View Full Version : Converting Cooling from Raw Intake to Closed System

03-31-2009, 10:35 PM
"I want a boat that I can use in salt and fresh water. Most of the sailboats in my area are fresh water boats cooled by raw water intake. Most of the engines are Atomic 4 gas, Universal diesel, or Yanmar diesel. Is it feasible, mechanically and/or economically to convert to a closed cooling system or is the better route to get a replacement engine that comes with a closed system?"

04-01-2009, 06:50 AM
"There is a manufacturer in Florida that sells kits to convert to fresh water cooling for around $5-600. Assuming you are handy, you can do it yourself.
For what it is worth, stay away from inboard gas engines like the Atomic 4."

04-01-2009, 08:07 AM
Once an engine has been operating in sea water it builds up a scale. This is difficult to get rid of when you convert to Fresh Water Cooling systems. Often causing blockages. Sen Dure is a FWC aftermarket heat exchanger company and they make the kits. You will find most new engines have this FWC system as a standard.