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Overheating Engine
Maybe this is only me, but I can''t see how overheating is related to "a stuffing box that set too tight". The engine might not turn the RPMs but I can''t imagine that it would overheat.
I do think you touched on a number of posibilities. A clogged exhaust elbow is another possibility as well. I would start at the intake valve and make sure it is open and free of debris. Then move up to the intake water strainer. Those two are pretty easy to check. Obviously the impellor is pretty easy to check as well. The fresh water filler cap is on the top of the heat exchanger. Most have a separate reservoir that is bulkhead mounted and that is connected to the heat exchanger with a rubber hose. You can recognize the overflow bottle by its anti-freeze color. Actually add new water or anti-freeze at this reservoir.
Jeff
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