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Home >> BMW >> 2005 >> 525i Automatic >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine - Repair (M54) >> Piston With Rings And Pin >> 11 25 671 Replacing piston rings on all pistons (M52 / S52 / M52TU / M54 / M56)

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.

Fig 1: Removing Piston Rings
G03260577Courtesy 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 With "TOP" To Piston Top
G03260578Courtesy of BMW OF NORTH AMERICA, INC.

Measure axial play.

Fig 3: Measuring Axial Play
G03260579Courtesy of BMW OF NORTH AMERICA, INC.

Measure end clearance.

Fig 4: Measuring End Clearance
G03260580Courtesy of BMW OF NORTH AMERICA, INC.
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