When reassembling the side bearing without replacing, be sure to install a shim having same thickness as that before disassembly. The following instructions apply when the bearing is replaced.

1. Place an approximately 2.5 kg (5.5 lb) weight on the side bearing, and measure bearing thickness

Standard side bearing width: 17.5 mm (0.689 in)

Note: With the weight placed on the side bearing, turn the bearing two to three turns, and measure thickness.

ST3250S000
Fig. PD-25 Measuring for bearing

[Calculate E and F

   E = Left  Measured Thickness - 17.5 mm
   F = Right Measured Thickness - 17.5 mm

   Example: 17.52 mm - 17.5 mm =  0.02 mm
            17.49 mm - 17.5 mm = -0.01 mm]

2. Side bearing adjusting shim thickness calculating formula

  Left side (drive gear side)
    T1=(A-C+D-H')× 0.01 +0.2 + E (mm)
  Right side (pinion mate side)
    T2=(B-D+H)×0.01+0.2+F (mm)

Figures for A, B, C, D and H' are dimensional
variations in a unit of 1/100 mm against each
standard measurement.
   Where 
   A = The figure marked on the left side bearing housing
       of gear carrier.
   B = The figure marked on the right side bearing housing
       of gear carrier.
   C&D = The figure marked on the differential case.
   E&F = These are differences in width of left or right
         side bearing against the standard width 17.5 mm 
         (0.6890 in). Figure is given in a unit of 1/100 mm.

  Fig. PD-26 Thickness of shim on left side
     Thickness of shim on right side

  H' = The figure marked on the ring gear.

Example of calculation

  A=1 B= 2 C=-2 D=3
  E=+0.02 mm F=-0.01 mm H'=+1

Left side

  T1=(1-2+3-1)×0.01+0.2+0.02= 0.23 mm

Right side

  T2=(2-3+1)×0.01+0.2-0.01=0.19 mm

Apply a 0.23 mm shim and 0.19 mm shim respectively to the left and right, and fit the side bearing using Differential Side Bearing Drift ST33220000.

  Side bearing adjusting shims
  Thickness mm (in)
  0.05 (0.0020)
  0.07 (0.0028)
  0.10 (0.0039)
  0.20 (0.0079)
  0.50 (0.0197)

3. Install the differential case assembly, together with the side bearing outer race, on the final drive housing.

Note: Be careful not to confuse the right and left sides of the side bearing housing.

4. Install the bearing cap, and tighten the installation bolt to the rated tightening torque.

  Bearing cap tightening torque:
  5 to 6 kg-m (36.2 to 43.4 ft-lb)

Note: Be sure to align match mark put before disassembly correctly.

5. Measure "L" dimension (between left and right bearing cap edges) by a micrometer.

  "L" dimension: 153.40 to 153.55 mm (6.0394 to 6.0453 in)

6. Upon completion of reassembly, measure drive pinion/ring gear backlash. When backlash is less than the rated value, move the side bearing adjusting shim from the left side (ring gear side) to the right side. When backlash is more than the rated value, move the side bearing from the right to left contrarily.

  Backlash: 0.10 to 0.15 mm (0.0039 to 0.0059 in)

  Fig. PD-28 Measuring backlash

7. Existence of foreign matter between the drive gear and differential case is considered when backlash fluctuates considerably. Measure drive gear back deflection.

8. Check the run-out of ring gear side is within 0.05 mm (0.0020 in) total indicator reading.

  Fig. PD-29 Measuring run-out of ring gear

9. When run-out of ring gear is normal and fluctuation of backlash is considerable, replace the gear set. Before replacing the gear set, be sure to measure companion flange deflection. Fluctuation of backlash may be considerable due to deflection of pinion bearing.

  Limit of deflection:
  A portion:
    Less than 0.05 mm (0.0020 in)
  B portion:
    Less than 0.05 mm (0.0020 in)

  Fig. PD-30 Measuring place

10. At the same time, check bearing preload. Bearing preload should read 8 to 15 kg-cm (6.95 to 13.03 in-lb) of rotating torque [2.3 to 4.3 kg (5.1 to 9.5 lb) at companion flange bolt hole].

If preload does not accord with this specification, adjust it with side bearing shims.

11. Check and adjust the tooth contact pattern of ring gear and drive pinion.

  (1) Thoroughly clean ring and drive pinion gear teeth.
  (2) Paint ring gear teeth lightly and evenly with a
       mixture of powdered red lead and oil of a suitable
       consistency to produce a contact pattern.
  (3) Rotate pinion through several revolutions in the
      forward and reverse direction until a definite contact
      pattern is developed on ring gear.
  (4) When contact pattern is incorrect, readjust thickness
      of adjust shim.

Be sure to wipe out red lead completely upon completion of adjustment.

(5) Incorrect contact pattern of teeth can be adjusted in the following manner.

   a. Heel contact
      To correct, increase thickness of drive pinion adjusting 
      washer in order to bring drive pinion close to ring gear.

   Fig. PD-3 Heel contact

   b. Toe contact
      To correct, reduce thickness of drive pinion adjusting
      washer in order to make drive pinion go away from ring
      gear.

      Fig. PD-32 Toe contact

   c. Flank contact
      Adjust in manner similar to b.

      Fig. PD-33 Flank contact

   d. Face contact
      Adjust in manner similar to a.

      Fig. PD-34 Face contact

   e. Correct tooth contact

   Fig. PD-35 Correct contact

Note: Change in thickness of adjusting washer is accompanied by change in backlash. Check it when installing gear.

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