31 21 180 Replacing bearing for front wheel (all-wheel drive vehicle)

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IMPORTANT: There are/will be wheel bearings installed with a thread pitch of 1.5 mm or 1.25 mm (screw connection of wheel bearing on swivel bearing):

Make sure the allocation of the wheel bearing/screws is correct!
If applicable, check the thread pitch with a thread gauge.
Make sure that the torque allocation of the wheel bearing on the swivel bearing is correct!

Necessary preliminary work:

Remove FRONT WHEEL .

Release collar bolt (1), press brake pedal to floor for this purpose.

Tightening torque 31 60 2AZ .

Fig 1: Identifying Collar Bolt

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note:

Replace collar bolt (1) and compression spring (2).
- Pay attention to direction of installation of compression spring!
Keep collar bolt and spur gearing of bearing/output shaft clean and free of grease.
Follow installation note of the spur gearing.

Fig 2: Identifying Compression Spring And Collar Bolt
Courtesy of BMW OF NORTH AMERICA, INC.

Remove BRAKE DISC .

NOTE:

Check brake pads and replace if necessary!

Press output shaft on swivel bearing to one side slightly and release screws (1).

Tightening torque 31 21 1AZ .

Remove bearing.

Fig 3: Identifying Shaft Swivel Bearing Boot Screw

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note:

Replace screws.
Keep contact surface (2) of wheel bearing and swivel bearing clean and free from grease.
If the wheel bearing is not replaced, all the threaded holes (1) in the wheel bearing must be reconditioned.

Fig 4: Installing Wheel Hub
Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Note on installation must be observed without fail!

Installation note:

Spur gearing of bearing (1) and output shaft (2) must be installed tooth in tooth!
Tighten collar bolt with compression spring by hand.

Fig 5: Identifying Spur Gearing Of Bearing And Output Shaft Installed Position
Courtesy of BMW OF NORTH AMERICA, INC.
Check whether spur gearing is locked tooth in tooth by reciprocally rotating wheel hub/output shaft.
Tighten collar bolt.
Tightening torque 31 60 2AZ .