoke (Fig. 6).
- Use a suitable pry tool or a slide hammer
mounted screw to remove the pinion shaft seal.
INSTALLATION
- Apply a light coating of gear lubricant on the
lip of pinion seal. Install seal with Installer C-3972-A
and Handle C-4171 (Fig. 7).
- Install yoke on the pinion gear with Installer
W-162-D, Cup 8109, and Holder 6958 (Fig. 8).

Fig. 6 Pinion Yoke Removal
1 - SPECIAL TOOL C-3281
2 - YOKE
3 - SPECIAL TOOL C-452
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Fig. 7 Pinion Seal Installation
1 - SPECIAL TOOL C-4171
2 - SPECIAL TOOL C-3972-A
CAUTION: Do not exceed the minimum tightening
torque when installing the pinion yoke retaining nut
at this point. Damage to the pinion bearings may
result.
- Install the pinion washer and a new nut on the
pinion gear. Tighten the nut only enough to
remove the shaft end play.
- Tighten pinion nut to 217 N·m (160 ft. lbs.).
- Rotate the pinion shaft using a (in. lbs.) torque
wrench. Rotating torque should be equal to the reading
recorded during removal, plus an additional 0.56
N·m (5 in. lbs.) (Fig. 9).
- If the rotating torque is low, use Holder 6958 to
hold the pinion yoke, and tighten the pinion shaft
nut in 6.8 N·m (5 ft. lbs.) increments until proper
rotating torque is achieved.

Fig. 8 Pinion Yoke Installation
1 - PINION YOKE
2 - AXLE HOUSING

Fig. 9 Check Pinion Rotation Torque
1 - PINION YOKE
2 - INCH POUND TORQUE WRENCH
- Align the installation reference marks on the
propeller shaft and yoke, and install the propeller
shaft.
- Check and fill the gear lubricant. Refer to the
Lubricant Specifications for gear lubricant requirements.
- Install the brake rotors and calipers. Refer to
Group 5, Brakes, for proper procedures.
- Install wheel and tire assemblies.
- Lower the vehicle.
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181 FBI pinion shaft seal