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What could be the problem after i put in new valves seals and new piston rings there is oil coming at a piston?

8 valves engine with 2 plug at each piston.

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Sounds like you have a motor for a Cessna 150 / airplane which looks like a vw engine except it has two plugs with two different magnetos to run them. Come in 4/6 cylinders usually with one central carburetor. Double check position for gaps in piston rings and that there in the right places. If not offset correctly the compression will be low and pass/dump oil into cylinder. Also check the cylinder sleeves for cracks. I would recommend that you try using die penetrant inspection kit if you cant find the source. The sleeve is installed in cylinder heads. And cylinders can be removed from main body for inspection/replacement on a Cessna engine. And if I'm right about the motor you got then you can probably look up info on motor. Any airplane part has 100% traceability and you can get down to who made it, what part of world the rock was minned to make the engine and even a sample of material will be on file along with quality testing and any other information they have on it which should be all of it. Good luck with it.

Posted on Nov 09, 2014

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