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Functions carried out by piston rings

Piston ring functions: Gives a gas tight seal of clearances between piston ring and liner,the seal is brought about by the gas pressure behind and above piston rings,. For optimum sealing, condition of piston
ring,grooves and cylinder condition is important and rings must also move freely in grooves( coz of the small horizontal movements of the piston). this is ensured by regular scavenge port inspection.
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