Yanmar 2qm20 oil out breather - 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 09-20-2010
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Yanmar 2qm20 oil out breather

Hi I have a Yanmar 2qm20 motor and have been using it for about 4 years now. Lately, after starting the motor, after a few seconds oil will start squirting out of the breather which is located just above the fuel injection pump. The motor sounds normal yet oil is being squirted all over the engine room. Could anyone tell me what the problem is and what would be possible solutions? Do I have to haul the motor out of the boat for repairs? Would be immensely grateful for any info...
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Old 09-20-2010
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There's probably a crankcase vent hose that runs from the valve cover to the breather. Try pulling that off the breather cannister and see if that's the source of your oil.

Typically the engine is meant to suck in these fumes along with combustion air, and it eventually all goes out the exhaust.. engines with failing rings can develop "blowby" which tends to pressurize the crankcase and may lead to excess oil getting to the breather...

That said, I'm not real familiar with that engine so I, too, could be blowing smoke!!
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Sounds like blowby to me as well.
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Old 09-24-2010
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Thanks very much, your advice has put me on the right track. Motor to be taken out on next hard standing... I shall certainly frequent this forum more...
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You might want to get a mechanic to do a compression test before pulling the engine. If it is blow by the engine will have low compression which means rings. The engines are easily rebuildable. I have a Yanmar tractor with virtually the same engine. I rebuilt it myself for about $1,000. These engines are virtually industructable. My Endeavour has the same engine.
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