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Thread: Oil on Plugs

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    thompsdw's Avatar
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    Oil on Plugs

    On a dry oil sump naturally aspirated MR1 engine, is there any way for oil to end up in the cylinder other than rings and oil seals on valves?

    I know this sounds like a stupid question, but I have good compression and doubt the valve seals. Head gasket? This is on a twin engine yamaha boat and both engines have the same symptom so it would have to be a hell of a coincidence. It has been babbied (I am the original owner) since new and has less than 100 hours.


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    THE PLATE MAN JIM'S PERFORMANCE's Avatar
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    Quote Originally Posted by thompsdw View Post
    On a dry oil sump naturally aspirated MR1 engine, is there any way for oil to end up in the cylinder other than rings and oil seals on valves?

    I know this sounds like a stupid question, but I have good compression and doubt the valve seals. Head gasket? This is on a twin engine yamaha boat and both engines have the same symptom so it would have to be a hell of a coincidence. It has been babbied (I am the original owner) since new and has less than 100 hours.
    if you have to much oil it will come out the breather fill your air filter and then be sucked into the engine.

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    THE PLATE MAN JIM'S PERFORMANCE's Avatar
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    thompsdw's Avatar
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    Air filters clean. Im baffled. Looked like oil, right color, right consistency. Compression: Port - 190, 195, 190, 200 ; Starboard - 200, 195, 200, 195. Not sure what to think at this point, but this tells me the bottom end is Ok. I have a hard time thinking that the oil seals are worn out at sub 100 hours the way I have babbied this thing.

    Im beginning to think I have a serious drinking problem and fogged it and don't remember.

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