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 provided only at one component. The procedure is the same for all other 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.

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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.

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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.
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Use the special tool 2 447 297 to remove the piston pin snap ring.
Insert the flat side (3) of the special tool in 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.

Check whether the piston pin (1) has noticeable play in the piston.
Check whether the piston pin (1) can be removed without excessive force.

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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: Pistons

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

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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.
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Position the piston pin snap ring (1) in such a way that the opening in the marked area of the piston pin snap ring points in the direction of 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.

Press the piston pin snap ring simultaneously with the special tools 2 410 685 and 2 463 754 in the piston.

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Add the special tool 2 410 685 in a rotating manner and press the piston pin snap ring completely into the piston.

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.

Press the piston pin snap ring simultaneously with the special tools 2 410 685 and 2 455 002 in the piston.

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Add the special tool 2 410 685 in a rotating manner and press the piston pin snap ring completely into the piston.
Check whether the piston pin snap ring (1) fits correctly in the groove (2) .
Check whether the opening in the marked area of the piston pin snap ring points in the direction of the piston crown (3) .

Courtesy of BMW OF NORTH AMERICA, INC.