27 21 020 Replacing Radial Shaft Seal for Output Flange (ATC 700)

WARNING: This page is about a different car, the 2010 BMW X5, 2009 BMW X5, 2008 BMW X5, and 2007 BMW X5. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required:

23 0 490
27 1 480, seeDRIFT

IMPORTANT: After completing work, check gear oil level and top up if necessary.
Use only approved gear oil. See27 00 ... Replenishing /Changing Transfer Case Oil (ATC 700) in this transfer box.

Necessary preliminary tasks:

Remove underbody protection. See51 47 491 REMOVING AND INSTALLING/REPLACING REAR UNDERBODY PROTECTION
Support transmission. See23 .. UNIVERSAL TRANSMISSION BRACKET
Release exhaust system bracket
Remove propeller shaft. See26 11 000 REMOVING AND INSTALLING PROPELLER SHAFT (INSERTED) COMPLETELY
Remove transmission cross-member. See22 32 050 REPLACING CROSS-MEMBER FOR TRANSMISSION MOUNTING

Release retaining ring (1).

Fig 1: Identifying Retaining Ring

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

Replace O-ring in output flange.

Check that O-ring is in correct position.

Fig 2: Identifying O-Ring In Output Flange

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: The propeller shaft may move when the output flange is pushed on. The retaining ring can thus no longer be fitted.

Installation:

Push on output flange
Using 2 screwdrivers, press output flange downwards or output shaft (2) upwards until groove for retaining ring is completely visible.
Fit retaining ring.

Fig 3: Pressing Output Flange Downwards Or Output Shaft Upwards
Courtesy of BMW OF NORTH AMERICA, INC.

Drive a hole into radial shaft seal (1) using a center punch (2).

IMPORTANT: Do not use a drill as drillings may result in transmission malfunction.

Fig 4: Identifying Radial Shaft Seal And Centre Punch

Courtesy of BMW OF NORTH AMERICA, INC.

Screw in special tool 23 0 490 .

Drive out radial shaft seal (1) with impact weight (2).

Fig 5: Identifying Radial Shaft Seal And Impact Weight With Special Tool (23 0 490)

Courtesy of BMW OF NORTH AMERICA, INC.

Drive in radial shaft seal with special tool 27 1 480 DRIFT .

Fig 6: Identifying Radial Shaft Seal With Special Tool

Courtesy of BMW OF NORTH AMERICA, INC.

Add final details to vehicle.

Check oil level.

Check transmission for leaks.