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post #12 of Old 05-12-2009
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I have a Perkins 4-108 and some years ago experienced overheating of the engine. I had good raw water flow and the thermostat was working properly. Even when removing the heat exchanger there was no blockage in the tubes. However I did clean out the tubes with muric acid and then rodded them, reinstalled it and engine ran cooler. It was just the low efficiency of the heat transfer causing the problem. One other comment is that water is a better heat transfer media than 100% anti freeze so make sure that you have a 50-50 mix.
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