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Farmall M - Correct Carb?

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Clarkbug

12-02-2007 20:49:14




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Quick question for someone who has seen more of these than me....

I have been looking at all of these pictures of carbs for an M lately in an attempt to diagnose my carb issues.

I noticed that the flange for the choke butterfly on my carb is on the side towards the engine. All of the other carbs I have seen either pictures of or for sale on eBay have the flange for this on the side facing out from the engine. (If that makes any sense)

Does anyone know why this might be? Do I have the wrong carb on my tractor at this point? Or did they come both ways?
Thanks in advance!

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Clarkbug

12-03-2007 14:41:42




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 Re: Farmall M - Correct Carb? in reply to Clarkbug, 12-02-2007 20:49:14  
No problem at all George. With all that knowledge stuck up there in your head, some of it is bound to come out upside down from time to time. You had the right idea for all of it, thats really what I was after.
John, that hose is actually a hydraulic hose installed by the previous owner. He put a "Hylo Jack" type snowplow pump on the front, and has a reservoir rigged up under the hood. I dont use the connection for anything now, but he had a homebuilt snowplow for the tractor, and that was his live hydraulics. I have more pics of that, but I didnt want to put the big one up here on the board.

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Clarkbug

12-03-2007 14:04:33




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 Re: Farmall M - Correct Carb? in reply to Clarkbug, 12-02-2007 20:49:14  
Thanks for all the info everyone!

But now Im a little more confused.
George said that if the linkage was on the inside, it was for an M. Then Rusty and Mike pointed out that it was the other way around.... (D Slater, is this what you were trying to say?)
There is a brass tag, but I have no clue what it says to be honest, and my tractor is a few hundred miles away right now, so I dont have a good way to go check on it.
Here is a pic of whats there now (except I replaced the hose between the carb and air intake tube)

third party image

Any other good words of wisdom after seeing that?

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D Slater

12-03-2007 14:41:16




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 Re: Farmall M - Correct Carb? in reply to Clarkbug, 12-03-2007 14:04:33  
Yes I was trying to nicely tell George he made a mistake,a M carb is opposite from the one in the picture. If the one you have works good I wouldn't be concerned unless you want it to be original. The bowl brassed up doesn't look the best though.



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John M

12-03-2007 14:17:59




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 Re: Farmall M - Correct Carb? in reply to Clarkbug, 12-03-2007 14:04:33  
Super M, etc carb. Whats that hose behind it there?



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City-Boy McCoy

12-03-2007 04:31:31




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 Re: Farmall M - Correct Carb? in reply to Clarkbug, 12-02-2007 20:49:14  
I'll add to what George said:
If the choke lever is on the outside, it is for an M. If the choke lever is on the engine side, it is for a Super M, or perhaps a Super H, a 400 or a 450. The super M/super H carb will have the idle adjust screw in the same location as an M carb (going in at an angle on the body above the bowl). A 400/450 carb will have the idle adjustment screw located high on the carb body - like way up on the manifold mounting flange.
Super M carb number on the brass tag is 356948R92; distillate/kero super M starts with 357xxx; super H starts with 358xxx; and 400/450 starts with something like 362173R91 and R92. A regular M gas carb number is 50983DC. A regular M distillate/kero carb starts with 47xxx.
If you have a Super M carb and don't want it, I want one for my super M. (I have a regular M gas carb.) Hope this helps. mike durhan

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D Slater

12-03-2007 06:58:23




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 Re: Farmall M - Correct Carb? in reply to City-Boy McCoy, 12-03-2007 04:31:31  
Mike, adding to your information the 400,450 distillate and kerosene carburetors have the idle air adjusting screw and choke lever located the same as a SM, also the 300 distillate and kerosene R91 carbs have the same. M,supers and above carburetors use the economizer slot type passages and throttle shaft and same type main nozzle that has threads on the nozzle for the nut to go on at bottom of bowl to retain it.The gas type 300 to 450 and some others don't use the economizer shaft and use a discharge nozzle with threads on upper end and the bowl has the threads tapped in it to retain. IH sold at least 2 power improvment packages for a farmall M and I think 1 for SM that changed metering in the carburetor and also with some internal passages being blocked off. Also 50983 carbs went to at least DD suffix with several small changes inside from a D suffix to DD. On these old carburetors its hard to tell what you have unless you measure all orfices and check passages after taking apart, also find someones put bigger venturi in and drilled jets in some.

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City-Boy McCoy

12-03-2007 09:17:19




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 Re: Farmall M - Correct Carb? in reply to D Slater, 12-03-2007 06:58:23  
D:
That's great information. I think I'll print it out and keep handy. Thanks. mike



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Clarkbug

12-03-2007 03:29:56




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 Re: Farmall M - Correct Carb? in reply to Clarkbug, 12-02-2007 20:49:14  
Thanks George!

I guess a lot of people have made that switch... I dont know if I have ever seen another carb with that linkage on the engine side except for mine. I was getting to feel like I was just different or something...



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D Slater

12-03-2007 04:05:16




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 Re: Farmall M - Correct Carb? in reply to Clarkbug, 12-03-2007 03:29:56  
Think George knows the correct answer but got mixed up. Most carburetors like yours unless the throttle body was replaced have a little round brass tag with a number for carb ID. Its located just to rear of where throttle tube from governor attaches to carb with 2 screws. If you post the # someone can tell you what the carb is for. Its not a original M one unless the bowl was switched.



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georgeky

12-02-2007 21:29:09




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 Re: Farmall M - Correct Carb? in reply to Clarkbug, 12-02-2007 20:49:14  
The one on the engine side is for the M. One on the outside is for 400/450. Lots of M's including both of mine have 400 carbs on them. Years ago when the M needed a rebuild folks went to those and 400 heads as well as over bore pistons to increase HP.



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RustyFarmall

12-03-2007 04:22:17




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 Re: Farmall M - Correct Carb? in reply to georgeky, 12-02-2007 21:29:09  
The super H, super M, 300,350,400, and 450 carbs all have the choke lever on the inside, next to the engine. The M carb has the choke lever on the outside, away from the engine. There basically is no difference in any of these carbs on the inside except for maybe the main metering stem which can easily be changed out from one carb to another.



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georgeky

12-03-2007 14:32:49




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 Re: Farmall M - Correct Carb? in reply to RustyFarmall, 12-03-2007 04:22:17  
I see I had things turned bassakwards. I do that from time to time. Good thing about having lots of us.



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