David,
I just re-did 2 each 12hp West Bends. The part number for my impeller housing is the same as the one in your pic 901060. The impellers I used were part number Sierra 18-8903 or Mercury f436065. I had a problem getting the water to circulate with the new Sierra impellers. When I would use the old OEM ones like in your pic I would get a good flow of water when I would use the new ones I wasn’t getting any water to flow through the engine. I made 2 thin gaskets to go under the impeller pump housing and under the stainless plate that sits under the impeller pump housing I believe the pump was sucking air possibly due to just 3 screws used in pump housing (Note in parts manual it doesn’t show gaskets). Also check to see how tight your pump housing fits on the copper tube it connects with. Mine were loose and someone had used rubber grommets on one of mine to get a snug fit. You can mod the pump housing and use a omc part number 302497 you can see it in pic I posted. You have to drill out the pump housing to get it to slide in snug and drill 2 holes on the side for the tits on the omc rubber grommet. Also shrink rap can be used on your existing set-up to get a snugger fit on the pump housing to copper tube if it is fitting just a tad loose.
The pic I used isn’t mine I pulled it off ebay.
I hope this helps.
Joe
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