Aligning piston rings

Aligning piston rings 

Courtesy of BMW OF NORTH AMERICA, INC.

• Align the contact points of all piston rings twisted by 120° each.

  The piston ring gaps must not be positioned in line with the axis of the piston pin (A).

  Piston ring	Alignment
  Lower oil scraper ring (O3)	12 o'clock position (1)
  Spring (O2)	4 o'clock position (2)
  Upper oil scraper ring (O1)	8 o'clock position (3)
  Central piston ring (K2)	12 o'clock position (1)
  Upper piston ring (K1)	4 o'clock position (2)

• Make sure that the spring (O2) does not overlap the piston ring gap (1).

  Courtesy of BMW OF NORTH AMERICA, INC.