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

WARNING: This page does not describe the selected car, but rather 16 other vehicles, including the 2006 BMW 330Ci, 2005 BMW 330xi, 2005 BMW 330i, 2005 BMW 330Ci, and 2004 BMW 330xi. 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 A Piston-Ring Compressing Pliers
G03123313Courtesy of BMW OF NORTH AMERICA, INC.

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
Fig 2: Installing Piston Rings
G03123314Courtesy of BMW OF NORTH AMERICA, INC.

Measure axial play.

Fig 3: Measuring Axial Play
G03123315Courtesy of BMW OF NORTH AMERICA, INC.

Measure end clearance.

Fig 4: Measuring End Clearance
G03123316Courtesy of BMW OF NORTH AMERICA, INC.
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