31 21 180 Replacing bearing for front wheel: Notes

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IMPORTANT:

There are 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.
See "installation note" on SPUR GEAR .

Fig 2: Identifying Collar Bolt And Compression Spring
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 Swivel Bearing Mounting Screws

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: Identifying Contact Surface Of Wheel Bearing And Swivel Bearing And Threaded Holes
Courtesy of BMW OF NORTH AMERICA, INC.