jazzaD1, as nice1guv has mentioned above, I'm guessing there's a hint of loctite in there somewhere, as the waterpump looks relatively new.
Hitting it, or beating hell out of it as I have done so far, is no problem :D
Getting enough grip to get the benefit of the hitting/beating/chiselling is the problem:(.
I have bent screwdrivers, several other tools of flat, metallic appearance, and several fingers. Not quite sure where to go next.

