Thrust Bearing Preload

WARNING: This page is about a different variant/trim than selected.

Select the adjusting washer No. 1 so that dimension (H) is zero through visual check. Position the washer (18.3 x 30 x 4) and lock washer (18 x 30 x 2) and install the lock nut (18 x 13.5).

Fig 1: Identifying Dimension (H)
Courtesy of SUBARU OF AMERICA, INC.
Using the ST1, ST2 and ST3, tighten the new lock nut to specified torque.
ST1 899884100 HOLDER

ST2 498427100 STOPPER

ST3 899988608 SOCKET WRENCH (27)

Tightening torque:

120 N.m (12.2 kgf-m, 88.5 ft-lb)

Fig 2: Tightening Lock Nut Using Holder ST1 899884100 And Socket Wrench ST3 899988608
Courtesy of SUBARU OF AMERICA, INC.
After removing the ST2, measure the starting torque using torque driver.
ST1 899884100 HOLDER

ST3 899988608 SOCKET WRENCH (27)

Starting torque:

0.3 - 0.8 N.m (0.03 - 0.08 kgf-m, 0.2 - 0.6 ft-lb)

Fig 3: Measuring Starting Torque Using Torque Driver
Courtesy of SUBARU OF AMERICA, INC.

If the starting torque is not within specified limit, select a new adjusting washer No. 1 and recheck starting torque.

Fig 4: Identifying Adjusting Washers

Courtesy of SUBARU OF AMERICA, INC.

ADJUSTING WASHER THICKNESS SPECIFICATIONS

Adjusting washer No. 1
Part No.	Thickness mm (in)
803025051	3.925(0.1545)
803025052	3.950(0.1555)
803025053	3.975(0.1565)
803025054	4.000(0.1575)
803025055	4.025(0.1585)
803025056	4.050(0.1594)
803025057	4.075(0.1604)

If the specified starting torque range cannot be obtained when a No. 1 adjusting washer is used, then select a suitable No. 2 adjusting washer from those listed in the following table. Repeat steps 1) through 4) to adjust starting torque.

Fig 5: Identifying Adjusting Washers

Courtesy of SUBARU OF AMERICA, INC.

DIMENSION SPECIFICATION

Starting torque	Dimension H	Washer No. 2
Low	Small	Select thicker one.
High	Large	Select thinner one.

ADJUSTING WASHER THICKNESS SPECIFICATIONS

Adjusting washer No. 2
Part No.	Thickness mm (in)
803025059	3.850 (0.1516)
803025054	4.000 (0.1575)
803025058	4.150 (0.1634)

Recheck that the starting torque is within specified range, then clinch the lock nut at four positions.