When replacing the pistons: Remount all connecting rods

NOTE: TECHNICAL INFORMATION
Before determining the correct special tool for the installation of the snap ring of the pistons, the inner diameter of the piston pin must be determined.

NOTE: TECHNICAL INFORMATION
Wear safety goggles.

NOTE: The description is for one component only. The procedure is identical for all further components.

Equipment specification with piston pin with 12.0 mm inner diameter:
Use the special tools 2 463 754 , 2 410 685 and 2 447 297 to remove the piston from the connecting rod.

Courtesy of BMW OF NORTH AMERICA, INC.
Equipment specification with piston pin with 12.5 mm inner diameter:
Use the special tools 2 455 002 , 2 410 685 and 2 447 297 to remove the piston from the connecting rod.

Courtesy of BMW OF NORTH AMERICA, INC.
CAUTION:
Piston pin snap ring with preload.
Injury hazard!
- The use of the specified special tool for the disassembly or installation is mandatory.
- Wear safety goggles.
Courtesy of BMW OF NORTH AMERICA, INC.
Use the special tool 2 447 297 to remove the piston pin snap ring.
Insert the flat side (3) of the special tool into the groove (4).
Use the curved side (1) to grip and remove the piston pin snap ring (2).
Check

NOTE: TECHNICAL INFORMATION
Piston and piston pin are matched to each other.
Always install piston and piston pin together and do not switch by mistake.

Courtesy of BMW OF NORTH AMERICA, INC.
Check whether the piston pin (1) has noticeable play in the piston.
Check whether the piston pin (1) can be removed without excessive force.
Result

» The piston pin (1) is difficult to remove.

Piston pin (1) exhibits noticeable play.

Measure
Replace the piston (2) and the piston pin (1).
Replace the piston.
Parts: Piston

NOTE: TECHNICAL INFORMATION
Piston and piston pin are matched to each other.
Always install piston and piston pin together and do not switch by mistake.

Install piston pin (1) in piston (2) and connecting rod (3).

Courtesy of BMW OF NORTH AMERICA, INC.
CAUTION:
Piston pin snap ring with preload.
Injury hazard!
- The use of the specified special tool for the disassembly or installation is mandatory.
- Wear safety goggles.
Courtesy of BMW OF NORTH AMERICA, INC.
Position the piston pin snap ring (1) such that its opening in the marked area points to the piston crown (2).
NOTE: TECHNICAL INFORMATION
Before determining the correct special tool for the installation of the snap ring of the pistons, the inner diameter of the piston pin must be determined.
Equipment specification with piston pin with 12.0 mm inner diameter:
Preload the piston pin snap ring (1) with your thumb.

Push the piston pin snap ring into the piston at the same time with the special tools 2 410 685 and 2 463 754 .

Twist the special tool 2 410 685 and push the piston pin snap ring into the piston entirely.

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: TECHNICAL INFORMATION
Before determining the correct special tool for the installation of the snap ring of the pistons, the inner diameter of the piston pin must be determined.
Equipment specification with piston pin with 12.5 mm inner diameter:
Preload the piston pin snap ring (1) with your thumb.

Push the piston pin snap ring into the piston at the same time with the special tools 2 410 685 and 2 455 002 .

Twist the special tool 2 410 685 and push the piston pin snap ring into the piston entirely.

Courtesy of BMW OF NORTH AMERICA, INC.
Check whether the piston pin snap ring (1) is correctly positioned in the groove (2).
Check whether the marked opening of the piston pin snap ring is pointing in the direction of the piston crown (3).

Courtesy of BMW OF NORTH AMERICA, INC.