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 530i, 2002 BMW 530i, and 2001 BMW 530i. However, it is still accessible from the selected car via links, so may be relevant.

Piston removed, refer to 11 25 530 REMOVING AND INSTALLING OR REPLACING ALL PISTONS (M52/S52/M52TU/M54/M56) .

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

Measure axial play. Refer to 11 25 Pistons with Rings and Pins M54 B 30 in ENGINE - TECHNICAL DATA .

Fig 3: Measuring Axial Play

Courtesy of BMW OF NORTH AMERICA, INC.

Measure end clearance. Refer to 11 25 Pistons with Rings and Pins M54 B 30 in ENGINE - TECHNICAL DATA .

Fig 4: Measuring End Clearance

Courtesy of BMW OF NORTH AMERICA, INC.