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  1. F

    Leaking water at base gasket

    Just put together my mercury 3.9 after a complete rebuild. When its running there is a little water in the lower cowel. Looks like it is coming from the base gasket. I originally used permatex aviation form-a-gasket on both side of the gasket let it sit for 3 days before I started the motor ...
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    Mercury 3.9 fuel pump rebuild

    Currently chasing down a fuel issue with my mercury 3.9. When rebuilding my fuel pump the new rebuild kit has an extra gasket (the one at the bottom of the picture that’s solid with the two small holes in the middle) that wasn’t on the pump when I disassembled it. Does anyone know where this...
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    Mercury 3.9hp compression range

    Hello. Trying to diagnose a no start on a 3.9hp outboard. Was getting 60psi off a cold motor compression test. Does anyone know the range this motor is supposed to be at. Manual just says it’s supposed to be within a certain range of the other cylinders, but this is a single cylinder motor so i...
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