Re: 1955 3 hp seaking
The rotor must be the same thickness as the depth of the housing, and fit closely to the eccentric on the inside, and just touch the housing at some point on the outside. There should be a space on the opposite side from where it touches. As the shaft turns, the space appears at the intake side, and progresses around to the outlet side, where it disappears. Then it appears again at the intake side. Each time it goes around, it takes a gulp of water with it and pushes it up the outlet/water tube to the powerhead.
The tab at the top has nothing to do with it other than separating the intake and outlet sides, and preventing the rotor from spinning.
Early models had holes in the propeller, which forced-fed water to the pump. Later models had a propeller hub slightly larger than the gearcase, which caused a scoop effect from forward motion to feed water to the pump.
