31 21 180 Replacing Bearing (Wheel Bearing) For Front Wheel

31 21 180 - Replacing bearing for front wheel (AWD)





Special tools required:






Important!
Bearing cannot be dismantled.

Do not wash out bearing.





Remove front wheel 36 10 300 Removing or Installing Front or Rear Wheel.

Important!
Expand turning lock sufficiently to avoid damaging thread when releasing collar nut.

Release collar nut; to do so, press brake pedal to floor.





Remove front brake disk.

Force drive flange with special tools 33 2 116 33 2 110 Removal and Installation Tool / 33 2 201 33 2 200 Fixture, 33 2 160 33 2 160 Spacer Ring, 33 4 200 33 4 200 Tool Kit / Striker Fixture and 5 wheel bolts out of wheel bearing.

Note:
Rounded inside edge of special tool 33 2 160 33 2 160 Spacer Ring must point to drive flange.

Detach inner wheel bearing race from drive flange.





Remove swivel bearing 31 21 090 Removing and Installing/Replacing Left or Right Swivel Bearing and clamp with aluminium clamping jaws in vice.





Important!
The bearing was destroyed when the wheel hub was removed and must not be reused!

Lift out retaining ring (1).





Pull out bearing with special tools 31 2 113, 33 4 261, 33 3 266 and 33 3 261.

Note:
The bearing can be forced out of the swivel bearing on a press.

Check dust sleeve, replace if necessary.





Important!
Keep press-fit areas clean and free of oil and grease.

Wider chamfer (1) of bearing must point to swivel bearing!

Clean new bearing on press-fit area and bearing seat in swivel bearing.





Align bearing by way of wider chamfer to swivel bearing and draw in up to stop with special tools 31 2 113, 22 1 018, 33 4 262 and 33 3 261.

Note:
The bearing can be forced out of the swivel bearing on a press.





Install new circlip (1).

Note:
Make sure circlip (1) is correctly seated.





Draw in wheel hub (1) up to stop with special tools 31 2 113, 33 3 268, 33 3 266 and 33 3 261.





Install swivel bearing 31 21 090 Removing and Installing/Replacing Left or Right Swivel Bearing.

Draw output shaft into wheel hub.

Install front brake disk.

Install front brake calliper.





Replace collar nut, oil collar nut/wheel bearing contact surface only and tighten down.

No oil permitted on thread of shaft journal or collar nut.

Tightening torque 31 21 2AZ 31 21 Wheel Bearings And Steering Knuckle.

Secure collar nut by positive peening on flat areas of output shaft.

Install front wheel 36 10 300 Removing or Installing Front or Rear Wheel.