Pinion Depth Adjustment
Pinion Depth Adjustment^ Tools Required
- J 8001 Dial Indicator Set
- J 21777-40 Rear Pilot Washer
- J 21777-42 Front Pilot Washer
- J 21777-43 Stud Assembly
- J 21777-45 Side Bearing Disc
- J 23597- 1 Arbor
- J 23597- 11 Gage Plate
Use a pinion setting gage in order to measure differential drive pinion gear depth. The gage provides a zero pinion as a gaging reference.
1. Install the J 21777-40, J 21777-42, 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 gage nut into the rear axle housing.
^ Tighten the differential drive pinion gear setting gage 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 321777-45 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 J 8001 reads the greatest deflection.
The deflection is the point where the needle changes direction.
10.2. At the point of deflection, set the J 8001 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 J 23597- 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 J 8001 reading at the pointer position.
The required drive pinion gear shim thickness is equal to the J 8001 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 J 21777-43.
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 J 8001 as a starting point.
15.2. Perform a ring gear tooth pattern test in order to determine if additional drive pinion gear shim changes are necessary.
16. Install the drive pinion gear inner and outer bearings.
17. Assemble the differential case.
18. With a new drive pinion gear seal installed, measure the total bearing preload of the assembly at the drive pinion gear nut:
Specification
^ Rotating torque 3.6 - 6.2 Nm (32 - 55 inch lbs.) with new inner and outer drive pinion gear bearings.
^ Rotating torque 1.8 - 3.1 Nm (16 - 28 inch lbs.) with used inner and outer drive pinion gear bearings.