27 21 020 Replacing radial shaft seal for output flange (ATC 35L)

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

Special tools required:

IMPORTANT: After completing repair work, check TRANSMISSION OIL LEVEL and top up if necessary.
Use only the approved TRANSMISSION OIL .

Necessary preliminary tasks:

Disconnect PROPELLER SHAFT at gearbox, release center mount
Tie back propeller shaft to underbody
Note:
An excessive deflection angle of the propeller shaft may damage the joint/propeller shaft!
Support gearbox with jack when removing the transfer box.

Release circlip (1).

Fig 1: Identifying Circlip

Courtesy of BMW OF NORTH AMERICA, INC.

Release output flange with three-claw extractor tool.

Lever radial shaft seal out of housing with a suitable tool.

IMPORTANT: Do not damage housing.

Fig 2: Identifying Three-Claw Extractor Tool

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note:

Replace O-ring in output flange.

Check that O-ring is in correct position.

Fig 3: Identifying Output Flange Circlip

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note:

Coat sealing lips of new radial shaft seal with clean transmission oil.

Drive in radial shaft seal with special tool 27 1 440.

Fig 4: Pressing Radial Shaft Seal

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note:

Push on output flange
Press output flange towards the bottom using 2 screwdrivers.
Mount shim.
Continue pressing output flange towards the bottom until retaining groove is completely visible.
Fit circlip.

Fig 5: Pressing Output Flange
Courtesy of BMW OF NORTH AMERICA, INC.