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Drive Pinion Shaft: Assembly

  1. Measure dimension "A" of the drive pinion shaft.
    1. ST 398643600 GAUGE
    Fig 1: Measuring Dimension "A" Of Drive Pinion Shaft
    G02875994Courtesy of SUBARU OF AMERICA, INC.
  2. Using a press, force-fit a new roller bearing in position.
    NOTE: If too much pressure is applied, the roller bearing will not turn easily.
    Fig 2: Force-Fitting New Roller Bearing In Position
    G02875995Courtesy of SUBARU OF AMERICA, INC.
  3. After fitting a new O-ring to the shaft, attach the drive pinion collar to the shaft.
  4. Install the lock washer to drive pinion shaft in proper direction.
  5. Tighten a new lock nut with ST1, ST2 and ST3.

    Calculate lock washer and lock nut specifications using the following formula.

    1. T2 = L2/(L1 + L2) x T1
    2. T1:  116 N.m (11.8 kgf-m, 85.3 ft-lb)
    3. [Required torque setting]
    4. T2:  Tightening torque
    5. L1:  ST2 length 0.072 m (2.83 in)
    6. L2:  Torque wrench length

    Example: 

    TORQUE WRENCH SPECIFICATION

    Torque wrench length m (in) Tightening torque N.m (kgf-m, ft-lb)
    0.4 (15.75) 98 (10.0, 72)
    0.45 (17.72) 100 (10.2, 73.8)
    0.5 (19.69) 101 (10.3, 74.5)
    0.55 (21.65) 102 (10.4, 75)
    1. ST1 498937110 HOLDER
    2. ST2 499787700 WRENCH
    3. ST3 499787500 ADAPTER
    NOTE: Install ST2 to torque wrench as straight as possible.
    Fig 3: Tightening Lock Nut With ST
    G02875996Courtesy of SUBARU OF AMERICA, INC.
  6. Measure the starting torque of the bearing. Make sure the starting torque is within the specified range. If out of the allowable range, replace the roller bearing.
    1. Starting torque:  7.6-38.1 N (0.776-3.88 kgf, 1.7 - 8.6 lb)
    Fig 4: Measuring Starting Torque Of Bearing
    G02875997Courtesy of SUBARU OF AMERICA, INC.
  7. Stake the lock nut securely at two places.
  8. Measure dimension "B" of the drive pinion shaft.
    1. ST 398643600 GAUGE
    Fig 5: Measuring Dimension "B" Of Drive Pinion Shaft
    G02875998Courtesy of SUBARU OF AMERICA, INC.
  9. The thickness "t" (mm) of the drive pinion shim.
    1. t = 6.5+/-0.0625 - (B - A) 
  10. Select three or less shims from following table.
AVAILABLE DRIVE PINION SHIMS

Part No. Thickness mm (in)
31451AA050 0.150(0.0059)
31451AA060 0.175(0.0069)
31451AA070 0.200 (0.0079)
31451AA080 0.225 (0.0089)
31451AA090 0.250 (0.0098)
31451AA100 0.275(0.0108)
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