• | J 8001 Dial Indicator Set |
• | J 25025 Guide Pins |
• | J 25588 Side Bearing Shim Installer |
Align the needle and the dial face of the J 8001-3 to ZERO.
Measure and record the backlash.
Specification
The difference between the backlash at all of the measuring points should not vary by more than 0.05 mm (0.002 in).
• | Burrs |
• | A distorted case flange |
• | Uneven bolting |
Specification
The backlash between the ring gear and the drive pinion should be between 0.08-0.25 mm (0.003-0.010 in) with a preferred backlash of 0.13-0.18 mm (0.005-0.007 in).
Important:
• Do not use the original cast iron production shims to adjust the backlash. Use service shims and spacers instead. • 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).
9.1. | Remove the bearing cap bolts and the bearing caps. |
Mark the bearing caps left or right.
9.2. | Remove the differential case assembly with the bearing cups and the shims. |
Mark the bearing cups and the shims left or right.
9.3. | Measure the thickness of left side shim pack. |
Measure the production shim or the shim and service spacer in 3 locations.
Measure each shim separately.
9.4. | Calculate the average of the 3 measurements for each shim. |
Add the average of each of the shim measurements together.
Record the measurement. This is the thickness for the left side shim pack.
9.5. | Assemble a new left side shim pack by decreasing the appropriate amount of thickness from the original left side shim pack. If the original shim is cast iron production shim, assemble the shim pack using a service spacer and service shims. For example, to increase the backlash by 0.05 mm (0.002 in), remove 0.10 mm (0.004 in) of thickness from the left side shim pack. |
9.6. | Measure the thickness of right side shim pack. |
Measure the shim or the shim and service spacer in 3 locations.
Measure each shim separately.
9.7. | Calculate the average of the 3 measurements for each shim. |
Add the average of each of the shim measurements together.
Record the measurement. This is the thickness for the right side shim pack.
9.8. | Assemble a new right side shim pack by increasing the appropriate amount of thickness to 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 shims. For example, to increase the backlash by 0.05 mm (0.002 in), add 0.10 mm (0.004 in) of thickness to the right side shim pack. |
10.1. | Remove the bearing cap bolts and the bearing caps. |
Mark the bearing caps left or right.
10.2. | Remove the differential case assembly with the bearing cups and the shims. |
Mark the bearing cups and the shims left or right.
10.3. | Measure the thickness of left side shim pack. |
Measure the production shim or the shim and service spacer in 3 locations.
Measure each shim separately.
10.4. | Calculate the average of the 3 measurements for each shim. |
Add the average of each of the shim measurements together.
Record the measurement. This is the thickness for the left side shim pack.
10.5. | Assemble a new left side shim pack by increasing the appropriate amount of thickness to the original left side shim pack. If the original shim is cast iron production shim, assemble the shim pack using a service spacer and service shims. For example, to increase the backlash by 0.05 mm (0.002 in), add 0.10 mm (0.004 in) of thickness to the left side shim pack. |
10.6. | Measure the thickness of right side shim pack. |
Measure the shim or the shim and service spacer in 3 locations.
Measure each shim separately.
10.7. | Calculate the average of the 3 measurements for each shim. |
Add the average of each of the shim measurements together.
Record the measurement. This is the thickness for the right side shim pack.
10.8. | Assemble a new right side shim pack by decreasing the appropriate amount of thickness to 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 shims. For example, to decrease the backlash by 0.05 mm (0.002 in), remove 0.10 mm (0.004 in) of thickness to the right side shim pack. |
The service shim or shims must be installed between the service spacer and the differential bearing cup.
The service shim or shims must be installed between the service spacer and the differential bearing cup.
Notice: Refer to Fastener Notice in the Preface section.
Tighten
Tighten the bolts to 75 N·m (55 lb ft).
• | J 8001 Dial Indicator Set |
• | J 24429 Side Bearing Backlash Spanner |
• | J 25025 Guide Pins |
Important:
• Ensure that the side bearing surfaces in the axle housing are clean and
free of burrs. If the original bearings are to be reused, the original bearing cups
must also be used. • The differential side bearings must be initially preloaded in order to
determine the backlash of the gear set. After the backlash is set, the final bearing
preload is set.
Specification
The rotating torque of the drive pinion and differential assembly should be
3.4-6.2 N·m (30-55 lb in) for new bearings
or 2.8-5.1 N·m ( 25-45 lb in) for used bearings.
Align the needle and the dial face of the J 8001-3 to ZERO.
Measure and record the backlash.
Specification
The difference between the backlash at all of the measuring points should not
vary by more than 0.05 mm (0.002 in).
• | Burrs |
• | A distorted case flange |
• | Uneven bolting |
Specification
The backlash between the ring gear and the drive pinion should be between 0.08-0.25 mm
(0.003-0.010 in) with a preferred backlash of 0.13-0.18 mm
(0.005-0.007 in).
Important: Increasing or decreasing the shim thickness by 0.05 mm (0.002 in) will change the backlash adjustment approximately 0.03 mm (0.001 in).
13.1. | Remove the differential bearing adjuster nut retainer bolt. |
13.2. | Remove the differential bearing adjuster nut retainer. |
13.3. | Loosen the bearing cap bolts. |
Do not remove the bearing cap bolts.
13.4. | Loosen the differential bearing adjuster nut using the J 24429 . |
13.5. | Remove the differential side bearing shim. |
13.6. | Measure the thickness of the shim. |
Measure the shim in 3 locations.
13.7. | Calculate the average of the 3 measurements. |
Record the measurement.
13.8. | If the backlash is too small, select a smaller shim than the one that was removed. For example, to increase the backlash by 0.05 mm (0.002 in), select a shim that is 0.10 mm (0.004 in) thinner than the shim that was removed. |
13.9. | If the backlash is too large, select a larger shim than the one that was removed. For example, to increase the backlash by 0.05 mm (0.002 in), select a shim that is 0.10 mm (0.004 in) thicker than the shim that was removed. |
13.10. | Install the shim. |
Tighten
• | For used bearings, tighten the differential bearing adjuster nut an additional 2 slots. |
• | For new bearings, tighten the differential bearing adjuster nut an additional 3 slots. |
Tighten
Tighten the bearing cap bolts to 85 N·m (63 lb ft).
Tighten
Tighten the differential bearing adjuster nut retainer nut bolt to 26 N·m
(19 lb ft).