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Harry Ferguson Tractors Discussion Forum
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idle air screw

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Don M

09-03-2004 02:13:27




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I cleaned and rebuilt my carb.(TO-30)engine runs fine except for one thing...
I can close the idle mixture screw completly and the engine runs perfect. Usually an engine will shut down if you cut off the air. I looked for manifold gasket leak but found none.. What else could be causing this.Apparently I have a massive leak somewhere..But where ??
Thanks
Don




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Fred OH

09-03-2004 09:40:55




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 Re: idle air screw in reply to Don M, 09-03-2004 02:13:27  
Try the shaft going thru the carburator...it can suck air in there. I always wanted to try one of those cases by epoxying snug fitting o-rings on each side of it to seal air leak. Last, I guess it could come from the brass butterfly inside of the carb or the venturi area around it...not an easy fix in my opinion...maybe time for a new one. Fred OH



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Don from Co.

09-28-2004 04:53:46




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 Re: idle air screw in reply to Fred OH, 09-03-2004 09:40:55  
Thanks Fred,
I bought a new carb. (not rebuilt but new)and I'm having the same problem. I can turn the idle mix screw all the way closed and the engine runs fine.Matter of fact the screw has no effect on the engine performance at all, fully open or closed. Again intake manifold gasket seems ok. And no cracks in manifold. I'am depressed !!



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