Re: 3hp id help
Gale was a division on OMC. You have heard of the other OMC motors, Johnson and Evinrude. However, except for the magneto and recoil starter, there is not too much the same. Still, you may find some parts at a J/E dealer...if you go in armed with the part number. The water pump impeller, properly called a "rotor" is available from Brian Wilcox at pfs-ware.com/impellers.htm
The rotor must be snug on the eccentric and just touching one side of the housing and a space between the rotor and housing on the other side, and just deep enough to fill the housing. The space moves as the rotor wobbles when rotating. Grease leaking out of the gearcase will cause the rotor to swell up and then it won't work.