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Old 07-13-2016, 07:41 AM   #1
Dougcole's Avatar
City: Carrabelle, FL
Country: USA
Vessel Name: Morgan
Vessel Model: '05 Mainship 40T
Join Date: Jan 2008
Posts: 1,020
Nuisance oil leak yanmar

Both of my motors, Yanmar 4HLA-STP, 240 Hp, 600 hours, have developed a small oil leak that is showing up in the same spot. I get maybe 1/4 to 1/2 ounce on the diaper just under the forward port corner of the oil pan after about 20 hours run time. No drip when the motors aren't running.

Not a huge deal, but I would like to eliminate it. Any idea of where to look for the cause?

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