Join Date: Jan 2007
Location: Alta Loma, Ca.
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I had a similar problem with the Universal X25 in my 86 Catalina 30 just after I bought her 3 years ago. Water raw water flow looked good but after 5 minutes of normal operation the temp would be climbing over 200 degrees. After checking the impeller and the raw water flow going into the heat exchanger which was good, I checked the flow coming out of the heat exchanger. It was much less. Took the heat exchanger in to a radiator shop to have it boiled out but it was toast. Installed a new exchanger and have had no problems since. Although, I take the exchanger apart every year to make sure there are no zinc bits laying around that could cause problems. I also use a pellet gun cleaning kit to clean the exchanger tubes to make sure they are clear. When you take the end caps off you need to replace the gaskets, you can get these at any marine engine supply store. Also, do not forget about the Heat Exchanger zinc as they do not last long.
Long Beach, Ca.
s/v Namaste - 86 Catalina 30 , Tall Rig
The optimist expects the wind. The pessimist complains about the wind. The realist adjusts the sails.