Thread: Oil on Plugs
07-29-2012, 09:02 AM #1
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.
07-29-2012, 02:14 PM #2
07-29-2012, 02:14 PM #3
07-29-2012, 06:39 PM #4
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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