31 51 065 Replacing O-ring for bearing block (AWD)

Necessary preliminary tasks: 

• Remove BEARING SUPPORT .

Lever out O-ring (1) from bearing block (2) with a screwdriver.

Installation note: 

Insert O-ring (1) in groove and coat with front axle differential oil.

Replace RADIAL SHAFT SEAL .

Fig 1: Identifying O-Ring And Bearing Block

Courtesy of BMW OF NORTH AMERICA, INC.