Questions tagged [piston-ring]

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Is there an easy way to confirm piston rings are broken?

My old 2009 car nearly eats more oil than gasoline (I have to top up every few hundred miles). Common causes can be leaks or it is burned due to leaky piston rings. My car was standing for over three ...
divB's user avatar
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Engine has minor blowby but doesn't change with more RPM

I opened up the oil cap and it had a steady and minor air movement outwards the fill tube. I wouldn't even say pressure, I just feel the air move. Also it doesn't change when I rev the engine. Should ...
J. Doe's user avatar
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What is the purpose of expander/spacer in the oil control ring?

I was reading about oil control rings in the piston ring topic. Most modern engines use a 3 piece design for oil control rings where you have top rail, bottom rail and spacer-expander (sandwiched ...
Abhishek P G's user avatar
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Which piston rings affect compression/seal?

Do only the top two piston rings, which are thicker and each sits in their own lands, affect the compression and sealing of the combustion chamber, or do the bottom three AKA "side rails" ...
amphibient's user avatar
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Effect of engine oil on piston rings

I reassembled my pistons and put new rings in. After some trouble with leaky valves, I re-ground them, sealed them tight, and put the head back on. I was getting pretty good leakdown results (using an ...
amphibient's user avatar
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Clipping oversize oil expander ring

I am installing new piston rings and had to go with oversize filed down to spec because the standard had gaps too big. The ends of the oversize oil expander seem like they are overlapping when placed ...
amphibient's user avatar
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Cleaning piston ring grooves

My piston ring grooves had quite a bit of (oily?) gunk settlement. Is it appropriate to clean them with a dental pick? Is there risk to scratching them? My assumption is not since it is not a gasket ...
amphibient's user avatar
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2 votes
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Does substantially increased compression test numbers after adding oil to the cylinder necessarily imply that piston rings and/or cylinder bore is bad

SOLUTION: The tubes on the top of the motor for the PCV system were backwards. See https://invidious.fdn.fr/watch?v=07ssRI8k81E for correct configuration. Oil would pool in the air intake until you ...
user73135's user avatar
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Piston ring gap

Does this look like too big of a gap on my old to compression piston ring? It measures more than 0.04" (I stacked a 0.02 and a 0.021 feeler gauges together) but I could not find a specification ...
amphibient's user avatar
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