Front Hub Unit Bearing: Installation

Install the front axle housing (a) and front hub unit bearing (c) to the disc brake cover (b) as shown in the figure, and tighten the bolt.

Fig 1: Identifying Front Axle Housing, Front Hub Unit Bearing And Disc Brake Cover
Courtesy of SUBARU OF AMERICA, INC.

Tightening torque:

65 N.m (6.63 kgf-m, 47.9 ft-lb)
Install the front drive shaft. Refer to INSTALLATION .
Tighten the axle nut temporarily.
Install the disc rotor to hub unit bearing.
Install the disc brake caliper to the front axle housing.
Tightening torque:

120 N.m (12.24 kgf-m, 88.5 ft-lb)
Install the front ABS wheel speed sensor.
Tightening torque:

7.5 N.m (0.76 kgf-m, 5.5 ft-lb)
While pressing the brake pedal, tighten the new axle nuts to the specified torque.
CAUTION: Do not load the front axle before tightening the axle nut. Doing so may damage the hub bearing.

Tightening torque:

220 N.m (22.43 kgf-m, 162.3 ft-lb)
Inspect the lean of axis direction using a dial gauge. Replace the bearing if the load range exceeds the limitation.

Fig 2: Inspecting Lean Of Axis Direction Using Dial Gauge
Courtesy of SUBARU OF AMERICA, INC.

Service limit:

Maximum: 0.05 mm (0.0020 in)
After tightening the axle nut, lock it securely.

Fig 3: Locking Axle Nut
Courtesy of SUBARU OF AMERICA, INC.
Install the wheel.
Tightening torque:

120 N.m (12.24 kgf-m, 88.5 ft-lb)
Moving the front tire up and down by hand, check there is no play in bearing, and check the wheel rotates smoothly.
CAUTION: If there is any fault in the bearing, replace hub unit bearing.

Fig 4: Checking Bearing Play
Courtesy of SUBARU OF AMERICA, INC.