Necessary preliminary work

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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.