Sounded like a kids bike with playing cards in the spokes. That and a bunch of rusty stuff coming out of the exhaust. Hmmm, I know what this means.
I pulled the blower off and this is what I see... New assembly is around $350 bucks on line
No fins, all that is left is the disk.
Out to the shop I go. Found an old draft inducer with a bad housing (Did not take any pictures of it)but a good fan. Bad news, the fan is crimped on. Since it was the only one I had I drilled out the shaft and got the fan off of it.
Of course with the rust the old fan, or whats left of it will not come off. The set screw is stripped to top it off. I chucked it up in the mill and went to town. I figured if I could mill the screw off I could get the plate off.
Plate came off with a bit of a struggle. But, it did come off. I had to clean up the shaft a bit.
Now to solve the bigger part of the problem. The replacement fan did not have a set screw provision as it was a crimped on affair. I was not sure I could get a drill bit down to the boss to drill and tap a hole. It turns out I was able to drill and (just) tap the hole for the screw.
All fixed and ready to re-install. I used a cap screw instead of a set screw as, 1 i did not have a 10-32 set screw handy and 2, I wanted something to get vice grips on the next time I have to remove this thing.