Enter Carlos at Blanco Brothers, 446 S Union Ave, Los Angeles, who calls himself the Last of the Mohicans. Times have changed, however, and finding a willing radiator shop was a struggle. But this time I wanted a pro to “boil out” the Hx. I’ve used muriatic acid (phosphoric acid is better) in the past, and it’s not difficult to observe the deposits boiling away and control the reaction by eyeball. Heat exchangers suffer a buildup of scale over time, and cleaning them requires an acid wash. Those fossilized pencil zincs cut flow by at least half. Anyhow, cleaning out the heat exchanger is routine maintenance and mine had not been removed since 2012. There’s a bucket test to see how much water is expelled with the exhaust in, say, one minute. Recently I concluded that the volume of water coming out was less than previously. The sporadic spray of water and exhaust proves the cooling system is working, which is why we check it every engine start. The water lift muffler accepts the hot exhaust and water, then burps it into the long hose that goes to the transom. Our cooling systems send raw water from the heat exchanger into the exhaust system at the exhaust elbow. Also, I didn’t like seeing a lot of steam at idle. Lately, above 2300 rpm, the temperature began to rise.
When I took over Thelonious II four years ago, the boat would run at near seven knots all day at 180 degrees on the engine temperature gauge. Solution: clean heat exchanger, optional general upgrade. Temperature RPM limitation at Wide Open Throttle.
Symptoms: Apparent decrease in water volume at exhaust.
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