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Farmall & IHC Tractors Discussion Forum
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this odd old 40 A

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tn terry t

12-29-2007 11:27:55




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this is kinda odd to me but i have this old A that did not come with a starter with messed up shoulders i could manage to crank start the old thing pretty good any way we put a ring gear and starter on it you can crank the living daylites out of it wont start just floods the heck out of it now heres the kicker you can hand crank it it will fire right up i have sence learned if you just barley "bump" the starter it will start could it be that theres something to the way i have the points set in my mag? what you guys think?

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RichH

12-30-2007 15:35:59




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 Re: this odd old 40 A in reply to tn terry t, 12-29-2007 11:27:55  
In my training as a mechanic back in the 70's, this is how I was told a mag works. First the mag creates its own power to create the spark at the plugs, it has no connection to the battery. When you stop a tractor with a mag you ground out that power and the spark is not created and the tractor stops. The impulse is what creates that power. At a very slow rpm like cranking at the proper time the impulse drive snaps and spins the mags armature a few degrees very quickly to create the electrical power that goes to the coil in the mag and when the properly adjusted points open up it creates the power to make a spark at the spark plug. Most old tractors the mag had adjustable timimg so that when you were cranking and the mag snaped it was when the piston was past top dead center and the engine wouldn't backfire and maybe break your arm or other things, then when the tractor was running the timing was changed back to the preset advance for more power. When the tractor is running the armature is spinning fast enough to create the spark without the impulse snapping. So spinning the engine faster at starting should not be causing the problem, except that if the engine is easily flooded it will flood that much easier. Try starting it first with no choke and after a few seconds if it doesn't start then choke it just a very little and if it still floods you might have other problems like too high gas level in the carb. I have a tractor that I can't pull the choke until it starts and then I have to pull the choke some to keep it running unless it's really cold then I might have to choke it just a little to get it started. I hope this helps. RichH

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Wayne1

12-29-2007 17:36:07




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 Re: this odd old 40 A in reply to tn terry t, 12-29-2007 11:27:55  
You didnot say what the starter you put on was of or for. crank engine with starter checking rotation of fan ??? wayne



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tn terry t

12-29-2007 14:37:43




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 Re: this odd old 40 A in reply to tn terry t, 12-29-2007 11:27:55  
thanks guys it makes sence brand new starter brand new battery it does wup the tar out of it might just have to go back to the 6v. heck i dont even have a 6v. charger any more



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Mike Farmer

12-29-2007 13:28:42




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 Re: this odd old 40 A in reply to tn terry t, 12-29-2007 11:27:55  
I agree that it is probably turning too fast for the impulse coupling to engage properly and that fully advances your ignition. Next time you go to start it with the starter, leave the gas off and listen, you should be able to hear the impulse "click". If there is no click then thats the fault. There has to be a dozen reasons for it so I'm not even going to go into that area. MTF



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Nosey

12-29-2007 12:33:48




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 Re: this odd old 40 A in reply to tn terry t, 12-29-2007 11:27:55  
We had a B with a mag and with the starter on 12V it wouldn't start until you let off the starter. It was spinning it to fast for the impulse to do its job. Went back to 6V and never had another problem



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CNKS

12-29-2007 12:29:13




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 Re: this odd old 40 A in reply to tn terry t, 12-29-2007 11:27:55  
It happens, my dad had an H that did that. I have read that the coupling can spin too fast as Karl said. But, I think flooding has a lot to do with it. My Super H will flood much easier than my Super A or C, though--different carbs. All mine have distributers. It doesn't take many revs to flood with a starter, harder to flood one with a crank.



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Karl Hamson

12-29-2007 12:17:58




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 Re: this odd old 40 A in reply to tn terry t, 12-29-2007 11:27:55  
Could it be that you are spinning it too fast with the starter for the mag impulse coupling to work properly? Are you using a 12 volt battery with a 6 volt starter? Both my Super A and C will flood if you have the choke full out for much more than two compressions.



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steveormary

12-29-2007 12:31:08




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 Re: this odd old 40 A in reply to Karl Hamson, 12-29-2007 12:17:58  
Dont use the choke when trying to start engine. Use choke to keep it running after it starts. Just bump engine over with starter. It may b that the starter draws down the battery enuf so that you dont get a good sparrk.

steveormary



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El Toro

12-29-2007 14:15:24




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 Re: this odd old 40 A in reply to steveormary, 12-29-2007 12:31:08  
It has a mag and doesn't use battery voltage. Hal



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