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Farmall & IHC Tractors Discussion Forum
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crb rebuild uneven throttle

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curt muller

07-31-2004 10:29:28




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I have just rebuilt my carb. on my '43 H,IT idles fine but under increased throttle it wants to rev up and down (I have checked the gov's parts and they are movingf freely- but i don't know how the tension is supposed to be?)it ran fine prior to the rebuild, but was leaking from the gaskets. I have set to the pre-set levels for the needle and idle stop. ant help woud be appretiated!! thank's in advance curt

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lee

07-31-2004 13:50:53




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 Re: crb rebuild uneven throttle in reply to curt muller, 07-31-2004 10:29:28  
Determine if the hunting or surging is caused by the carb or gov by holding the throttle linkage at the carburetor steady. If it is surging or hunting with the throttle plate steady the problem is probably in the carb. Carb presets I typically use are 1 to 1.5 turns off seat for both idle (air screw) adjustment and high speed needle. Note the low speed idle needle is an air screw so it richens the mix when you turn it in toward the seat. The high speed adjustment controls fuel in the high speed circuit so turning it out will richen the high speed mix.
If you determine the problem is not in the gov the problem could be sluggisjh fuel delivery from the tank, float level incorrect, flooding caused by leaky float (fuel inlet) needle, too lean or rich at the high speed needle. An air leak at the carb gasket or manifold. If you determine the problem is not in the gov, ie it surges with throttle plate steady you should warm it up good and set the low speed needle for best running at low speed. Then set hand throttle lever for high speed operation and adjust the high speed needle for best running. If it won't smooth out and run steady you've got to look at the other possible problems mentioned above.

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