Piston Ring: Service and Repair

11 25 671 - Replacing piston rings on all pistons (M52/S52/M52TU/M54/M56)

(piston removed)





Remove piston rings with a piston-ring compressing pliers.

Note:
It might not be possible to find the identification on used piston rings.
Put aside piston rings in correct sequence and installation position.
Only install new pistons in conjunction with new piston rings.





Installation:
Install piston rings with "TOP" to piston top.

1. Plain compression ring
2. Stepped compression ring "Top"
3. Slotted oil ring with hose spring clip





Measure axial play.





Measure end clearance.