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Re: Marvel Carb throttle shaft cause this?

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Alan K

07-07-2014 07:43:58

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Worn throttle shafts can cause hunting and erratic rpms. I believe there wasn't a bushing in them originally, but not sure.

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Jeff in ND

07-08-2014 17:21:58

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 Re: Marvel Carb throttle shaft cause this? in reply to Alan K, 07-07-2014 07:43:58  

Partially cleaned it up just now and removed the throttle shaft. Does not appear there is a bushing in there now. The shaft is egg shaped about 0.006" from what appears about 0.278" dia as measured near the unworn end by the lever arm. I stuck a 9/32 drill bit in the carb casting (0.281") and its a free fit that does not have a lot of slop. But not completely snug either. Not sure how tight is this supposed to be?

There is a brass ring pressed into the end I suppose from looking at exploded pix I found to be for keeping a felt washer in there. I think that felt must be long gone.

The drill bit fits with less slop than that shaft so maybe a new shaft and felt seal will take care of this w/o needing to bore out the casting and press in a bushing? It can't be any worse at least I suppose.

BTW, there is a brass tag with "TSX 97" and below that a "1" on one side of the rivet and "51" on the other. Is that a date code for Jan 1951? This is a '48 Z and originally had the louvered side panels. I don't have any recollection of the carb on this being changed but my memory only goes back to the mid 70s (born '66). This tractor was bought new by my grandfather. Could well be a replacement from back then.


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07-15-2014 11:43:21

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 Re: Marvel Carb throttle shaft cause this? in reply to Jeff in ND, 07-08-2014 17:21:58  
Most likely the shaft is the problem rather than the body. I would try to find a replacement shaft and put a kit in with rubber seals in place of the felt ones. Some kits may include a shaft but if not try McDonald Carb & Ignition or Matt at Motec

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Alan K

07-09-2014 07:17:40

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 Re: Marvel Carb throttle shaft cause this? in reply to Jeff in ND, 07-08-2014 17:21:58  
Yes that is the date on the carburetor so if it is a 48 Z it more than likely was changed. Generally the throttle shafts are supposed to fit snug yet move freely. A slight bit of play in it is better than not enough.

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07-08-2014 19:37:23

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 Re: Marvel Carb throttle shaft cause this? in reply to Jeff in ND, 07-08-2014 17:21:58  
A good machinist could put bushings in your carburetor, but that would be a pretty big expense.
Coming up with a new throttle shaft may be a problem. Herschel-Adams (I think it was) used to have a kit with the throttle shaft in it, back in the '90s. but I haven't seen a source for that kit for years.

What I suggest is get the carburtor kit for that TSX 97 from NAPA. Their kit has a rubber boot to take the place of that felt seal. I am pretty sure with one of those in there performance will improve. I don't think you can use the boot and the brass retainer in there together, though.

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