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Farmall A Zenith Carb questions

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Chad from Michi

03-07-2007 06:24:28




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Ok I have a 1946 A with the Zenith Carb. I see on one web site there is 2 different zenith Carbs.
My carb #'s are 52499, 9752, DB
Well I got the bowl gasget from the dealer and cleaned the carb real good. Now I got the tractor to run but it is slow and spits and sputter some when I advance the throtal. I am guessing it isn't getting enough gas. I Know I need to check the sediment bowl screen. The inlet screen in the carb is nice and clean.
Ok there is a adjustment screw in the top of the carb that faces the front of the tractor. I can screw that in or out and it doesn't make one bit of difference in the engine. Do I have plugged passage way? what does this screw do?
Also does anyone have a info sheet on settings for this carb? Float levels and such?
Thanks for the help.
Chad

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CNKS

03-07-2007 19:13:37




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 Re: Farmall A Zenith Carb questions in reply to Chad from Michigan, 03-07-2007 06:24:28  
The screw is for the idle, the main jet is fixed unless you happen to have a kerosene/distillate carb. The float setting is 1 5/32 not 1 5/16, according to the A service manual. The measurement is with the top of the carb upside down, measured from the gasket to the top (with it upside down) of the float. As El Toro said, that carb will usually run rich unless you work the tractor hard, you might need to lower the setting, but that won't affect performance, unless it is way off. You really should replace the needle and seat. But, if you are SURE your carb is clean, then you have a piece of rust of something restricting the flow, most likely in the outlet of the gas tank before it gets to the sediment bowl.

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CNKS

03-07-2007 19:18:06




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 Re: Farmall A Zenith Carb questions in reply to CNKS, 03-07-2007 19:13:37  
El Toro said your float could be too low, I agree, but I bet it is contamination -- he didn't mention that it would run rich at the recommended setting (it probably will though). I misread what he said, my apologies to both of you.



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DDG

03-07-2007 15:13:29




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 Re: Farmall A Zenith Carb questions in reply to Chad from Michigan, 03-07-2007 06:24:28  
Make sure the intake tube from the air cleaner is open. Mud dobberrs built a nest in mine, and it was so plugged up it would only idle, but could not get enough air to go any faster. Real hard to find, because you can"t see inside, plus you don"t normally think to look there.



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Chad from Michigan

03-07-2007 07:05:12




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 Re: Farmall A Zenith Carb questions in reply to Chad from Michigan, 03-07-2007 06:24:28  
I didn't buy a replacement kit. The only bad thing most of the time is the gasket. I took and soaked the carb it looks new. Took out each jet made sure it was clean completly tore it down and used compressed air to blow it out.
I need to replace the needle and seat it wont stop the gas. Even with the sediment bulb off it leaks as well so I have a coffee can under the carb right now.
I get no difference in engine performance adjusting that screw and it seems like you would see something or hear the engine? am I worng on that?
On my cub Carb float I have settings for both directions on the float amount of drop and the closed postion.
Chad

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RustyFarmall

03-07-2007 07:35:27




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 Re: Farmall A Zenith Carb questions in reply to Chad from Michigan, 03-07-2007 07:05:12  
If turning the adjustment screw makes no difference, then either the carb is still dirty,or you have a vaccuum leak. Did you use a new gasket between the carb and the manifold? A carburetor is much more complex that most folks realize, and a carb that is 60+ years old will require more work than just a bowl gasket and new needle valve.



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Chad from Michigan

03-07-2007 08:08:35




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 Re: Farmall A Zenith Carb questions in reply to RustyFarmall, 03-07-2007 07:35:27  
Well I hate it when I get told it needs more work. Apparently I missed something. I have done carbs before and every once in a while something happens and they don't run just right. I took my time and gave this thing TLC. If something was bad I would have replaced it. Don't assume I don't know what I am doing. That really iratates me rusty. I know there delicate little things. I checked it out good all the jets and stuff and choke valve, throtal plate all were good and tight. Good gasket between the carb and the manifold.

