Toyota
Jeep Cherokee
 Service Manual
Differential and driveline » Tube, 181, and 186 FBI axle » Removal and installation
181 FBI pinion

The ring gear and pinion are serviced as a matched set. Do not replace the pinion without replacing the ring gear.

REMOVAL

(1) Remove differential assembly from axle housing.

(2) Mark pinion yoke and propeller shaft for installation alignment.

(3) Disconnect propeller shaft from pinion yoke.

Using suitable wire, tie propeller shaft to underbody.

Fig. 37 Axle Seal Installation
Fig. 37 Axle Seal Installation

1 - TURNBUCKLE 6797
2 - DISCS 8110

(4) Using Holder 6958 to hold yoke, remove the pinion nut and washer.

(5) Using Remover C-452 and Holder C-3281, remove the pinion yoke from pinion shaft (Fig. 38).

Fig. 38 Pinion Yoke Removal
Fig. 38 Pinion Yoke Removal

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

(6) Remove the pinion gear and preload shims from housing (Fig. 39). Catch the pinion with your hand to prevent it from falling and being damaged.

Fig. 39 Remove Pinion Gear
Fig. 39 Remove Pinion Gear

1 - RAWHIDE HAMMER

(7) Remove the front pinion bearing cup, bearing, oil slinger, if equipped, and pinion seal with Remover D-147 and Handle C-4171 (Fig. 40).

Fig. 40 Front Bearing Cup Removal
Fig. 40 Front Bearing Cup Removal

1 - REMOVER
2 - HANDLE

(8) Remove the rear pinion bearing cup and oil slinger from the axle housing (Fig. 41). Use Remover D-149 and Handle C-4171. Record the thickness of the oil slinger for future reference.

Fig. 41 Rear Bearing Cup Removal
Fig. 41 Rear Bearing Cup Removal

1 - DRIVER
2 - HANDLE

(9) Remove the rear pinion bearing from the pinion with Puller/Press C-293-PA and Adapters C-293-39 (Fig. 42).

Place 4 adapter blocks so they do not damage the bearing cage.

(10) Remove the pinion depth shim/oil baffle from the pinion shaft. Record the thickness of the depth shim/oil baffle.

INSTALLATION

NOTE: A pinion depth shim/oil baffle is placed between the rear pinion bearing cone and pinion gear. If the factory installed ring and pinion gears are reused, the pinion depth shim/oil baffle should not require replacement. Refer to Pinion Gear Depth to select the proper thickness shim before installing pinion gear.

(1) Install a new oil slinger of the same thickness as the original into the rear pinion bearing bore of the axle housing.

(2) Apply Mopart Door Ease, or equivalent, stick lubricant to outside surface of rear pinion bearing cup. Install the bearing cup with Installer D-146 and Handle C-4171 (Fig. 43). Verify cup is correctly seated.

Fig. 42 Rear Bearing Removal
Fig. 42 Rear Bearing Removal

1 - SPECIAL TOOL C-293-PA
2 - VISE
3 - ADAPTERS
4 - DRIVE PINION GEAR SHAFT

Fig. 43 Rear Pinion Bearing Cup Installation
Fig. 43 Rear Pinion Bearing Cup Installation

1 - INSTALLER
2 - HANDLE

(3) Apply Mopart Door Ease, or equivalent, stick lubricant to outside surface of front pinion bearing cup. Install the bearing cup with Installer D-144 and Handle C-4171 (Fig. 44).

Fig. 44 Pinion Outer Bearing Cup Installation
Fig. 44 Pinion Outer Bearing Cup Installation

1 - INSTALLER
2 - HANDLE

(4) Install front pinion bearing, and oil slinger, if equipped.

(5) 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. 45).

Fig. 45 Pinion Seal Installation
Fig. 45 Pinion Seal Installation

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

(6) Install the rear pinion bearing and pinion depth shim/oil baffle onto the pinion gear with Installer W-262 and a shop press (Fig. 46).

Fig. 46 Rear Pinion Bearing Installation
Fig. 46 Rear Pinion Bearing Installation

1 - PRESS
2 - INSTALLATION TOOL
3 - PINION DEPTH SHIM/OIL BAFFLE
4 - DRIVE PINION
5 - DRIVE PINION SHAFT REAR BEARING

(7) Install pinion bearing preload shims onto the pinion gear (Fig. 47).

(8) Install pinion gear in housing.

(9) Install yoke with Installer W-162-B, Cup 8109, and Holder 6958 (Fig. 48).

Fig. 47 Pinion Preload Shims-Typical
Fig. 47 Pinion Preload Shims-Typical

1 - PINION PRELOAD SHIMS
2 - FRONT BEARING CUP
3 - SLINGER
4 - PINION YOKE
5 - WASHER
6 - PINION NUT
7 - PINION OIL SEAL
8 - FRONT BEARING CONE

Fig. 48 Pinion Yoke Installation
Fig. 48 Pinion Yoke Installation

1 - PINION YOKE
2 - AXLE HOUSING

(10) Install the pinion washer and a new nut on the pinion gear. Tighten the nut to 217 N·m (160 ft.

lbs.).

CAUTION: Never loosen pinion gear nut to decrease pinion gear bearing rotating torque and never exceed specified preload rotating torque.

(11) Check bearing preload torque with an inch pound torque wrench (Fig. 49). The torque necessary to rotate the pinion gear should be:

  •  Original Bearings-1 to 2 N·m (10 to 20 in. lbs.).
  •  New Bearings-1.5 to 4 N·m (15 to 35 in. lbs.).

(12) If rotating torque is above the desired amount, remove the pinion yoke and increase the preload shim pack thickness. Increasing the shim pack thickness 0.025 mm (0.001 in.) will decrease the rotating torque approximately 0.9 N·m (8 in. lbs.).

(13) Tighten pinion shaft nut in 6.8 N·m (5 ft. lbs.) increments until the maximum tightening or desired rotating torque is reached. Maximum tightening torque is 271 N·m (200 ft.lbs.).

(14) If the maximum tightening torque is reached prior to achieving the desired rotating torque, remove the pinion yoke and decrease the thickness of the preload shim pack. Decreasing the shim pack thickness 0.025 mm (0.001 in.) will increase the rotating torque approximately 0.9 N·m (8 in. lbs.).

Fig. 49 Check Pinion Gear Rotating Torque
Fig. 49 Check Pinion Gear Rotating Torque

1 - in. lbs. TORQUE WRENCH
2 - PINION YOKE

(15) Install differential assembly.

    More about «Removal and installation»:

    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

    Jeep Cherokee Service Manual / Differential and driveline / Tube, 181, and 186 FBI axle / Removal and installation / 181 FBI pinion

    Jeep Cherokee Service Manual

    Categories


    © 2017-2024 Copyright www.jcherokee.com