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Front Differential Assembly: Adjustment

  1. Using the ST, screw-in the retainer until light contact is felt.
    NOTE: Screw-in the RH side slightly deeper than the LH side.

    ST 18630AA010 WRENCH ASSY

    Fig 1: Identifying Wrench Assy ST 18630AA010
    G03831834Courtesy of SUBARU OF AMERICA, INC.
  2. Remove the oil pump cover.
  3. Remove the liquid gasket from the mating surface completely.
  4. Install the oil pump cover to converter case, and secure them with tightening four bolts evenly.
    NOTE: Use an old gasket or aluminum washer so as not to damage the mating surface of housing.

    Tightening torque: 

    41 N.m (4.2 kgf-m, 30.4 ft-lb) 

  5. Rotate the drive pinion ten times or more using ST1 and ST2.

    ST1 18667AA010 HOLDER

    ST2 499787700 WRENCH

    Fig 2: Rotating Drive Pinion Using Holder ST1 18667AA010 And Wrench ST2 499787700
    G03831835Courtesy of SUBARU OF AMERICA, INC.
  6. Tighten the retainer LH until contact is felt while rotating the shaft. Then loosen the retainer RH. Keep tightening the retainer LH, and loosening the retainer RH until the pinion shaft cannot be turned. This is the "zero" state.
    Fig 3: Tightening Retainer
    G03831836Courtesy of SUBARU OF AMERICA, INC.
  7. After the "zero" state is established, back off the retainer LH 3 notches and secure it with the lock plate. Then back off the retainer RH and retighten until it stops. Rotate the drive pinion few times. Tighten the retainer RH 1-3/4 notches further. This sets the preload. Finally, secure the retainer with its lock plate.
    Fig 4: Installing Lock Plate
    G03831837Courtesy of SUBARU OF AMERICA, INC.
    NOTE: Turning the retainer by one tooth changes the backlash about 0.05 mm (0.0020 in).
    Fig 5: Identifying Retainer Backlash
    G03831838Courtesy of SUBARU OF AMERICA, INC.
  8. Turn the drive pinion several times with ST1 and check to see if the backlash is within the specified value with ST2, ST3, ST4 and ST5.

    ST1 499787700 WRENCH

    ST2 498247001 MAGNET BASE

    ST3 498247100 DIAL GAUGE

    ST4 499787500 ADAPTER

    ST5 498255400 PLATE

    Backlash: 

    0.13-0.18 mm (0.0051-0.0071 in) 

  9. Adjust the tooth contact between front differential and drive shaft. < Ref. to , ADJUSTMENT , Drive Pinion Shaft Assembly. >
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