11 25 530 Removing and installing/replacing all pistons (N62): Installation

WARNING: This page is about a different variant/trim than selected.

Installation of pistons is described separately from removal. The assembly sequence for removal and installation is different.

If necessary, replace connecting rods.

NOTE: The conrods can also be replaced individually.
The piston pin must be able to be pressed through the liner by hand with little force and must not display any significant play.

Fig 1: Installing Piston Pin

Courtesy of BMW OF NORTH AMERICA, INC.

Prior to installation, measure piston installation clearance:

Measure piston diameter with micrometer at measuring point A from lower edge of piston and offset by 90° to piston pin axis.

Fig 2: Measuring Piston Diameter With Micrometer

Courtesy of BMW OF NORTH AMERICA, INC.

Adjust micrometer to cylinder bore of engine block. Set internal caliper on micrometer to zero. Measure bottom, center and top of cylinder bore in direction of travel and direction of engine rotation.

Diameter of cylinder bore.

Piston installation clearance.

Total permissible wear tolerance.

Fig 3: Measuring Cylinder Bore Diameter

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: The pistons and conrods of cylinders 1 to 8 are identical.

CAUTION: The conrods of cylinder banks 1 to 4 and 5 to 8 are mounted to the pistons differently.