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Drive Pinion Shaft Assembly: Adjustment

WARNING: This page is about a different car, the 2020 Subaru Impreza. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove the liquid gasket from the mating surface completely.
  2. Using the ST, install the drive pinion retainer to converter case.

    Preparation tool: 

    ST: SOCKET (E20) (18270KA020)

    NOTE: Do not confuse the three different-length bolts when installing.

    Tightening torque: 

    43 N.m (4.4 kgf-m, 31.7 ft-lb)

    G10218887Courtesy of SUBARU OF AMERICA, INC.
  3. Rotate the drive pinion several times using ST1 and ST2.

    Preparation tool: 

    ST1: HOLDER (498937110)

    ST2: WRENCH (499787700)

    G08318121Courtesy of SUBARU OF AMERICA, INC.
  4. Adjust the drive pinion and hypoid driven gear backlash. Refer to CONTINUOUSLY VARIABLE TRANSMISSION (TR580 IMPREZA)>FRONT DIFFERENTIAL ASSEMBLY>ADJUSTMENT .
  5. Using the ST, remove the drive pinion retainer from converter case.

    Preparation tool: 

    ST: SOCKET (E20) (18270KA020)

  6. Apply lead-free red dye evenly on the both sides of three to four teeth of the hypoid driven gear. Then install the drive pinion retainer and rotate the drive pinion in both directions several times. Remove the drive pinion retainer and check the tooth contact pattern.

    If the teeth contact is inappropriate, adjust the backlash or thickness of the shim. Refer to CONTINUOUSLY VARIABLE TRANSMISSION (TR580 IMPREZA)>FRONT DIFFERENTIAL ASSEMBLY>ADJUSTMENT .

    NOTE: After correction, wipe off the lead-free red dye.
    Drive pinion shim
    Part No. Thickness mm (in)
    31451AA320 0.150 (0.0059)
    31451AA330 0.175 (0.0069)
    31451AA340 0.200 (0.0079)
    31451AA350 0.225 (0.0089)
    31451AA360 0.250 (0.0098)
    31451AA370 0.275 (0.0108)
    • Correct tooth contact

      Check item: Tooth contact surface is slightly shifted toward the toe side under a no-load condition. (When driving, it moves towards the heel side.) 

      G13603878Courtesy of SUBARU OF AMERICA, INC.
    • Face contact

      Check item: Backlash is too large  .

      Contact pattern

      G10317716Courtesy of SUBARU OF AMERICA, INC.

      Corrective action: Increase thickness of drive pinion shim according to the procedures for moving the drive pinion close to hypoid driven gear.

      G10317717Courtesy of SUBARU OF AMERICA, INC.
    • Flank contact

      Check item: Backlash is too small  .

      Contact pattern

      G10317718Courtesy of SUBARU OF AMERICA, INC.

      Corrective action: Reduce the thickness of the drive pinion shim according to the procedures for moving the drive pinion away from the hypoid driven gear.

      G10317719Courtesy of SUBARU OF AMERICA, INC.
    • Toe contact (inside contact)

      Check item: Teeth contact area is too small  .

      Contact pattern

      G10317720Courtesy of SUBARU OF AMERICA, INC.

      Corrective action: Reduce the thickness of the drive pinion shim according to the procedures for moving the drive pinion away from the hypoid driven gear side.

      G10317719Courtesy of SUBARU OF AMERICA, INC.
    • Heel contact (outside end contact)

      Check item: Teeth contact area is too small  .

      Contact pattern

      G10317722Courtesy of SUBARU OF AMERICA, INC.

      Corrective action: Increase the thickness of the drive pinion shim according to the procedures for moving the drive pinion closer to the hypoid driven gear.

      G10317717Courtesy of SUBARU OF AMERICA, INC.
  7. Using the ST, loosen the differential side retainer until the mounting groove of the O-ring appears, and then install the O-ring.
    NOTE:
    • When loosening the differential side retainer, record the number of the turns made.
    • Perform this for both left and right differential side retainers.
    • Use new O-rings.
    • Apply the differential gear oil to O-ring.

    Preparation tool: 

    ST: WRENCH COMPL RETAINER (18658AA021)

  8. Using the ST, tighten the retainer to the position before it is loosened.

    Preparation tool: 

    ST: WRENCH COMPL RETAINER (18658AA021)

  9. Replace the differential side retainer oil seal with a new part. Refer to CONTINUOUSLY VARIABLE TRANSMISSION (TR580 IMPREZA)>DIFFERENTIAL SIDE RETAINER OIL SEAL .
  10. Install the lock plate.

    Tightening torque: 

    25 N.m (2.5 kgf-m, 18.4 ft-lb)

    G13603887Courtesy of SUBARU OF AMERICA, INC.
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