Necessary preliminary work

• Removing all PISTONS 

Install new connecting rod bearing shells.

Install one blue bearing shell (1) and one red bearing shell (2) in each connecting rod.

Install PISTON  .

Fig 1: Identifying Blue Bearing Shell And Red Bearing Shell

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note: 

The bearing shells on the connecting rod are coded.

Connecting rod bearing cap (1): the red bearing shell is fitted and the fastening notches are on the left and right sides of the bearing shell (see arrows).

Connecting rod (2): the blue bearing shell is fitted and the fastening notches are one side of the bearing shell (see arrows).

Fig 2: Locating Red Bearing Shell Fastening Notches And Blue Bearing Shell Fastening Notches

Courtesy of BMW OF NORTH AMERICA, INC.