Carrier Bearing Outer Race Replacement and Preload Adjustment
Replacement and Preload AdjustmentSpecial Tools Required
- Driver 07749-0010000
- Attachment, 52 x 55 mm 07746-0010400
- Attachment, 62 x 68 mm 07746-0010500
- Attachment, 72 x 75 mm 07746-0010600
If any of the items listed were replaced, the carrier bearing preload must be adjusted.
- Transmission housing
- Clutch housing
- Differential carrier
- Carrier bearing and outer race
1. Remove the oil seals from the transmission housing and clutch housing.
Thrust Shim Replacement Transmission Housing
2. Drive the bearing outer race (A) and thrust shim (B) out of the transmission housing (C). Do not reuse the thrust shim. If you replaced the carrier bearing on the transmission housing side of the carrier, discard the outer race.
3. If you replaced the carrier bearing on the clutch housing side of the carrier, remove and discard the bearing outer race, Heat up the clutch housing to about 212°F (100°C) with a heat gun (A), then remove the outer race (B) and the 75 mm shim (C). Do not treat the housing in excess of 212°F (100°C).
4. Select a new thrust shim that's the same size as the one you removed, and use the special tools to install it (A) and the bearing outer race (B) in the transmission housing. (Use a new race if you replaced the bearing.) There should be no space between the race, shim, and housing.
5. If you removed the bearing outer race from the clutch housing, use the special tools to install a new one (A) along with the 75 mm shim (B). There should be no space between the race, shim, and housing.
6. With the mainshaft and countershaft removed, install the differential assembly, bolt the transmission and clutch housing together, and torque the 10 mm bolts to 47 Nm (4.8 kgf-cm, 35 ft. lbs.) and the 8 mm bolts to 27 Nm (2.8 kgf-cm, 20 ft. lbs.).
7. Rotate the differential assembly in both directions to seat the tapered roller bearings.
8. At normal room temperature, measure the starting torque of the differential assembly by rotating it in both directions with the special tool and a torque wrench (A).
STANDARD: 1.4 - 2.5 Nm (14 - 26 kgf-cm, 12 - 23 inch lbs.)
9. If the carrier bearing preload is not within the standard, select a thrust shim that will provide the correct preload:
Compare the bearing preload you got on the first try with the specified preload of 1.4 - 2.5 Nm (14 - 26 kgf-cm, 12 - 23 inch lbs.). If the preload you measure was less than specified, subtract it from the specified preload. If the preload you measure was more than specified, subtract it from the specified preload.
NOTE: Each shim size up or down from standard makes about 0.3 - 0.4 Nm (3 - 4 kgf-cm, 2.6 - 3.5 inch lbs.) difference in preload.
In example (1), your preload was 1.9 Nm (20 kgf-cm, 18 inch lbs.) less than standard, so you need a thrust shim five sizes thicker than standard (try the 2.32 mm (0.0913 inch) thrust shim, and recheck).
In example (2), your preload was 0.8 Nm (8 kgf-cm, 7 inch lbs.) more than standard, so you need a thrust shim two sizes thinner (try the 2.11 mm (0.0831 inch) thrust shim, and recheck).
THRUST SHIM
10. Once the carrier bearing preload is correct, install new oil seals in the differential.
11. Reinstall the transmission.