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Farmall & IHC Tractors Discussion Forum
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Float on an M Farmall Carb

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biggerred

01-21-2006 20:16:48




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I'd like to Jap Slap the BOZO who writes the instructions on aftermarket carb kits. I did get past the 3rd grade, but the measurements given in those instructions make no sense to me. If I hold the carb upright (apart of course) How far should the float drop? (distance from the casting to the bottom of the float)Thanks!!




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RustyFarmall

01-22-2006 10:12:08




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 Re: Float on an M Farmall Carb in reply to biggerred, 01-21-2006 20:16:48  
You have just discovered the big difference between a good quality rebuild kit, and a kit that came from the farm store. The rebuild kits from Case-IH have very detailed and explicit instructions. Likewise the kits from NAPA and Carquest. The kits from Tisco and A&I are downright shameful.



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Dave NE IA

01-21-2006 22:52:42




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 Re: Float on an M Farmall Carb in reply to biggerred, 01-21-2006 20:16:48  
A good rule of thumb is if you do not know, common sence would suggest a float should be level when the bowl is full. Has always worked for me. Dave NE IA



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the tractor vet

01-21-2006 20:27:15




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 Re: Float on an M Farmall Carb in reply to biggerred, 01-21-2006 20:16:48  
Now this is a bad thing for me to say that i realy don't worry about the massurement on the drop as long as the float drops and the needel does not fall out of the guide and the float setting is correct it will run and the float does not hang on the side of the bowl it good enough .



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old

01-21-2006 21:07:06




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 Re: Float on an M Farmall Carb in reply to the tractor vet, 01-21-2006 20:27:15  
Vet I agree with you, shoot I eye ball most of the carbs I rebuild and never have any problems with them.



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RustyFarmall

01-22-2006 09:10:41




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 Re: Float on an M Farmall Carb in reply to old, 01-21-2006 21:07:06  
The float drop spec is there for a reason. If the IH engineers felt it was important, I am sure not going to try and outguess them. I always follow those instructions to the letter.



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old

01-22-2006 09:31:14




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 Re: Float on an M Farmall Carb in reply to RustyFarmall, 01-22-2006 09:10:41  
I understand that rusty but also don't you believe in if it isn't broke don't fix it?? Most of the time the float is still right on as far as setting and thats why I just eye ball it. So far after 100s ofcarbs that I have rebuilt maybe 10 have been off and half of them had new floats put in and then yes I have to set them.



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RustyFarmall

01-22-2006 10:07:22




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 Re: Float on an M Farmall Carb in reply to old, 01-22-2006 09:31:14  
"If it ain't broke don't fix it". Obviously if you have the carb apart it must have been broken, or at the least not functioning properly, and if you already have it apart, isn't this the time to do it right? I have been rebuilding carburetors for just about 40 years now. I have never, and I mean never, found a carb that didn't need the float adjusted. It only takes about 5 minutes more to do it right.

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old

01-22-2006 12:01:55




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 Re: Float on an M Farmall Carb in reply to RustyFarmall, 01-22-2006 10:07:22  
Well I haven't worked on carbs for that long but almost. Don't get me wrong I do check the float and how its set. But I don't often need to adjust them, I do it most of the time by eye but I have a good eye for things like that.



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Janicholson

01-22-2006 10:31:07




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 Re: Float on an M Farmall Carb in reply to RustyFarmall, 01-22-2006 10:07:22  
Three reasons for a float drop spec.
The geometry of the float tang and the needle can exceed the angle that allows it to push into the seat. It gets jammed crooked in the seat bore if allowed too far out.
The float may touch the side of the bowl if allowed too far down, causing either or both the potential jamming of the float sideways, causing a stuck float, or wearing a hole in it from touching the bowl. (Brass and aluminum/zink also corrode if made from those metals)
The third is to pull the needle out of the seat far enough to assure full flow of fuel into the bowl.
The spec. is exact but in practice if the needle does not jam, the float does not touch, and the gas flows well it works.
JimN

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RustyFarmall

01-22-2006 11:00:24




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 Re: Float on an M Farmall Carb in reply to Janicholson, 01-22-2006 10:31:07  
I agree, but if you will take the time to bring the float adjustment into specs, then you are guaranteed that everything will function as intended.



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Randy-IA

01-22-2006 13:19:05




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 Re: Float on an M Farmall Carb in reply to RustyFarmall, 01-22-2006 11:00:24  
No one has addressed the fact that fuel has weight . It also isn't " sucked " into the airsteam , it's pushed by atmospheric pressure . There's a limit to how far atmospheric pressure can push fuel uphill so to speak . That's the reason behind the air bleeds -IE mixure screws - . Getting the fuel level spot on makes any engine run at it's peak efficiency and power . Seems to me that a slow rpm engine like in a tractor if the level was off some you'd never notice it . But it NEVER hurts to do it the right way does it ? ..Randy

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Janicholson

01-22-2006 18:27:15




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 Re: Float on an M Farmall Carb in reply to Randy-IA, 01-22-2006 13:19:05  
My post only references the drop spec. The level is critical for operation.....
JimN



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