On the trip from Louisiana to Pensacola few weeks ago I was seeing 180-200F at cruise rpm. Normal is 160F.
Water out back looked normal. Usually it's a loose or worn belt. If I can turn the pump pulley by hand then it's the problem. This, in fact was the case. The pulley turned and I tightened the belt. Still overheated but not as much. Noticed the belt was down in the sheave. That is, the belt was below the tops of the sheave and there was black residue observed. Signs that belt needed to be replaced. Did so. Also checked raw water impeller. No issue there. Still overheating slightly. Pulled the thermostat and replaced it with one that I had tested that opened at 160F. Still overheating. Pulled end caps from exchanger. Saw a couple small pieces of zinc in one pass. Not bad. (Search "pbase heat exchanger" to see an exchanger with a really bad zinc issue.) Flushed all passes with blasts of dock water. Zinc pieces gone. Ran it 3+ hours today around Pensacola Bay and out into the Gulf, Temp stayed at 160F. Shot gooseneck several times with IR thermometer. Agreed with temp gauge within 2F each time. About 162-164F. Sometimes ya just gotta chase all the rabbits. Dennis C. Touché 35-1 #83 Mandeville, LA Sent from my iPhone _______________________________________________ This list is supported by the generous donations of our members. If you like what we do, please help us pay for our costs by donating. All Contributions are greatly appreciated!
