How to distinguish the first and second piston rings?
1 Answers
The first ring is bright, white, and thick, while the second ring is dark, black, and thin. Generally, the shiny one is the first ring, and the darker one is the second ring. The cross-section of the first ring is cylindrical or trapezoidal, while the second ring is mostly rectangular. There are letters or numbers marked on the piston rings, which should face upward during installation. Usually, the side with letters or numbers should be installed facing up.