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Farmall & IHC Tractors Discussion Forum
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Farmall H carb idle stop screw and idle adjustment

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John in Ct

09-28-2005 16:03:35




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I am rebuilding a carb for my H (see previous post) and at the same time I have one on my H. I am having trouble adjusting the low idle stop screw and low idle adjusting screw. I try to get it to idle to 450 rpm and only can get it to about 700 rpm. I have the idle adjusting screw about 1 turn out. I find that as I back the idle stop screw out to turn the rpms down, I have to turn (richen) the idle adjusting screw in. I am afraid that to get it to idle near 450 I will have to have the idle adjusting screw all of the way in. It has a high speed idle of 1840-1850 rpms. Also, I rebuilt the carb with everything except a new throttle shaft bushing. I can shake the shaft very little but I am sure it has more than the .001" play but it isn't real sloppy. I will rebush it along with my other carb. Thanks!!

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RustyFarmall

09-28-2005 18:42:41




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 Re: Farmall H carb idle stop screw and idle adjust in reply to John in Ct, 09-28-2005 16:03:35  
What you are describing on your running H is completely normal. Before you try adjusting any further make sure the engine is fully warmed up.



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GordoSD

09-28-2005 18:18:49




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 Re: Farmall H carb idle stop screw and idle adjust in reply to John in Ct, 09-28-2005 16:03:35  
With the carb on the bench look at the throttle stop screw where it contacts the cam on the end of the shaft. Adjust that so that it is barely touching the cam. Then turn it all the way in counting turns. Then all the way back to the "just touching " point. That is youer minimum setting. Going further out than this is useless. I wouldn't worry about a little play in the shaft. If you wiggle the shaft and watch the butterfly you will see that nothing really happens there. we're not talking 7000 rpm, 400 hp v8 firebteathers here.

gw

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