REP-TAT-P-1125-14 Aligning piston rings

Aligning piston rings 

Courtesy of BMW OF NORTH AMERICA, INC.

1 12 o'clock position

2 4 o'clock position

3 8 o'clock position

A Axis of piston pin

K1 Upper piston ring

K2 Middle piston ring

O1 Lower oil scraper ring

O2 Spring

O3 Upper oil scraper ring

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

  Do not position contact points over axis of 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)
  Middle piston ring (K2)	12 o'clock position (1)
  Upper piston ring (K1)	4 o'clock position (2)

• Make sure that the spring (O2) at the contact point (1) does not overlap.

Courtesy of BMW OF NORTH AMERICA, INC.