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What is blow bye in a gas engine?

Updated: 10/20/2022
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11y ago

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It's when either fuel is pushed past the rings and into the oil pan, or when oil is sucked out of the pan past the piston into the chamber. when the combustion cycle (the power stroke)it forces the piston down blowby is a term used when the piston and pistons rings fail to seal this expanding ignited fuel and air mixture causing some of the ignited mixture to pass a bad sealing cylinder and escaping into the out crankcase. a quick way to test is remove oil cap with engine running and exhaust gasses will pump out the valve cover if overhead cam motor make sure oil does not s[lash on you if you can see the camshaft just cover the oil fill hole with a rag to test for pressure blowby. i you suspect do a compression test to locate weak cylinder also oil gets dirty and smells like fuel even a few miles after a oil change.check for bad fuel injectors or fuel pressure regualtor. if good remedy rebuild engine

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