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    1986 Merc 350 exhaust overheat

    I have a 1986 Merc 350 that the engine stays cool but one side of the exhaust overheats. There is more water coming out of one side of the thru-hull exhaust than the other side that gets hot. I have inspected the tee-valve assembly with the 2 balls and 2 springs but it seems OK. Anyone know...
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