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The rings seal the space between the piston and the walls of the combustion chamber, so that there is enough compression of the fuel-fair mixture. They also prevent engine oil from being sucked up into the chamber, which is why blue smoke is a warning sign of bad rings.

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Q: What is the purpose of the piston ring on a petral engine?
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You have to disassemble the entire engine, remove the piston and check the rubber ring around that piston.


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