MEO FUNCTION IV Miscelleneous

What things you will check or observe during Scavenge Inspection?

  • Check Piston Rings for Micro-Seizure

Causes and symptoms of piston ring seizure

lf, over a period of time, the oil film partially disappears, SO that dry areas are formed on the cylinder wall, these areas and the piston ring surfaces will, by frictional interaction, become finely scuffed and hardened, i.e. the good “mirror surface” will have deteriorated.

In case of extensive seizures, sharp burrs may form on the edges of the piston rings.

Effect of piston ring seizure

A seized surface, which has a characteristic vertically-striped appearance, will be relatively hard, and may cause excessive cylinder wear.

Due to this hardness, the damaged areas will only slowly disappear (run-in again) if and when the oil film is restored. As long as the seizure is allowed to Continue, the local wear will tend to be excessive.

Seizure may initially be limited to part of the ring circumference, but, since the rings are free to “turn’ in their grooves, it may eventually spread over the entire running face of the ring.

The fact that the rings move in their grooves will also tend to transmit the local Seizure all the Way around the liner surface.

About the author

Anand Gautam

Anand Gautam is a marine engineer, Graduated from M.E.R.I. Mumbai. He likes to sail onboard ship and is one who is passionate about his job. He loves to share his knowledge, information, and ideas to everyone in a simplified way just for his satisfaction.

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