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    Mercury blue band thunderbolt 50hp 1970’s

    I bought the boat last year, it ran fine and water was coming out the pipe fine. It only happened the once, I’m not sure when the impeller was last changed, I had asked a few companies near me if they’d do it and everyone said no as it’s an old engine….
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    Mercury blue band thunderbolt 50hp 1970’s

    It did over heat and stall yes. I noticed it wasn’t pumping water out the back of the engine.
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    Mercury blue band thunderbolt 50hp 1970’s

    Hi I was wondering if anyone could inform me of the best way to clean the water pipe that cools the engine? There seems to be a blockage
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