33 21... Pressing output shaft out of drive flange and drawing in

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Necessary preliminary work:

Remove REAR WHEEL .
Remove REAR AXLE FINAL DRIVE .

IMPORTANT: Always place a new circlip on the output shaft reinstalling!

If necessary, remove visual protection cap (1).

Fig 1: Removing Visual Protection Cap

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Expand anti-twist lock sufficiently to avoid damaging thread when releasing collar nut (1).

Activate parking brake and release collar nut (1).

Tightening torque 33 41 1AZ

Installation note:

Lightly oil gearing on shaft journal.

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

Replace collar nut (1) and secure by positive peening at flat areas of output shaft.

Use special tools:

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

Fig 2: Identifying Collar Nut

Courtesy of BMW OF NORTH AMERICA, INC.

The following work steps describe pressing out the output shaft:

The following tools are required to press out the output shaft from the drive flange, see Fig 3 for arrangement:

Vehicle components:

I	Drive flange hub
II	Wheel carrier/swivel bearing

Required components for all models and types:

1	Hydraulic unit
E3	Washer M24
F3	Spindle M24 (length 270 mm)
C1	Holding sleeve
K1	Screws M12 x 1.5
K2	Screws M14 x 1.5
B1	Adapter

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

Fig 3: Pressing Output Shaft From Drive Flange Using Special Tools

Courtesy of BMW OF NORTH AMERICA, INC.

The following work steps describe drawing in the output shaft:

The following tools are required to fit the output shaft in the drive flange, see Fig 4 for arrangement:

Vehicle components:

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

Required components for all models and types:

1	Hydraulic unit
E1	Holding sleeveM24
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

IMPORTANT:

Risk of damage!

Due to the technical requirements, the special tool sleeve G* is relatively thin-walled. To ensure that the load limit of the tensioning sleeve is not exceeded when drawing in the output shaft, it is essential to use adapter 81 64 2 318 661 in combination with a torque wrench.

Fig 4: Installing Output Shaft From Drive Flange Using Special Tools

Courtesy of BMW OF NORTH AMERICA, INC.

Fit adapter with torque wrench to hydraulic unit (see Fig 5).

Set torque wrench to 20 Nm.

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

Fig 5: Fitting Adapter And Torque Wrench To Hydraulic Unit

Courtesy of BMW OF NORTH AMERICA, INC.

Tighten collar nut (1), activate parking brake for this purpose.

Tightening torque 33 41 1AZ .

Installation note:

Replace collar nut (1), apply a light coating of oil to collar nut contact surface and tighten.

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

Secure collar nut (1) by positive peening at flat areas of output shaft.

Fig 6: Identifying Collar Nut

Courtesy of BMW OF NORTH AMERICA, INC.