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Farmall & IHC Tractors Discussion Forum
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M needs you help

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jonnny2006

06-20-2007 18:03:18




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I have a 1951 M. It still requires half choke..... i rebuilt the carb with the tisco kit. I cleaned the carb with carb cleaner and made shure all the worm holes were clean. plus i cleaned the main metering jet and put in new gasket between the carb and the manifold. New gasket between the 2 pices of the carb. I also made sure the float was at proper level. But when i was finsihed with the kit i had a left over o-ring. I din't see where it goes? it was the bigest o-ring in the kit. Also i had tryed the propain thing and found no leaks. so i tried carb cleaner and it was leaking around the choke but that is where it gets fresh air anyways i dont see how that could make it run like its starving. Bottom line I tryed everything that i can thinkk of..... Ahes a real nice tractor as she has good quiet gears and clutch is strong. So i wouls like to get it running correctly. Also what is the little bump on the very bottom of the carb, it looks like it is part of the cast ans has a little indent in it like its a allen wrench it feels like the is vaccum comming from there, plus it leaks gas out of there if you choke it to much. Well any ideas???? shes timed perfect the govner is good shes getting spark on all 4 cylinders. she runs with the choke on. It acts like when you forget to turn the gas on and it runs out. Could there be a crack in the carb somwhere. i wish i had another M to swap the carb and see if it is better. Any ideas??? Plus i cleaned the water seperator and pulled the drain plug at the base of the carb and it has a pencile size non stop stream. Its getting good flow from the tank and there is nothing clogging the tube that feeds the glass jar. I'm ready to try somthing diffrent.

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RustyFarmall

06-21-2007 05:47:11




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 Re: M needs you help in reply to jonnny2006, 06-20-2007 18:03:18  
There are NO o-rings in the kit. They are called gaskets. The largest one in the kit is for the fuel inlet fitting. Did you not remove it and clean the screen that is attached?



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jonnny2006

06-21-2007 07:12:35




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 Re: M needs you help in reply to RustyFarmall, 06-21-2007 05:47:11  
i dint remove the big inlet fitting because there is no screen anymore,,,,, they used a inline filter instead, ya i know there not o-rings but you get the idea.



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RustyFarmall

06-21-2007 12:38:26




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 Re: M needs you help in reply to jonnny2006, 06-21-2007 07:12:35  
That in-line filter has to be of the correct type. Make double sure it is for a gravity fed fuel system and not for a system that uses a fuel pump. The wrong type of in-line filter will cause the exact symptoms you are having trouble with. I would recommend trashing the in-line filter and get a new fuel inlet fitting WITH the screen.



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T poor

06-21-2007 04:17:06




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 Re: M needs you help in reply to jonnny2006, 06-20-2007 18:03:18  
I had a simular problem a few years ago. What I ended up finding is in the top half of the carb their is a peice of alumiunm. That you can pull out. I know you said that you cleaned all the ports but recheck those if necessary run a peice of wire though them. I found that the smalles port was plugged and that prevented the carb not to have enough drag to pull the fuel up without the choke on. Hope this helps.

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jonnny2006

06-22-2007 20:41:55




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 Re: M needs you help in reply to T poor, 06-21-2007 04:17:06  
You were right..... it was in the top piece of the carb,..... on of the holes was compleatly plugged.



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r4etired

06-21-2007 03:42:30




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 Re: M needs you help in reply to jonnny2006, 06-20-2007 18:03:18  
Take a compression test on the engine maybe the problem is not in the carb,might be the valves



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K.B.-826

06-20-2007 20:44:32




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 Re: M needs you help in reply to jonnny2006, 06-20-2007 18:03:18  
Strong flow of fuel to the carb?



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Bob Kerr

06-20-2007 20:18:58




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 Re: M needs you help in reply to jonnny2006, 06-20-2007 18:03:18  
Sounds like you have covered about everything on the carb, but I just had something pop into my head, has the carb been off for any long period of time? Belive it or not I have seen an intake that had a mud dauber build a nest inside and caused rough running. The gas mixture puddled up behind the nest and caused a lean condition. the liquid gas then got sucked through the engine without burning totally. That deal was wacky and it drove the poor guy nuts until he found it!Ran sweet afer he cleaned it out. Just a thought.

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jeramy

06-20-2007 19:32:47




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 Re: M needs you help in reply to jonnny2006, 06-20-2007 18:03:18  
make sure the gaskets on the manifold are all good sounds like it is sucking air from a gasket



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Janicholson

06-20-2007 18:16:09




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 Re: M needs you help in reply to jonnny2006, 06-20-2007 18:03:18  
Sorry, I ment Johnnny



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Janicholson

06-20-2007 18:14:03




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 Re: M needs you help in reply to jonnny2006, 06-20-2007 18:03:18  
Owen, Did you adjust the mixture. The screw at the bottom front of the carb is load mixture it usually is 3 turns out or so from light seating. Oit is richer, in is leaner. The Idle mixture is up higher and is in for richer, out for leaner. If it still runs poorly, I think the main jet is partially clogged. The load screw is not the primary high speed adjustment, that is the main jet (internal), the load screw can have the effect you describe if it is most of the way in. JimN

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Owen Aaland

06-20-2007 18:08:30




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 Re: M needs you help in reply to jonnny2006, 06-20-2007 18:03:18  
If all else is like it should be, check to make sure the venturi is not installed upside down. It is the aluminum piece in the middle. When properly installed the narrowest inside diameter should be even with the top of the main fuel jet. If it is installed upside down the engine will not run without some choke being applied.



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