Thrust Bearing Preload

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

Select a suitable adjusting washer No. 1 so that dimension (H) will be zero in a visual check. Position the washer (20 x 31 x 4) and lock washer (20 x 31 x 2.3) and attach the lock nut (20 x 11).

Fig 1: Checking Thrust Bearing Preload
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Install the lock nut with ST1, ST2 and ST3.
NOTE:
- Use new lock nuts and lock washers.
- Install the lock washer in the correct direction.
Tightening torque:

126 N.m (12.8 kgf-m, 92.9 ft-lb)

ST1 18680AA020 HOLDER

ST2 18667AA020 HOLDER

ST3 18662AA010 SOCKET (27)

Fig 2: Installing Lock Nut With ST1, ST2 And ST3
Courtesy of SUBARU OF AMERICA, INC.
After removing the ST2 used in step 2, measure the starting torque using torque driver.
Starting torque:

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

ST1 18680AA020 HOLDER

ST3 18662AA010 SOCKET (27)

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

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

Fig 4: Identifying Adjusting Washer No. 1

Courtesy of SUBARU OF AMERICA, INC.

Adjusting washer No. 1
Part No.	Thickness mm (in)
803025071	2.925 (0.1152)
803025072	2.950 (0.1161)
803025073	2.975 (0.1171)
803025074	3.000 (0.1181)
803025075	3.025 (0.1191)
803025076	3.050 (0.1201)
803025077	3.075 (0.1211)

If the specified starting torque cannot be obtained by the selection of adjusting washer No. 1, select adjusting washer No. 2 from the list below. Repeat steps 1 through 4 to adjust starting torque.

Fig 5: Identifying Adjusting Washer No. 2

Courtesy of SUBARU OF AMERICA, INC.

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

Adjusting washer No. 2
Part No.	Thickness mm (in)
803025070	2.850 (0.1122)
803025074	3.000 (0.1181)
803025078	3.150 (0.1240)

Recheck that the starting torque is within the specified range, and crimp the lock nut at two locations so that the dimension (B) becomes 20.1 mm (0.79 in) or less.
CAUTION: When crimping the lock nut, be careful not to crack it.

Fig 6: Identifying Crimp Lock Nut Dimension
Courtesy of SUBARU OF AMERICA, INC.