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

WARNING: This page is about a different car, the 2003 BMW X5, 2002 BMW X5, and 2001 BMW X5. However, it is still accessible from the selected car via links, so may be relevant.

(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. Only install new pistons in conjunction with new piston rings.Put aside piston rings in correct sequence and installation position. Only install new pistons in conjunction with new piston rings.

Fig 1: Removing Piston Rings

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

Install piston rings with "TOP" to piston top.

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

Fig 2: Identifying Piston Ring Types
Courtesy of BMW OF NORTH AMERICA, INC.

Measure axial play, refer to ENGINE - TECHNICAL DATA .

Fig 3: Measuring Axial Play
Courtesy of BMW OF NORTH AMERICA, INC.

Measure end clearance, refer to ENGINE - TECHNICAL DATA .

Fig 4: Measure End Clearance
Courtesy of BMW OF NORTH AMERICA, INC.