Yanmar YSM8 Oil Leak - SailNet Community

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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel
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Diesel This is a forum dedicated to diesel engines and their applicable accessories.


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Old 09-12-2012
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Yanmar YSM8 Oil Leak

My YSM8 diesel runs like a million bucks. No smoke at all comes out of the exhaust. Water flows through good and out the exhaust. But.....under load (over 2500 rpms) it leaks a lot of oil. After 3 or 4 hours of motoring I lose over half my oil. I don't see anything leaking when running the motor at the dock under no load. Does anyone have any experience with oil leaks on this antique beast?
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Old 09-12-2012
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Re: Yanmar YSM8 Oil Leak

I assume the oil ends up in the bilge? There are fluorescent dyes that show up in UV light:

Tracer Products TP34000601 UV Fluorescent Leak Detection Dye - Set of 6 : Amazon.com : Automotive Tracer Products TP34000601 UV Fluorescent Leak Detection Dye - Set of 6 : Amazon.com : Automotive



that should show where on the engine the oil is leaking from.

Paul T
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Re: Yanmar YSM8 Oil Leak

probably going out the exhaust pipe and into the water worn rings will do that if you are not finding oil in bilge check the crankcase tube going into intake breather see if its full of oil
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