Prop Replacement, apply pressure?

[dmasher]

Hi all, quick question: I have a 9.9 hp Gamefisher on my dingy. It has been a good "dingy" motor. It is from Sears not sure who the oem is. Anyway I got a new prop for it from sears. Same part number and specs. It seems that the shaft is a bit big for the prop to receive it. My question is do I apply pressure to install a new prop? It looks like the material that would be in contact with the shaft is softer than the rest of the prop...<br /><br />Thanks in advance!<br /><br />David

 

[Jack Shellac]

Re: Prop Replacement, apply pressure?

I've never seen a prop that didn't just slide on, but then I'm not familiar with this motor either. How is it attached to the shaft? Splines, shear pin or what?

 

[dmasher]

Re: Prop Replacement, apply pressure?

Hi Jack, it is attached by splines I believe. They are like ribs running the lenght of the shaft. They are evenly distributed around the shaft. The prop has the slots to receive them but is about 15% too small. I could use pressure and push it on...<br /><br />Thanks

 

[Jack Shellac]

Re: Prop Replacement, apply pressure?

If the prob hub is made of softer material and you're sure it's the right part [or the only one you can get], I believe I'd grease the shaft up good and press it on. It may be made to fit this way, for all I know. I'd pull it off every year and re-grease the shaft, though. Maybe some of the guys who have some experience with this motor will come along and give a better answer.

 

[dmasher]

Re: Prop Replacement, apply pressure?

I just need one person to agree with me and I'm there ;-) Thanks, I'll see if anyone else replies in a day or two, then it's off to the press!!!<br /><br />Thanks again for the quick response,<br /><br />David<br /><br />ps I'll let you know what breaks ;-)

 

[sparkroost]

Re: Prop Replacement, apply pressure?

At best size on size will press on. 15% difference smaller will not fly. How would you get it off?????

 

[dmasher]

Re: Prop Replacement, apply pressure?

Well there was no pressing it on, not only would it have been tough to get off but I might have damaged something in the lower unit. I did figure out that I could, with a great deal of pressure, push the hub out of the old prop and the new prop and swap them. The hub has a rubber bushing that is glued and wraps around it. It is not glued into the prop, just pressure fitted... I was able to use a vise and swap them. Worked like a charm. Old hub in great shape pressed into the new prop.<br /><br />Thanks for you help and advice,<br /><br />David