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L124C 02-27-2014 05:55 PM

Oil level too high?
Just changed the oil on my Yanmar 2GM20, and the cold oil level is about 1/4 inch above the high dip stick mark.:o
Will it hurt anything?

MarkofSeaLife 02-27-2014 06:15 PM

Re: Oil level too high?
1 Attachment(s)

I think you have to suck a bit out. Which is a pain while its cold.

Ain't boats grand? :rolleyes:

hellosailor 02-27-2014 06:17 PM

Re: Oil level too high?
Typically not, but if you are concerned, just drain out a little oil and then there's no risk at all.

gamayun 02-27-2014 07:32 PM

Re: Oil level too high?
I just took a diesel engine class, so I'm no expert in these things, but Google "run away diesel engines." Wikipedia says it's rare, but..."A runaway condition can also result from oil supplied by failure of the oil seals in a turbocharged diesel engine, from overfilling the crankcase with oil, or certain other mechanical problems..." The person who was teaching that class has seen it happen a couple of times and there's nothing you can do to turn the engine off from the key or ignition wire. You need to starve it of air, which is easier said that done. I'd remove the oil. Better to never find out what might happen.

hellosailor 02-27-2014 07:42 PM

Re: Oil level too high?
1/4" of oil will have nothing to do with a runaway engine. The oil level has to get high enough (typically several inches) to get sucked up past the piston rings, in order to be combusted. 1/4" of extra oil may contact the camshaft bearings, may cause a little foaming, but there's no way it will cause a runaway engine.

And given normal engine tolerances, and the extra leeway added for marine diesels operating at all angles and motions, the odds are 1/4" of oil will harm nothing.

Don't panic with thoughts of runaway engines, ain't gonna happen from this.

gamayun 02-28-2014 12:30 AM

Re: Oil level too high?
Yeah, I skipped right over that part about it being 1/4" above the dip stick line. That does seem pretty minor. But it also seems to me that foaming is exactly what you would not want to have in your engine...

TQA 02-28-2014 12:31 AM

Re: Oil level too high?
1/4 inch will be OK.

4 inches will not.

L124C 03-11-2014 03:03 PM

Re: Oil level too high?
For the record, I contacted the local Yanmar dealer and the mechanic assured me this would not be a problem. Thanks for all your input!

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