Hi Dennis, If the overheating comes back you might want to look at the exhaust mixing elbow. Mine seemed OK until it clogged completely and cost me a pump and hose too.. If your belt looked overworked that may have been a sign of a clog at the elbow. I had asked several folks before including a well known mechanic, everyone dismissed it saying things like: Your boat is fresh water they don't clog like that etc, etc..
Not so. After doing like you and going through everything else I finally resolved myself to wrestle the elbow out of the boat. It was completely clogged. The trick to get the elbow out relatively easily is to unbolt the riser off the manifold and pull all as a unit. When I bought the elbow I also bought the riser from Mastery, they practically gave it to me as the have a bunch of take-offs from installs. See the picture of the offending elbow vs new one here: https://www.flickr.com/photos/133565480@N04/20929831945/in/datetaken/ https://www.flickr.com/photos/133565480@N04/20741860288/in/datetaken/ As mentioned is was pretty much completely clogged I could not get any water through using a garden hose.. No wonder my pump died trying. -Francois Rivard 1990 34+ "Take Five" Cumming, GA 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. Touch? 35-1 #83 Mandeville, LA Sent from my iPhone
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