27 21 020 Replacing Radial Shaft Seal For Output Flange (ATC 35L)

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Special tools required:

27 1 440

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 Retaining Ring

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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: Releasing Output Flange Using Tool

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Installation note:

Replace O-ring in output flange.

Check that O-ring is in correct position.

Fig 3: Identifying O-Ring

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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)

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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: Pushing Output Flange
Courtesy of BMW OF NORTH AMERICA, INC.