Aerio L4-2.3L (2006)
5) Install piston rings to piston:
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As indicated in figure at the left, 1st and 2nd rings have "RN" or "R" mark respectively. When installing these piston rings to piston, direct
marked side of each ring toward top of piston.
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1st ring (1) differs from 2nd ring (2) in thickness, shape and color of surface contacting cylinder wall.
Distinguish 1st ring from 2nd ring.
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When installing oil ring (3), install spacer first and then two rails.