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Bubble in oil Mariner 115 4 stroke

E

enzoNC

New member
Hello, everybody, when the engine is running at idle, if remove the oil level, there is some oïl spray who go out the hole is it normal?

And on the oïl level there is some air bubble is it normal?

In a car, it's seem like compresion failure, piston rings failure but my engine ad only200 hours


Thanks for your reply
 

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Check the dipstick after the engine has stopped for a couple minutes pulling it while the engine is running tells you nothing. The oil looks nice and clean if it dont smell like fuel and at the proper level your good to go.
 
why, is there air bubble in oïl
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Because the oil is aerated from slinging around inside crankcase...
why little oil spray when remove the oïl level?
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This is called blow-by, which occurs when some gases from combustion leak past the rings and into the crankcase, causing pressure to build up in the crank case. All 4 stroke engines do this from lawn mowers to 1000hp drag cars....
 
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