27 21 020 Replacing radial shaft seal for output flange (ATC 350)

WARNING: This page is about a different car, the 2011 BMW 750xi, 2011 BMW 750Lxi, 2010 BMW 750xi, and 2010 BMW 750Lxi. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required

27 1 440

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

Necessary preliminary tasks:

Disconnect PROPELLER SHAFT at gearbox, release center mount
Tie back propeller shaft to underbody

IMPORTANT:

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: Removing Output Flange Using 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 O-Ring

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: Installing Radial Shaft Seal Using Special Tool (27 1 440)

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note:

Push on output flange
Press down output flange using 2 screwdrivers
Shim
Continue pressing output flange down until retaining groove is completely visible
Fit circlip

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