Rebuilding the water pump on my Farmall and when it came to the fan hub, I was very surprised how they manufactured this. Looking at the picture, A is a threaded half pully for adjusting the belt tension. B is the other half and is press fit on shaft D. Until I blasted it clean I was under the assumption that they were relying on the press fit to hold B in place. Then I noticed the end of the tapered pin C installed in the B and D parts. It was bothering me and I was scratching my head that they would rely on a press fit for something that had pressure against it and rotating. I guess the pin works but it seems like a boy out to do a man's job. A circle clip would be my choice for the insurance of not having the part back off along with some sort of key for driving it.
Also note, there is no hole to access the pin to drive it out on the other side of the sleeve.
Also note, there is no hole to access the pin to drive it out on the other side of the sleeve.
