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

WARNING: This page is about a different car, the 2005 BMW Z4, 2004 BMW Z4, and 2003 BMW Z4. 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.

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 With Piston-Ring Compressing Pliers

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: Installing Piston Rings
Courtesy of BMW OF NORTH AMERICA, INC.

Measure axial play .

Fig 3: Measuring Axial Play

Courtesy of BMW OF NORTH AMERICA, INC.

Measure end clearance .

Fig 4: Measuring End Clearance

Courtesy of BMW OF NORTH AMERICA, INC.