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Case Tractors Discussion Forum
Show Parts for Model:

56 310 Roundnose Carb Float Mystery?

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rasman57

11-05-2013 05:04:38
69.35.216.185



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I bought a new Zenith carb for my 56 Case 310 Roundnose last year (Here on YT), and 50 hrs of running time later the tractor won't run unless mostly choked and when I turn the tractor off, the carb leaks gas bad and will empty the tank. Bowl is filling and gas just keeps right on comin? ........ OK, gotta be the float assembly I think, needle has to get pushed up to stop gas from entering the carb right? Hmmm maybe it is sticking partially and not enough gas can get in to allow normal running and then when the engine is not using the fuel, it continues to fill the carb and leaks out....... Removed the carb, cleaned it even though it really looked like new. Float and needle assembly moves freely and floats (no pinhole or seam tear). I could find no evidence of binding or sticking and could not make it hang up on the bench so it is spotless.... back on the roundnose it goes. I also removed the tank, cleaned it and sediment bowl. They looked fine and fuel flow to carb was excellent but I wanted to be sure. Clean gas, no leaks, starts right up and purrs and off I go for about 30 minutes..... then she wont run above idle unless choked and after stopping the engine, the gas continues to enter carb and will empty the tank again. Tapped on bowl with hammer while running and though maybe that old trick might work with no luck. Am I missin something? Seems to me the float assembly has to be suspect as it is the common point for not enough gas to run and not stopping the fuel flow after the engine is not using it?

I hate to replace parts without evidence but I am stumped. Sure don't want to buy another carb yet. Anyone have experience with a new Zenith from this site? Appreciate any thoughts you have.
This post was edited by rasman57 at 05:05:15 11/05/13.

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Ed Hamlin

12-11-2013 05:38:02
75.187.231.112



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 Re: 56 310 Roundnose Carb Float Mystery? in reply to rasman57, 11-05-2013 05:04:38  
Had my carb off 4 times, not wanting to remove the "TINY" brass plug under the Large high speed needle, in the bottom of the carb bowl, afraid that I would break/destroy it. After I removed it and blew the bowl out well. Re- assembled/installed the carb. It has run like a champ. Couldn't believe it was so simple. Hope this works for you. I also added an inline fuel filter to keep out any possible fine dirt.

Owner of a 1957 310, Backhoe/Loader, almost completely redone.

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jay-eye-see

11-05-2013 09:48:32
173.28.138.246



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 Re: 56 310 Roundnose Carb Float Mystery? in reply to rasman57, 11-05-2013 05:04:38  
Sounds like you are doing everything right, I always gently shake it back and forth to listen for the float moving. Iv had more than one apart twice before I got it right.



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jim_uny

11-05-2013 09:46:08
24.213.206.167



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 Re: 56 310 Roundnose Carb Float Mystery? in reply to rasman57, 11-05-2013 05:04:38  
i recently had problems w/ oliver 77 carb float setting on marvel tsx363. is similiar so make sure needle valve body and gasket are secured to carb preventing slow leak. make sure needle and valve body seem to fit and rotate freely and visually seal. get a good set of directions and set float height. i missed on mine that 1/4 inch was with gasket. take pussein blue or blue kote on sides of float and see that float is not contacting side of carb when assembled and no gas added. inspect that there are not burrs to rub against and lodge float. i did not bend tab but adjusted tang for height so that would not rub. the kits one buys now are very poor quality and tolerances are poor. it worked aok for a week. then stuck once. ran it and aok. on my ihc 400 i removed sediment bowl and installed a fuel filter / water separator and it work aok always. any spec of water, dirt or ice will affect needle sealing. once float is set you can adjust idle, low idle adjust and power. also check linkages that they are slide free and no rubbing. then make sure govenor settings are correct.

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tomturkey

11-05-2013 06:44:03
216.81.211.253



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 Re: 56 310 Roundnose Carb Float Mystery? in reply to rasman57, 11-05-2013 05:04:38  
What casecollectorsc says makes the most sense to me. I run 10% ethanol in all my gas engines. I don't have any fuel problems. Just my experience. gobble



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Just a Hunch

11-05-2013 06:32:14
199.156.182.2



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 Re: 56 310 Roundnose Carb Float Mystery? in reply to rasman57, 11-05-2013 05:04:38  
I have had the same problem on several tractors since they started adding Ethonol to the fuel. If you can find some Ethonol free fuel it will probably fix the problem.



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casecollectorsc

11-05-2013 06:02:37
75.102.168.197



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 Re: 56 310 Roundnose Carb Float Mystery? in reply to rasman57, 11-05-2013 05:04:38  
Float hanging up on the side of the bowl?? I have used a flap wheel on a die grinder to smooth the inside of the bowl...



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