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Case Tractors Discussion Forum
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DC carb problems

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trains39

07-23-2005 16:35:24




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I have a '48 DC that I was able to recently start. I have rebuilt the carb but it will not adjust. It will start but blows black smoke. I have tried to adjusted the carb but it stays the same. I have even screwed the main jet all the way in. Adjusting the jets the way the manual says just makes the problem worse. Any thoughts on how to adjust the carb? Does someone have a set of replacement jets? I recently removed the mag and foot starter and installed a distributor, ford solinoid, and keyed starter switch.

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Dave Lemaster

07-26-2005 20:23:03




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 Re: DC carb problems in reply to trains39, 07-23-2005 16:35:24  
I have a 49 DC with a zenith carb. The first time the same thing happened to me, I just got back from being stationed in Kuwait for the Iraq freedom deal. Anyway it wouldn't start for me after sitting idle for a year, I went & tore the carb apart, checked the mag, governor,& put gas in it. It started & ran like yours does. I remembered that the lawn mower was running poorly with the same gas I put in the DC. Changed gas out again & it ran smoothly up to about a month ago. Now it runs smooth at idle but kills when I advance the throttle. A person I met that knows Case's says he thinks it's in the carb that's causing it.

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Glen in TX

07-25-2005 08:29:17




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 Re: DC carb problems in reply to trains39, 07-23-2005 16:35:24  
Need to check your fuel tank and lines for crud plugging things up or it will just plug the new needle and seat again. Was the float ok when you rebuilt the carb? If it leaks fuel in the float will be too heavy to work right. Is it a Marvel Schebler or Zenith carb and what is the number on it?



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trains39

07-25-2005 13:32:07




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 Re: DC carb problems in reply to Glen in TX, 07-25-2005 08:29:17  
It is a Zenith carb believe number is 8964. There is no plate on carb. NO problems with float put a small weight on top and placed in bowl of cleaner overnight, no liquid in float next morning. Cleaned fuel tank and lines, also installed new filter on line.



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Glen in TX

07-25-2005 13:50:07




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 Re: DC carb problems in reply to trains39, 07-25-2005 13:32:07  
Not much new but kits available for that older Zenith carb. Just have to try cleaning jets and passage ways with wire or drills more or find another carb like it for parts or convert to a later style sometime. Might find some parts from old dealers or salvage.



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