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

Special tools required: 

• 23 0 490
• 27 1 480

Attention! 

After completing work, check GEAR OIL LEVEL  and top up if necessary.

Use only approved transmission oil for this transfer box.

Necessary preliminary tasks: 

• Remove PROPELLER SHAFT .
• Release exhaust system bracket.
• Remove CROSS MEMBER .

Release circlip (1).

Fig 1: Output Flange Circlip

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note: 

Replace O-ring in output flange.

Check that O-ring is in correct position.

Fig 2: Output Flange O-Ring

Courtesy of BMW OF NORTH AMERICA, INC.

Attention! 

The transmission shaft may move when the output flange is pushed on. The circlip can thus no longer be fitted.

Installation note: 

• Push on output flange.
• Using 2 screwdrivers, press output flange downwards or output shaft (2) upwards until groove for circlip is completely visible.
• Fit circlip.
  Fig 3: Pressing Output Flange Downwards Using Screwdrivers

  Courtesy of BMW OF NORTH AMERICA, INC.

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

Attention! 

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

Fig 4: Driving Hole Into Radial Shaft Seal Using Center 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: Driving Out Radial Shaft Seal With Impact Weight

Courtesy of BMW OF NORTH AMERICA, INC.

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

Fig 6: Driving Radial Shaft Seal With Special Tool 27 1 480

Courtesy of BMW OF NORTH AMERICA, INC.

Reassemble the vehicle.

Check oil level.

Check transmission for leaks.