Re: Impeller – key vs pin to shaft

[Don]

quote t2stroke:

Not to steal your post, but since you have been through this I am fixing to go into the same thing, but in reverse. I have a RDSL-26R (’64-40hp) that I am going to put a RXE-13 (’65 33hp) gearcase on. I will be changing the driveshaft from the long engine into the short shaft. I plan to just cut the woodruff key to drive the wider impeller. I think that is the way to go. The 40hp has the dual bypass water pump. Is all of that done in the water pump? The gearcase hsg. shows the different part numbers Johnny_inFL mentions. Does anyone know what the differences are that cause this part number change? The internal parts are the same as far as I can tell. Just wondering what I am getting into. The A/V plate is all broken off the 40hp from a whale tail application.

Dan in TN

Dan
yeah, the innards are the same, but the housings are different cuz of the different style water pumps. The 40hp uses the two tube/return system, where the 33hp uses the one tube system. I’m pretty sure the gearcase housing has some of the passages for the return system, it is not just the water pump assy. Is the screw pattern the same? Even if it is, I don’t think the 33hp gearcase housing will work properly on the 40hp, have a look at the water passages under the SS impeller plate.