Oil in antifreeze

Apr 14, 2011
2
Hunter 46' Townsville
This season I noticed a small amount of oil in the antifreeze in the heat exchanger on my Yanmar JH Diesel engine.
I am looking for cause and remedy if any?
 
Mar 20, 2012
3,983
Cal 34-III, MacGregor 25 Salem, Oregon
look at your oil cooler...

oil in the antifreeze is usually due to old faulty cooler seals, or a cracked oil cooler... second guess would be a head gasket.

the oil pressure being higher than the water pressure, if there is a breech between the two systems, the oil will be pushed into the water....
 
Aug 15, 2014
114
Catalina 36 Deale, MD
On automobiles, the opposite is true when the engine is off after running. Is there signs of foam on the oil dipstick?
 
Apr 14, 2011
2
Hunter 46' Townsville
Thanks for the input,no foam or milkiness on the dipstick,engine's only done 1100 hrs so will look at the cooler first.