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

WARNING: This page is about a different car, the 2011 BMW X6 and 2010 BMW X6. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required:

81 64 2 155 744
81 64 2 155 745
81 64 2 155 746
81 64 2 318 661

IMPORTANT: Bearing can not be dismantled.
Do not wash out bearing.

Necessary preliminary tasks:

Remove FRONT WHEEL

IMPORTANT: Expand anti-twist lock sufficiently to avoid damaging thread when releasing collar nut.

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

Tightening torque 31 21 2AZ .

Installation note:

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.

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

Fig 1: Locating Collar Nut

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Remove BRAKE DISC

Release screw (1) and pull pulse sensor out of bore.

Tightening torque 34 51 3AZ .

Installation note:

Clean bore for pulse sensor and lubricate with Staburags NBU 12/K lubricating grease.

Release screws (2) and remove holder from swivel bearing.

Fig 2: Identifying Pulse Sensor Screw And Holder Screws

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NOTE: Output shaft has been removed only for the purpose of creating the picture.

Release bolts (1) and remove wheel bearing.

Tightening torque 31 21 1AZ .

Installation note:

Replace screws.

Fig 3: Identifying Wheel Bearing Bolts

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Use special tool, see BMW Workshop Catalogue.

Hydraulic unit - 81 64 2 155 744
Adapter kit 1 - 81 64 2 155 745
Adapter kit 2 - 81 64 2 155 746

The following work steps describe pressing out the output shaft/wheel bearing

The following tools are required to press out the output shaft from the drive flange, see graphic for arrangement:

Vehicle components

I	Drive flange hub
II	Wheel bearing/swivel bearing

Necessary components

1	Hydraulic unit
E3	Washer M24
F3	Spindle M24 (length 270 mm)
C1	Holding sleeve
K2	Screws M14 x 1.5
B1	Adapter

Fig 4: Pressing Out Output Shaft / Wheel Bearing

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Secure output shaft against falling out.
Press out output shaft with hydraulic unit.

IMPORTANT: Do not damage inner race (1) of wheel bearing.

Installation note:

Keep contact surface of swivel bearing and wheel bearing clean and free from oil and grease.

Fig 5: Identifying Inner Race Of Wheel Bearing

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The following work steps describe drawing in the output shaft/wheel bearing

The following tools are required to fit the output shaft in the drive flange, see graphic for arrangement:

Vehicle components

I	Drive flange hub
II	Wheel bearing/swivel bearing
III	Output shaft

Required components for all models and types

1	Hydraulic unit
E1	Holding sleeve M24
D1	Washer
F2	Spindle M24/M20 (length 335 mm)

Components specific to model and type (thread diameter, output shaft)

G1	Adapter M22 x 1.5 to M20
G2	Adapter M24 x 1.5 to M20
G3	Adapter M27 x 1.5 to M20

Fig 6: Fitting Output Shaft In Drive Flange

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IMPORTANT: Risk of damage!
Due to the technical requirements, the special tool used, sleeve G,* is relatively thin-walled. So that the load limit of the clamping sleeve is not exceeded when pulling in the output shaft, you must use the adapter 81 64 2 318 661 together with a torque wrench.

Fit adapter with torque wrench to hydraulic unit (see graphic).

Set torque wrench to 20 Nm.

Draw in output shaft with hydraulic tool until the torque wrench is activated.

Fig 7: Fitting Adapter With Torque Wrench To Hydraulic Unit

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