Replacement: Replacing all pistons
NOTE:
TECHNICAL INFORMATION
Wear safety goggles.
Wear safety goggles.
NOTE:
The description is for one component only. The procedure is identical for all further components.
- Use the special tools 2 455 002, 2 410 685
and 2 447 297
to remove the piston from the connecting rod.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.
- Use the special tool 2 447 297 to remove the piston pin snap ring.
- Insert the flat side (3) of the special tool 2 447 297 in the groove (4).
- Use the curved side (2) to grip and remove the piston pin snap ring (1).
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.
Result
» The piston pin (1) can only be removed with difficulty or the piston pin (1) has noticeable play.
Measure
- Replace the piston (2) and the piston pin (1).
Parts : Piston, piston pin
- Replace the piston (2) and the piston pin (1).
- To replace the piston, the piston pin length must be determined.
Engine Piston pin length Pistons B38M1 ECE 12x55 mm 8 678 931 B38M1 ECE 12.5X55 mm 8 678 931 B38M1 ECE 12X51 mm 9 494 399 B48M1 ECE 12x55 mm 8 678 931 B48M1 ECE 12.5X55 mm 8 678 931 B48M1 ECE 12X51 mm 9 494 399 B38M1 CN 12X55 mm 8 678 931 B38M1 CN 12.5X55 mm 8 678 931 B38M1 CN 12X52 mm 8 681 079 B48M1 CN 12X55 mm 8 678 931 B48M1 CN 12.5X55 mm 8 678 931 B48M1 CN 12X52 mm 8 681 079 B48O1 ECE+CN 12X55 mm 8 678 934 B48O1 ECE+CN 12.5X55 mm 8 678 934 B48T1 ECE+CN 12.5X59 mm 9 488 343 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 new piston pins (1) in the new piston (2) and the connecting rod (3).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.
- Position the piston pin snap ring (1).
The opening (mark) of the piston pin snap ring must point towards the piston crown (2).
- 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.
- 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 (mark) of the piston pin snap ring points towards the piston crown (3).