Re: Farmall Super A - Quits while idling.

Posted by Hobo,NC on November 13, 2005 at 18:12:39 from (151.213.115.231):

In Reply to: Farmall Super A - Quits while idling. posted by Brian2 on November 13, 2005 at 14:35:13:

it runs on after it is shut off for a few moments you have a idle circut problem or a vacuum leak. This happens cuzz the throttle plate izz open enoufh to still draw fuel in and cuzz the cylinders are hot enoufh its still able to ignite the mixture, or you have idle'ed it up enough to compensate fer utter problems so it will idle. Enny time it diesels , runs on, after shut down the throttle plate izz open or you have a vacuum leak Its idle’in to high, you have a idle circuit problem iffin you have to idle it up to keep it were it will idle. Lots kin be wrong. I like to git the idle circuit to were I kin make it to rich and the lean it out. Not sure iffin this will help but this izz how I werk out the Ford Marvel Schebler carb idle circuit
I have a fix fer the lean pop corn pop‘in TSX-241 and would think the TSX-33 would also fall under this also. First you need to know that the idle circuit has a big affect on the run‘in of the engine till about ½ throttle and then the main metering system takes over. The idle circuit will affect the performance of this type of carb that has no accelerator pump so iffin the idle circuit izz to lean it will hesitate, stumble or may lay down flat on its face when you throttle it up, you also may encounter a surge in engine RPM at a given throttle set’in below ½ throttle. .A lean miss at idle that will sound like Pop corn pop’in in the exhaust, it may need to be choked during a start up on a hot engine. A rich mixture will have a pup-pup-pup-pup constant exhaust noise that izz rhythmic and the engine sounds like its laboring at idle were as a lean mixture will have a pop corn type pop with no pattern. I use propane to check idle mixture and have a calibrated meter to control flow a shad tree method would be to apply the choke and if it made the idle worst you have it adjusted proper or may be a little on the rich side if you have a pour laboring pup-pup-pup idle in rhythm with out the choke. If you find that applying the choke the idle picks up and the pop corn sound disappears or ‘bout goes away then you have a idle circuit problem. If running the idle mixture screw in does not clear this up you will need to remove the carb and clean the idle circuit up. Don’t git fooled like I have and think just cuzz I kin git carb spray to flow thru the idle circuit its good to go. The idle circuit has a idle jet that izz .021 so you will need a clean idle passage that izz bigger than .021. I use a welder clean’in tip cleaner and the smallest clean’in wire izz .018 the next izz .022 and the next size izz .025. Remove the idle jet and from the manifold side of the throttle plate werk the .018 wire in the hole till you kin git it to come out the hole the jet screws in. the welders tip cleaner has a enlarged middle section that’s roufh and will enlarge the port sum. Werk you way up to the .025 wire to insure that the idle port izz clean. The idle port izz crossed bored so its not a straight shot. That’s the problem I found on the reproduction 241 izz they did not completely drill the hole threw the manifold side of the base and the circuit wuz smaller than the idle jet and that’s why it did not make much difference when I removed the idle jet the port wuz already restricted Even throw it would flow carb spray the port wuz to small. I don’t recommend this but I drilled the port out with a pin vice and yes I broke a bit in it when I hit the last little bit of slag. Took sum werk but I got it out. A nutter good way to check yer idle circuit izz to remove the idle jet and if you still have to run the idle screw in all the way to git it to idle descent the you know you have a restriction in yer idle circuit. Teknicaly when you open the idle mixture screw, it inhibit's the ability of the idle circuit to draw fuel from the float bowl. what happens izz you open a air bleed that lowers the vacuum to the idle circuit. When you run the idle screw all the way in (don’t jam the screw tight its brass and you damage the tip stop when you feel it bottom out) you enable the idle circuit to draw as much fuel as the idle jet will allow. If you find that yer engine runs best with the idle screw all the way in and turn’in the screw out just a little either stalls the engine or has a unstable idle I would clean my idle ports then when I new they were clean I would play sum with drilling the idle jet till I found I had sum adjustment with the idle screw and I could make the mixture rich or lean. Believe me .040 izz to big new jets are only a couple bucks so not much to loose to git yer N carb fine tuned. The Marvel Schebler carb izz different form utter carbs Idle mixture turned in to rich’in the fuel mixture and out to lean it out. A good start’in point izz 1 turn out fer the idle mixture and 1 ½ turns out fer the main needle adjustment. Hope this helps at least git ya to think'in bout how the idle system werks.

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• Re: Farmall Super A - Quits while idling. brian2 07:20:31 11/18/05 (0)

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