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Home >> Subaru >> 2017 >> WRX Base >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 17 (Continuously Variable Transaxle (CVT) (Service Information)) >> Front Differential Assembly >> Adjustment

Front Differential Assembly: Adjustment

WARNING: This page is about a different variant/trim than selected.
  1. Using the ST, screw-in the retainer until resistance is felt.
    NOTE: RH side should be screwed-in more than LH side.

    ST 18658AA020 WRENCH COMPL RETAINER

    Fig 1: Removing Differential Side Retainers Using ST
    G06654708Courtesy of SUBARU OF AMERICA, INC.
  2. Remove the remaining liquid gasket from the mating surface completely.
  3. Using the ST, install the drive pinion assembly to converter case.

    ST 18270KA020 SOCKET (E20)

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

    Tightening torque: 

    43 N.m (4.4 kgf-m, 31.7 ft-lb) 

    Fig 2: Drive Pinion Retainer Different-Length Bolts
    G09482249Courtesy of SUBARU OF AMERICA, INC.
  4. Rotate the drive pinion shaft ten times or more using ST1 and ST2.

    ST1 18667AA010 HOLDER

    ST2 499787700 WRENCH

    Fig 3: Rotating Drive Pinion Using ST1 And ST2
    G06654696Courtesy of SUBARU OF AMERICA, INC.
  5. While rotating the pinion shaft, tighten the retainer LH and loosen the retainer RH until the shaft can't be turned anymore. The backlash is "zero" when the pinion shaft comes to the point where it doesn't rotate.
  6. After the "zero" state is established, loosen the retainer LH by 3 notches and secure it with the lock plate. Loosen the retainer RH and retighten until it stops. Rotate the drive pinion 2 or 3 times. Tighten the retainer RH further 1-3/4 notches. This sets the preload. Finally, secure the retainer with its lock plate.
    Fig 4: Lock Plate
    G11577974Courtesy of SUBARU OF AMERICA, INC.
    NOTE: Turning the retainer by every one tooth changes the backlash approx. 0.05 mm (0.0020 in).
    Fig 5: Retainer Turning Angle
    G11577975Courtesy of SUBARU OF AMERICA, INC.
  7. Insert the two SUBARU genuine axle shafts into differential case.

    Part No. 38415AA070 Axle shaft

  8. Wrap the drive shaft pinion shaft with cloth and pinch with vise pliers. Install the installation bolt into the bolt hole of secondary pulley and secure the bolt and vise pliers using a band or wire. Make sure the drive pinion shaft does not move.
    Fig 6: Securing Bolt And Vise Pliers Using Band Wire
    G06654738Courtesy of SUBARU OF AMERICA, INC.
  9. Check the backlash is within specification using ST1, ST2 and ST3.

    ST1 498255400 PLATE

    ST2 498247001 MAGNET BASE

    ST3 498247100 DIAL GAUGE

    Backlash: 

    0.13 - 0.18 mm (0.005 - 0.007 in) 

    Fig 7: Checking Backlash Of Front Differential Assembly
    G09482309Courtesy of SUBARU OF AMERICA, INC.
  10. Adjust the teeth contact of the front differential and drive shaft. <Ref. to ADJUSTMENT , Drive Pinion Shaft Assembly.>
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