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Farmall & IHC Tractors Discussion Forum
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Super M Carb

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Tom O

06-19-2006 08:08:10




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I would like to thank all that assisted me in my carb trouble on my Super M. Does anyone know where I can get parts online or do I need to buy a replacement? The rebuild kits at Tractor supply is limited to just gaskets and float needle and seat. There is a restriction in the carb that is driving me crazy. I have taken it apart and tried to soak it in cleaning solution, blown it out with my compessor at every hole in the thing, screened the fuel, and after a while it shuts down with a restriction. I am getting laughed at around here. No one in my area has any experience with my old work horse. It has become a real challenge I can not give up on. Thank you for your help.

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newpuller

06-19-2006 15:37:20




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 Re: Super M Carb in reply to Tom O, 06-19-2006 08:08:10  
I just rebuilt the carb on my M and I found some clogged ports that went inside the venturi. I found them accidentally becasue I took my venturi out and saw that it had junk in it. My tractor hasn't ran yet, it's close to being complete now. If there is a clog in there you might not find it right away. These ports feed a tiny port that sprays gas into the up draft tube in the throttle body above the venturi. It might be worth a look.

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Sean in Calgary

06-19-2006 11:46:42




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 Re: Super M Carb in reply to Tom O, 06-19-2006 08:08:10  
Reading this thread, I just had a thought. Although it certainly sounds like an ignition related problem, there might be one other fuel related problem. 1/2 an hour is an AWFUL long time to get to a fuel flow problem, but how long does it take to draw a vacuum in the fuel tank if the vent is plugged? Wtih a gravity fed system like these have, you aren"t getting fuel against a vacuum. Next time it starts to starve, pop the lid off the gas tank and see if it makes a difference. I might be completely off base, but it is certainly a low cost and easily executed troubleshooting step.

If that makes no difference, then I defer to all of the rest of the experience in the forum.

Sean

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Bob M

06-19-2006 08:38:24




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 Re: Super M Carb in reply to Tom O, 06-19-2006 08:08:10  
Before you do anything else try removing the plug at the bottom of the carb bowl, then letting the gas drain into a suitable container for a minute or two. You should get a continunous, solid stream of fuel and accumulate something on the order of 2 or 3 quarts a minute.

However if after the initial surge as the bowl empties the gas just dribbles out, the problem is a restriction in the fuel supply. Look for a clogged carb inlet screen or sediment bulb, pinched fuel line, a piece of junk in the tank laying over the outlet opening, etc.

However if you have good fuel flow out of the bowl drain you'll need to go back inside the carb and clean out whatever is clogging the main fuel circuit. Recommend poking a SOFT copper wire thru all the passages, orifices, etc. then blowing it out with air. Pay particular attention to the orifice and connecting passages at the bottom of the bowl behind the high speed adjustment screw !

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the tractor vet

06-19-2006 08:25:36




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 Re: Super M Carb in reply to Tom O, 06-19-2006 08:08:10  
Are you soaking it in a real carb cleaner or just a parts cleaner? Myself i like using a tourch tip cleaning wires to get down in the small passages and if nessary then tip cleaning dril bits with a pin vice . Now are you sure that your problem is not crud in the fuel tank ? Have you drained the tank and removed the sediment bowl and taken a blowgun with a homemade long extenshion and got downin there and blowen it out and checked the inlet for crud?? Do you have the float set correctly and the main load screw set at 4 1/2 turns off the seat . Myself i use Barryman's carb cleaner to soak a carb in and it works real well if it is warmer like in the 90-120 degree ranges . I warm it up by heating wate to boiling and place the can in the hot water and let it soak for a couple hours then into a boiling bucket of water and Mr. clean for a hour or so the a hot and cold rinse the blow dry .

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Tom Ogden

06-19-2006 08:38:50




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 Re: Super M Carb in reply to the tractor vet, 06-19-2006 08:25:36  
I took the carb to an auto carb shop and they supposedly did most of the above. They told me it was a very simple carb and should be fine. I tried a seperate fuel supply that was double strained but after about 1/2 hour of use it starved out. I took it apart again and away we went for another 1/2 hour or so and then down again. It runs great while it is running.



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Bob M

06-19-2006 08:57:44




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 Re: Super M Carb - I agree! in reply to Tom Ogden, 06-19-2006 08:38:50  
I agree with tractor vet. Sounds like your carb is fine - the problem rather is the ignition.

Either swap the coil, or run the tractor until it quits then immediately pull a plug wire and crank the engine and check for spark.



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the tractor vet

06-19-2006 08:45:20




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 Re: Super M Carb in reply to Tom Ogden, 06-19-2006 08:38:50  
Now this is sounding more like a coil getting hot or in plain words ya got a bad coil replace and call me in the morning.



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Tom O

06-19-2006 09:02:39




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 Re: Super M Carb in reply to the tractor vet, 06-19-2006 08:45:20  
I already did that with a new one that does not require a ballast resistor. I have gone through the distributer with new points, condenser, rotor, distributor cap, wires, and new plugs. I just seems to be starving for gas after about 1/2 hour of use.



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Bob M

06-19-2006 09:46:55




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 Re: Super M Carb - I agree again! in reply to Tom O, 06-19-2006 09:02:39  
Once again I gotta agree with the tractor vet! Your statement "it just seems to be starving for gas after about 1/2 hour of use" is a classic symptom of a temperature sensitive coil failing after it heats up.

Another quick test: Next time you run the tractor, when it begins "starving" for gas try working the choke. If you find a choke position where the engine runs better you've got a fuel starvation problem. However if it runs the same (or worse...) with the choke partially pulled it says the problem is ignition.

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Tom O

06-19-2006 10:05:25




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 Re: Super M Carb - I agree again! in reply to Bob M, 06-19-2006 09:46:55  
It does keep running (poorly) by adding choke and that is what keeps me going back to the fuel supply problem. The coil is one I got from VT for that tractor with a 12V upgrade. I think I will start over again and trace all my steps to see if I did not miss something really easy.



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the tractor vet

06-19-2006 09:17:00




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 Re: Super M Carb in reply to Tom O, 06-19-2006 09:02:39  
If you have changed that tractor over to 12 volt or it was change over by someone else and went to and auto parts store i have run into this several times . Install the propper 6 VOLT coil with a resistor and amke sure what polarty your battery is and hook the coil up the correct way . Now it is like this if ya have good fuel flow and ya have good spark it will run these are plane and simple engines . So here is what to do take it out and run it like BOB said when it quiets first check to see if the coil is hot and if ya got spark then pull the bottom plug out of the carb and see if it poors fuel out not just a trickel . But myself i still think it is and Ing. problem .

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RustyFarmall

06-19-2006 08:16:50




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 Re: Super M Carb in reply to Tom O, 06-19-2006 08:08:10  
Are you sure the carb is causing the problem? If the engine starts, and runs for several minutes, and then shuts down, I would say your problem is somewhere else. Just for the fun of it, completely remove the cap from the gas tank and then start the tractor. If that doesn't do the trick, you may have a restriction in the sediment bowl or fuel line. Send me an e-mail if you want, I'll see if maybe we can figure this thing out.

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