31 21 180 Replacing bearings (wheel hub) for front wheel

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

Remove front wheel.

IMPORTANT: Expand turning lock sufficiently to avoid damaging thread when releasing collar nut.

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

Installation:

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 60 2AZ .

Secure collar nut on flattened area (2) of drive shaft by positive peening.

Fig 1: Identifying Collar Nut On Flattened Area

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Remove brake disc . See 34 11 220 REMOVING AND INSTALLING OR REPLACING BOTH FRONT BRAKE DISCS .

Remove front pulse generator . See 34 52 525 REPLACING ONE FRONT PULSE GENERATOR .

Release screws (1) and remove bearing from output shaft.

Installation:

Replace microencapsulated screws.

Tightening torque 31 21 1AZ .

Fig 2: Releasing Output Shaft Screw

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Use special tool:

Hydraulic unit - 81 64 2 155 744

Adapter kit 1 - 81 64 2 155 745

Adapter kit 2 - 81 64 2 155 746

Adapter - 81 64 2 318 661

The following operations describe the procedure for pulling the wheel bearing/wheel hub off the output shaft:

Fig 3: Pulling Wheel Bearing/Wheel Off Output Shaft

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The following tools are required to pull the wheel bearing/wheel hub off the output shaft; see Fig 3 for arrangement:

I Drive flange hub

II Wheel carrier/swivel bearing

1 Hydraulic unit

E3 Washer M24

F3 Spindle M24 (length 270 mm)

C1 Holding sleeve

K2 Screws M14 x 1.5

B1 Adapter

Pull wheel bearing off the drive shaft using the hydraulic tool.

IMPORTANT: Secure wheel bearing with flange-mounted special tool to prevent it from falling.

Installation note: Keep contact surface (2) of wheel bearing and swivel bearing clean and free from grease.

Fig 4: Identifying Tapped Holes

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The following operations describe the procedure for pulling the wheel bearing/wheel hub onto the output shaft:

Fig 5: Pulling The Wheel Bearing/Wheel Hub Onto The Output Shaft

Courtesy of BMW OF NORTH AMERICA, INC.

The following tools are required to pull the wheel bearing/wheel hub onto the output shaft; see Fig 5 for arrangement:

I Drive flange hub

II Wheel carrier/swivel bearing

III Output shaft

1 Hydraulic unit

E1 Holding sleeveM24

D1 Washer

F2 Spindle M24 / M20 (length 335 mm)

G4 Adapter M22 x 1.5 to M20

IMPORTANT: Risk of damage! The G4 special tool sleeve used has relatively thin walls due to its technical requirements. So that the load limits of the clamping sleeve are not exceeded when pulling in the output shaft, the adapter 81 64 2 318 661 must be used together with a torque wrench.

Fit adapter with torque wrench to hydraulic unit. Set torque wrench to 20 Nm. Pull wheel bearing/wheel hub with hydraulic tool onto output shaft until the torque wrench is triggered.

Fig 6: Drawing In Output Shaft

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