Backlash Adjustment (195/218 mm Axle)
Backlash Adjustment (195/218 mm Axle)
Special Tools
* J 8001 - Dial Indicator Set
* J 25025 - Guide Pins
* J 25588 - Side Bearing Shim Installer
For equivalent regional tools, refer to Special Tools Tools and Equipment.
Note: The following adjustment procedure applies to both left and right differential side bearings.
1. Use the J 25025 - pins and the J 8001 - set to measure the axle backlash.
2. The difference between the backlash at all the measuring points should not vary by more than 0.005 (0.002 in).
3. If the difference between the backlash at all of the measuring points varies by more than 0.005 (0.002 in), inspect for the following conditions:
* Burrs
* A distorted case flange
* Uneven bolting
4. If the difference between all the measuring points is within specifications, the backlash at the minimum lash point should be 0.050-0.127 mm (0.002-0.005 in).
5. If the backlash is within specifications, proceed to step 15.
6. If the backlash is less then the specified value in step 5, proceed to step 14.
Note:
* Use production shims and spacers when necessary.
* Adjust the thickness of the shim pack on each side of the differential in equal amounts. This will maintain the correct axle side bearing preload.
* Moving 0.05 mm (0.002 in) of shim thickness from one side of the differential to the other will change the backlash adjustment approximately 0.03 mm (0.001 in)
* Mark the bearing caps left and right
7. Remove the bearing caps and the bolts.
Note: Mark the bearing cups and the shims top left or right.
8. Remove the differential case assembly with the bearing caps and the shims.
Note: Measure each shim separately.
9. Measure the thickness of the left and right the shim packs in 3 locations.
Note: The combined average shim measurement is the thickness for the shim pack.
10. Calculate the average of the 3 measurements for each shim.
11. Assemble a new left side shim pack by decreasing the appropriate amount of thickness from the original right side shim pack. If the original shim is cast iron production shim, assemble the shim pack using a service spacer and service shim. For example, to increase the backlash by 0.05 mm (0.002 in), remove 0.10 mm (0.004 in) of thickness to the left side shim pack.
Note: The service shim must be installed between the service spacer and the differential bearing cup.
12. Using the J 25588 - installer, install service shim if necessary.
Caution: Refer to Fastener Caution Fastener Caution.
13. Install the bearing caps and bolts and tighten the bolts to 63 Nm (46 lb ft).
14. Recheck the backlash and adjust, if necessary.
15. Once backlash is correct, perform a gear tooth contact pattern check in order to ensure proper alignment between the ring and pinion gears. Refer to Gear Tooth Contact Pattern Inspection Gear Tooth Contact Pattern Inspection.