crank case pressure

[Randy Barre]

I have a 3gm30f Yanmar engine in my sailboat and i have pressure in my crank case pushing my dipstick out. I have been told to check the vent to make sure it is not clogged. Can anyone help me find the vent? Engine runs fine, no smoke, but this problem just began after a long trip. I have checked the top of valve cover and the tube leading to the breather it is all clear. I also have oil leaking rear of engine where the engine meets the transmission. Does anyone have any ideas. Thanks

[sailormed]

Take off valve cover and look on the inside of the breather tubing. There should be a mesh on the tubing. It is possible this mesh is clogged.

[Randy Barre]

thanks for answering me back I will give that a try and let you know how it goes

[Calif.Ted]

The breather is a square black plastic cover on the rear of the valve cover, and is probably source of oil leak. See diagram #9 of the attached parts manual.
https://j109.org/docs/Yanmar-3GM30-parts-catalog.pdf

[GordMay]

Greetings and very belated welcome aboard the CF, Randy.