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Farmall & IHC Tractors Discussion Forum
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still no fire!!

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jeffnofirefarmall

10-10-2005 17:29:51




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I have a farmall model A with a fairbank morse magnito ingnition. Im not getting any fire and I have replaced my points and condinser. My coil is ohm at 11.46 with my dvm set to 20m. I don't have any idea how to check my magnito. Im not even sure where my mag is. inside the houseing for my points and coil is 2 shafts, one come from engine and the other turns rotor. I think the shaft that comes from engine has the mag made in it but there is no wires. Can someone please tell me how to check this system. Thanks for any help you can give me on this.

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Wayne Swenson

10-11-2005 07:39:22




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 Re: still no fire!! in reply to jeffnofirefarmall, 10-10-2005 17:29:51  
Be sure the points & condensor connections inside the mag have not "accidently" moved & are touching the metal housing thereby grounding the circuit. Take a 1/4" wide by 2" long strip of 600 grit Wet or Dry abrasive, double it over abrasive side out & insert between the points. Let the spring close the points and gently pull the abrasive out. Repeat a couple times. Clean the points with some carb cleaner or brake cleaner & blow dry with compressed air. Take a resistance tester(ohmmeter) & test resistance with the points closed. Should read zero; if not re-clean & re-test.

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jeffnofirefarmall

10-11-2005 04:17:14




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 Re: still no fire!! in reply to jeffnofirefarmall, 10-10-2005 17:29:51  
Thanks guys for all your help! Everyone on here is pacient with all of us that don't know anything except that we like these old tractors.



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Bob M

10-11-2005 06:14:20




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 Re: still no fire!! in reply to jeffnofirefarmall, 10-11-2005 04:17:14  
Resistance for a mag coil secondary should be somewhere in the 1,000 to 2,500 ohms range or so.

Your DVM reading of 11+ megohms says the coil secondary is open circuited. (I'm presuming you're measuring resistance between the coil output and the mag frame/ground here...)

So before tearing into the rotor/magnet assembly in the guts of the mag I'd first replace that coil!



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El Toro

10-11-2005 05:09:49




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 Re: still no fire!! in reply to jeffnofirefarmall, 10-11-2005 04:17:14  
Here's a website that rebuild mags. Hal


http://www.magnetoparts.com/mag_docs.htm



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El Toro

10-11-2005 03:55:06




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 Re: still no fire!! in reply to jeffnofirefarmall, 10-10-2005 17:29:51  
You keep asking where the mag is, that is the mag
where you installed those points and condenser.
The coil is inside that mag too. That may your
problem. The Magman would be the one to checkout
your mag. The magnets inside your mag may have lost their magnetism and these are what creates
your spark. You may have an auto or tractor shop
that repairs magnetos in your area. They would have the equipment to troubleshoot your mag.

If you ever decide to pull that mag, you need to
see where the rotor is pointing. This is very important so you it's easier for you reinstall
the mag later. When you see where the rotor is pointing you need to write it down. When your mag is returned to you, you need to set the rotor in the same position so it's in time. Hal

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Janicholson

10-10-2005 18:45:06




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 Re: still no fire!! in reply to jeffnofirefarmall, 10-10-2005 17:29:51  
11,000,000 ohms is realy an open circuit. I'm not sure what was being measured, but when the meter is set to Meg ohms, it is measuring extremely large resistances. Kind of like measuring the resistance of a plastic spoon.
Others will surely assist in analysis. Magman on this site rebuilds mags professionally (as well as sharing in our common passion).
JimN



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