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City-Boy McCoy

03-07-2007 14:33:50




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 Re: Farmall A Zenith Carb questions in reply to Chad from Michigan, 03-07-2007 08:08:35  
Calm down, champ. The man is patiently and attentively trying to help you. He does not know your knowledge or background. Take it easy, man. mike



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scotty

03-07-2007 10:50:11




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 Re: Farmall A Zenith Carb questions in reply to Chad from Michigan, 03-07-2007 08:08:35  
Chad, Just curious, did you pull the main jet out of the carb and clean ? Blow compressed air through the rest of the passageways ? I have had that main jet get varnished up on me before !


scotty



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Chad from Michigan

03-07-2007 12:17:32




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 Re: Farmall A Zenith Carb questions in reply to scotty, 03-07-2007 10:50:11  
Scotty yes I pulled all the screw in jets (or what ever they are) out tore every thing that unscrewed out of it.



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RustyFarmall

03-07-2007 08:34:44




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 Re: Farmall A Zenith Carb questions in reply to Chad from Michigan, 03-07-2007 08:08:35  
I didn't mean to offend you. I was merely passing on knowledge that I have gained by rebuilding those old carbs. I also learned the hard way that any shortcuts you take will come back and bite you.



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Chad from Michigan

03-07-2007 09:22:32




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 Re: Farmall A Zenith Carb questions in reply to RustyFarmall, 03-07-2007 08:34:44  
Well I didn't really think it was a short cut. Kind of like if your engine in your car needs a head gasket your not going to rebuild the entire engine just to fix a bad head gasket.

The carb was rebuilt at the dealership when the tractor was rebuilt about 7-9 years ago and then it sat for 5-7 years untill I bought it. Main problem was varnich in the carb. I must not have got a passage way clean. Everythinkg looked good. so I fixed the gasket which broke when I pulled it apart.
chock shafts and seals are good, same as the throtal. All the jets were clean I could see through them. pulled all apart soaked and air pressured out. I will do it again. I had the same problem on my Cubs carb in the idle circut I fianly got it but I don't remember what it was.
I will also pull it apart and check the new IH gasket some times they cover up parts of the passage ways and need to be trimmed. I forgot to check that.

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vitarus

03-10-2007 20:51:18




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 Re: Farmall A Zenith Carb questions in reply to Chad from Michigan, 03-07-2007 09:22:32  
You are on right track. You have done everything correct yet some outside gasket may mess you. Some little edge may be rubbing the float and keeping it from admitting or cutting off fuel flow and it could be simple as that. Also consider exhaust restriction.



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RustyFarmall

03-07-2007 09:30:33




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 Re: Farmall A Zenith Carb questions in reply to Chad from Michigan, 03-07-2007 09:22:32  
If you have one of those torch tip cleaning sets, the one with different sizes of wire, use that to clean out those passages.



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Chad from Michigan

03-07-2007 09:41:00




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 Re: Farmall A Zenith Carb questions in reply to RustyFarmall, 03-07-2007 09:30:33  
I don't have the kit but I think I can get it from work.
thanks rusty.
chad



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El Toro

03-07-2007 06:54:29




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 Re: Farmall A Zenith Carb questions in reply to Chad from Michigan, 03-07-2007 06:24:28  
My manual has your carburetor listed, but it doesn't give the float setting. That screw that you are adjusting is for idle only. Turn CW to enrich and CCW to lean. Wasn't there a float gauge with the kit? It has the the 1-1/4 Updraft listed, but it's not shown or which tractor it was used on. The float setting for that is 1-5/16". Make sure your intake manifold is tight and the carburetor is snug, don't over tighten.

Your float level is probably too low. These carburetors don't have the main jet adjusting screw that's used on the H Farmalls and up used to enrich the carburetors. If you have an inline
fuel filter I would remove it since a lot of those are not for gravity fed engines. Hal

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