27 21 010 Replacing radial shaft seal for drive flange (ATC 350)

WARNING: This page does not describe the selected car, but rather 15 other vehicles, including the 2015 BMW Alpina B7L xDrive, 2015 BMW Alpina B7 xDrive, 2015 BMW 750i xDrive, 2015 BMW 750Li xDrive, and 2014 BMW Alpina B7L xDrive. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required:

23 0 490
27 1 430

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

Necessary preliminary tasks:

Remove TRANSFER CASE .

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 1: Driving Hole Into Radial Shaft Seal Using Center Punch

G04745123

Courtesy of BMW OF NORTH AMERICA, INC.

Screw special tool 23 0 490 into radial shaft seal.

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

Fig 2: Driving Out Radial Shaft Seal With Impact Weight Using Special Tool

G04745124

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 1 430.

Fig 3: Driving In Radial Shaft Seal Using Special Tool (27 1 430)

G04745125

Courtesy of BMW OF NORTH AMERICA, INC.

Reassemble the vehicle.

Check TRANSMISSION OIL LEVEL .

Check transmission for leaks.