86 10... Disassembly of left and right wheel boxes

Remove sealing compound (1).

Drill out rivets (2).

Raise side apron (3). Pull out wheel box (4) towards rear.

Installation: 

Use Sikaflex 221 as sealing compound.

Fig 1: Identifying Sealing Compound, Rivets, Apron And Wheel Box

Courtesy of BMW OF NORTH AMERICA, INC.