27 21 020 Replacing radial shaft seal for output flange (ATC 45L)

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Special tools required:

27 1 440

IMPORTANT: After completing repair work, check TRANSMISSION OIL LEVEL and top up if necessary.
For this transfer box, use approved TRANSMISSION OIL only.

Necessary preliminary tasks:

Remove PROPELLER SHAFT .

Release circlip (1).

Fig 1: Identifying Retaining Ring

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 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

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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.