Re: Where to find Goodyear 5HP water pump parts?
The rubber should be a close fit on the eccentric. It should just touch the outer housing at some point. On the opposite side, there should be a space, about 1/8". It should be exactly the thickness as the depth of the cavity in the housing. As the rotor wobbles around when the shaft turns, that space moves from the inlet side to the outlet side, taking a gulp of water with it. When the space disappears at the outlet, the water is squeezed up the water tube, then the space reappears at the inlet and takes in another gulp of water. The tab separates the outlet from the inlet, so it should be a reasonably close fit, but not necessary to be real tight either. The tab has nothing to do with pumping the water, the moving space does that.
The usual problem is grease leaks out of the gearcase, and grease causes the rubber rotor to swell.
