Question about 1983 Chevrolet K1500

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Piston Rings got mixed up

I don't know which ones is the 1st & which one is the 2nd compression ring.

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  • yadayada
    yadayada May 11, 2010

    go to any parts store that has a machine shop, they will be glad to show u.

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  • 2,692 Answers

Put the ring backward into the grooves and you wil be able to tell which fits.

Posted on Jan 12, 2009

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The term "o-ring" usually is in reference to some sort of rubber or neoprene ring that serves as a gasket or seal for something. Pistons do not have o-rings, but they do have piston rings. There are usually three or more rings on each piston. They are split rings of steel that are inserted into grooves of the outer circumference of the piston. They seal the piston to the cylinder walls and prevent the air/fuel mix from getting past the piston into the crankcase and prevents the crankcase oil from being sucked into the cylinders. With the pistons rings, the cylinders would not have sufficient compression to do their job effectively. Rings can and do break from time to time. This can cause degradation of performance or in the worst-case scenarios, serious cylinder damage.



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The oil rings prevent the block pressure and oil slop from being drawn up into the cylinder. The piston creates a siphon action and the oil rings prevent the oil from climbing the cylinder walls. All it takes is for the rings to rotate around the piston and have the ring ends line up.

That is why you offset the rings on installation from 90 to 120 degrees. It staggers the gaps of the rings for a better seal. Now you can get oil vapor if the compression rings line up to allow compression into the crankcase through the gaps on the piston rings.

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