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    Johnson 4.5 overheat problems

    Hi guys,thanks for all help on Merc 7.5,changed impeller and i have a fine engine. New problem,my Johnson 4.5 starts fine when cold,pees,then water fluctuates between cool and hand burning!!! side plate gets too hot to touch,peeing is still ok however.Pointers please before I strip her down...
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    4.5 seahorse (1983)

    engine starts and runs ok,however stream after 5 mins or so,becomes scalding-almost steam.point me in right direction guys pls????
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    86 mercury 7.5 lower leg removal

    i cannot get the lower leg off,undone 6 x bolts at top,and 2 x bolts at bottom-wont shift-is big hammer that neccessary action???
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