Re: '98 Hunter 376 Impeller
That's exactly what I did. I could never remove the impeller otherwise. I bought an inspection hatch with a waterproof seal from a chandlery (I think it was by Bomar from West Marine) and cut a hole in the wall through the wall from the head right beside the waterpump/impeller. Raise the engine cover before you make the cut so you don't damage it if you cut too deep. Measure a couple of times before cutting the hole to make sure the hatch is properly aligned with the impeller. It's still hard to change, but at least now it is possible.