Carb mystery

I talked with Gary a few days ago about my TSX 241 rebuild (Thanks, Gary, it works great! Put it on the 9N since the 8 isn't running now). My main question was about the throttle shaft not having the normal brass retainer ring and rubber seal in it, instead it has a brass bushing pressed into the body. The new shaft fit in very snug with no side-to-side movement, and since I couldn't get the bushing out I left it. The choke shaft had the ring and rubber seal instead of the ring and fuzzy packing. I replaced it with the ring and fuzzy packing as Henry made it. As I said all works fine.

I took the carb from the 9N (a TSX 33) and upon taking it apart I discovered it is exactly the same way as the other, brass bushing in the throttle shaft and ring and two rubber seals on the choke shaft. There was the fuzzy packing on the throttle shaft between the bushing and the throttle lever. Difference between the two carbs is I know where this one came from... I bought this carb rebuilt from the local Ford tractor dealer 20 yrs. ago when I first got the tractor. The 241 was on the 8N when I bought it at a sale a couple of years ago and I have no knowledge of what had been done to it.

My theory is that whomever was doing rebuilds for Ford was doing them this way. I suspect the 241 was an older rebuild too and probably from a Ford dealer (no internet ordering in those days, kiddies!).

Anyone else run into this? Really had me confused since none of the literature had mentioned the brass bushing on the throttle shaft as something I might see and Gary indicated he hadn't seen that either (although Gary can certainly speak for himself).

Just a wild guess here, but did those carburetors have any kind of replaceable bushing for the throttle shaft when they were new? If not, maybe the area where the throttle shaft fits became worn enough that even a NEW throttle shaft wouldn't fit good and snug anymore, so the original hole was drilled out and a brass bushing installed?

They had a rubber bushing/seal that was held in by a small brass retainer. I suppose if those were worn enough the shaft might wear the throttle body, although I'm not sure what would wear more, the brass shaft itself or the carb body (not up on my metallurgy)?

Maybe this was supposed to be an upgrade... are the carbs on the NAA and 100 series like this (have a solid bushing)?

(quoted from post at 11:22:30 09/21/12)
They had a rubber bushing/seal that was held in by a small brass retainer. I suppose if those were worn enough the shaft might wear the throttle body, although I'm not sure what would wear more, the brass shaft itself or the carb body (not up on my metallurgy)?

Maybe this was supposed to be an upgrade... are the carbs on the NAA and 100 series like this (have a solid bushing)?

Click to expand...

The Farmall H and M carbs all have brass bushings from the factory. The throttle shaft is usually the first to wear out, but eventually that bushing needs replaced also. I've rebuilt several that had way too much play even with a brand new shaft, so then I replace that bushing.

For what it's worth, the new bushings I use have Ford part numbers on the package.