Jeep Cherokee

 Service Manual

Differential and driveline » Tube, 181, and 186 FBI axle » Removal and installation
186 FBI pinion shaft seal

REMOVAL

1.  Raise and support the vehicle.
2.  Remove wheel and tire assemblies.
3.  Remove brake rotors and calipers. Refer to Group 5, Brakes, for proper procedures.
4.  Mark the propeller shaft and pinion yoke for installation reference.
5.  Remove the propeller shaft from the yoke.
6.  Rotate the pinion gear three or four times.
7.  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.
8.  Using Holder 6958 to hold the pinion yoke, remove the pinion nut and washer.
9.  Use Remover C-452 and Wrench C-3281 to remove the pinion yoke (Fig. 10).

Fig. 10 Pinion Yoke Removal

1 - SPECIAL TOOL C-3281
2 - YOKE
3 - SPECIAL TOOL C-452

10. Use a suitable pry tool or a slide hammer mounted screw to remove the pinion seal.

INSTALLATION

1.  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. 11).
2.  Install yoke on the pinion gear with Installer W-162-D, Cup 8109, and Holder 6958 (Fig. 12).

CAUTION: Do not exceed the minimum tightening torque when installing the pinion yoke retaining nut at this point. Damage to collapsible spacer or bearings may result.

Fig. 11 Pinion Seal Installation

1 - SPECIAL TOOL C-4171
2 - SPECIAL TOOL C-3972-A

Fig. 12 Pinion Yoke Installation

1 - PINION YOKE
2 - AXLE HOUSING

3. Install the pinion washer and a new nut on the pinion gear. Tighten the nut only enough to remove the shaft end play.
4.  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. 13).
5.  If the rotating torque is low, use Holder 6958 to hold the pinion yoke (Fig. 14), and tighten the pinion shaft nut in 6.8 N·m (5 ft. lbs.) increments until proper rotating torque is achieved. CAUTION: If the maximum tightening torque is reached prior to reaching the required rotating torque, the collapsible spacer may have been damaged. Replace the collapsible spacer.
6.  Align the installation reference marks on the propeller shaft and yoke and install the propeller shaft

Fig. 13 Check Pinion Rotation Torque

1 - PINION YOKEБЮ 2 - INCH POUND TORQUE WRENCH

Fig. 14 Tightening Pinion Shaft Nut-Typical

1 - PINION FLANGE
2 - FRONT AXLE
3 - TOOL 6958

7. Check and fill the gear lubricant. Refer to the Lubricant Specifications for gear lubricant requirements.
8.  Install the brake rotors and calipers. Refer to Group 5, Brakes, for proper procedures.
9.  Install wheel and tire assemblies.
10.  Lower the vehicle.

Drive axle assembly

Tube axle assembly

Axle shaft-cardan U-joint

181 FBI pinion shaft seal

186 FBI pinion shaft seal

Collapsible spacer

Hub bearing and axle shaft

Steering knuckle and ball studs

Differential

Differential side bearings

Axle shaft oil seal

181 FBI pinion

186 FBI pinion

Ring gear