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

ST 18658AA020 WRENCH COMPL RETAINER
Remove the oil pump cover.
Remove the liquid gasket from the mating surface completely.
Install the oil pump cover to converter case, and secure them with tightening four bolts evenly.
NOTE: Use an old gasket or aluminum washer to prevent damaging the mating surface of the housing.

Tightening torque:

41 N.m (4.2 kgf-m, 30.2 ft-lb)
Rotate the drive pinion ten times or more using ST1 and ST2.
ST1 18667AA010 HOLDER

ST2 499787700 WRENCH

Fig 1: Rotating Drive Pinion Using Holder And Wrench
Courtesy of SUBARU OF AMERICA, INC.
Tighten the LH retainer by rotating the shaft until resistance is felt. Then loosen the retainer RH. Keep tightening the retainer LH, and loosening the retainer RH until the pinion shaft no longer be turned. This is the "zero" state.

Fig 2: Identifying Retainer
Courtesy of SUBARU OF AMERICA, INC.
After the "zero" state is established, loosen the retainer LH by 3 notches and secure it with the lock plate. Then 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 3: Identifying Lock Plate
Courtesy of SUBARU OF AMERICA, INC.

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Front Differential Assembly: Adjustment