Pinion Depth Adjustment
Pinion Depth Adjustment^ Tools Required
- JB001 Dial Indicator Set
- J21777-40 Rear Pilot Washer
- J21777-42 Front Pilot Washer
- J21777-43 Stud Assembly-Bolt
- J21777-45 Side Bearing Discs
- J23597-1 Pinion Setting Gauge Arbor
- J23597-11 Pinion Setting Gauge Plate
Use a pinion setting gauge in order to measure differential drive pinion gear depth. The gauge provides a zero pinion as a gauging reference.
1. Install the J21777-40, J21777-42, the J21777-43, and the J21777-45.
2. Install the J23597-11.
3. Install the J21777-42 into the rear axle housing.
Notice: Refer to Fastener Notice in Service Precautions.
4. Install the drive pinion gear setting gauge nut into the rear axle housing.
^ Tighten the differential drive pinion gear setting gauge nut to 2.3 Nm (20 inch lbs.).
5. Rotate the J23597-11 in order to seat the following components:
^ The differential drive pinion gear outer bearing (2)
^ The differential drive pinion gear inner bearing (1)
6. Mount the J8001 onto the J23597-1.
7. Preload the dial indicator against the plunger about 1.27 mm (0.050 inch).
8. Install the J21777-45 onto the J23597-11. Position this unit into the rear axle housing.
9. Install the following components:
^ The carrier bearing caps (3)
^ The bearing cap bolts/screws (2)
^ Tighten the differential carrier bearing cap bolt screws (2) to 75 Nm (55 ft. lbs.).
10. Use the following steps in order to measure the differential drive pinion gear depth:
10.1. Rotate the J23597-1 slowly back and forth until the J8001 reads the greatest deflection. The deflection is the point where the needle changes direction.
10.2. At the point of deflection, set the J8001 to zero.
10.3. Repeat the rocking action in order to verify the zero setting.
10.4. After obtaining the zero setting, rotate the J23597-1 until the plunger no longer touches the J23597-11. This action provides the gauge reference of a zero or nominal drive pinion gear.
10.5. Use the following information in order to select the correct shim:
^ Record the J8001 reading at the pointer position. The required drive pinion gear shim thickness is equal to the J8001 reading. For example, if the pointer moved counterclockwise 1.70 mm (0.067 inch) to a dial reading of 0.84 mm (0.033 inch), a shim thickness of 0.84 mm (0.033 inch) is required.
^ Drive pinion gear shims are available in 0.03 - 0.94 mm (0.001 - 0.037 inch). The thickness of each shim is etched on the flat surface of the shim.
11. Loosen the J21777-43.
12. Remove all of the tools from the rear axle housing.
13. Remove the inner (1) and the outer (2) drive pinion gear bearings from the rear axle housing.
14. Install the correct drive pinion gear shim on the drive pinion gear.
15. Use the following steps in order to set the proper drive pinion gear depth:
15.1. Use the set-up dimension determined by J8001 as a starting point.
15.2. Perform a ring gear tooth pattern test in order to fine tune the drive pinion gear depth. The test may indicate additional necessary drive pinion gear shim changes.
16. Install the following components:
^ The drive pinion gear inner bearing
^ The drive pinion gear outer bearing
17. Assemble the differential case.
18. Measure the total preload at the drive pinion gear nut bearings. The preload should measure within the following specifications:
^ With new inner and outer drive pinion gear bearings and a new drive pinion gear seal, the preload should measure 3.6 - 6.2 Nm (32 - 55 inch lbs.).
^ With used inner and outer drive pinion gear bearings and a new drive pinion gear seal, the preload should measure 1.8 - 3.1 Nm (16 - 28 inch lbs.) when rotating with a new drive pinion gear seal.