OMC Saildrive 15 hp
I know it was a Johnson 15 hp power head the shop comfered that when I had the damn thing overhauled. Also it was,''t that much bigger than the power head on my mercury 9.9 I have now.The water pump was on a pump belted to a pulley on the drive shaft before it went down into the transmission. It was the best thing about that system no empeller to pull the boat out of the water to replace.I can''t imagin that yours would be built with an empeller water pump. The Honda power head on the Saildrive 280 is great I am after them for a way to us a heat exchanger instead of sea water cooling. And 4 stroke beats a 2 anyday!! You OMC is a 2 right?