| David; IIRC correctly this string started with an overheating problem? The water coming out of the exhaust is raw water. That side of the cooling system general has only the through hull, the water strainer, the heat exchanger, and the exhaust elbow; all connected by various hoses. I believe you have addressed everything except the heat exchanger. Have you cleaned out the tubes in the heat exchanger? If you sail in salt water they get deposits over time. For my 36hp Westerbeke that is a routine maintenance item every two or three years. For my engine the cleaning tool is a bronze brush intended for the barrel of a .22 rifle that I bought at a sporting goods store. The fresh water side of your engine (which actually cools the engine) has the thermostat, if it has one, the heat exchanger takes the place of the radiator in your car. The fresh water side of the system is just like your car engine. My engine has a coolant recovery tank - which makes monitoring the level of the coolant easy. Not all engines have one. If you have addressed everything in the raw water side of the problem and it still overheats, it may be time to look at the freshwater side of the engine. Rick Brass Imzadi. 38mkll La Belle Aurora 25 mkll Washington, NC Sent from my iPad On Jul 23, 2025, at 7:02 PM, Jonathan Tebbens via CnC-List <cnc-list@cnc-list.com> wrote:
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