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Westerbeke w13a running too cool
Hi Gang, I have a Westerbeke w13a in my Cal 28-2. This year, I decided to replace all the hoses, the impeller, the rusty old water heater, the thermostat, and the water temp sensor (because I broke the old one). The only item that really needed changing was the water heater, the rest was all preventative. Here's my problem. When I first launched the boat, I motored her to her summer port and the temp gauge showed a nice steady 180 degrees as it should. I had nice hot water coming from the fresh water taps.. All seemed wonderful. Next time out, temp didn't go much above 110-120. Seemed odd, but I didn't really run it very long. Yesterday I was forced to motor nearly 10 miles at about 2500-2800 rpm. Gauge still read in the 110-120 range. Hot water is still nice an toasty, exhaust is nice and clean, all seems perfectly fine except the temp gauge is reading too low.
Anyone have any thoughts? I am slightly suspect of the temp sensor because the new one is very different in design than the original, but it did seem fine on my first trip of the season.
Any input is appreciated. Thanks..