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Farmall & IHC Tractors Discussion Forum
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distributor cap bad????

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JMM

11-09-2006 19:46:43




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pulled mag off 47 a and put in a new coil. when i turn it by hand i get spark out of the tower to the center of the cap. i can take the cap off and touch my finger to the inside center and turn mnag and it hurts. if i put the cap back on and put a plu wire in it i cant feel any spark at the end of the wire when spinning the mag by hand. is this a bad cap and rotor or does the plug wire have to touch a grounded spark plug to make the spark jump from rotor to cap? thanks

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El Toro

11-11-2006 12:21:46




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 Re: distributor cap bad???? in reply to JMM, 11-09-2006 19:46:43  
Did you find the problem with your ignition? Hal



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JMMM

11-10-2006 07:38:46




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 Re: distributor cap bad???? in reply to JMM, 11-09-2006 19:46:43  
Thanks for all of the replies. The mag is off the tractor. I put in a brand new coil. when I installed the coil i put my finger on the top bump on the coil. i did this before hooking to condensor. turned mag by hand and it shocked me. put in the new condenser and points set gap at .013 and used ohm meter to see if i had any resistance in wire going from condensor to points and it was fine. never coul see a spark at points when turning mag though? maybe you cant see? also checked two gears and set filed tooth between f and r lines on the black shaft . put it together and it when i turn it by hand it will shock me coming out of tower, when i pull cap off and put my finger on the contact point on the inside of cap it will shock as well. when i put cap and rotor on i cant get a shock on any plug wire. i dont ge a spark when i jump coil wire to ground terminal. it is a strong shock, hard to hold on to. but cant get spark. any ideas? thanks

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RR Mech

11-10-2006 21:10:04




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 Re: distributor cap bad???? in reply to JMMM, 11-10-2006 07:38:46  
The milled tooth has to be lined up with the mark for clockwise rotation,the other mark is for a counterclockwise mag and one tooth off will affect the spark out of the plug wires.Even if you have good spark to the center terminal it will not run right if the rotor is not timed for clockwise rotation.



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MAGMAN

11-10-2006 03:20:31




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 Re: distributor cap bad???? in reply to JMM, 11-09-2006 19:46:43  
IT would not have anything to do with the rotor timing unless the gear is stripped and not turning all that does is time the spark for each tower you will still get spark if its off just out of time. How hot of spark do you have? take the coil wire hold it next to the ground screw on the side of the mag and give her a trip hold it about a 1/4" away and see what you have for spark. Nice Blue? Lazy yellow? If all looks good switch out that cap and rotor and see what happens. MagMan

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MAGMAN

11-10-2006 06:34:59




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 Re: distributor cap bad???? in reply to MAGMAN, 11-10-2006 03:20:31  
lET ME CORRECT THAT. I am kinda confused on how you are trying to get spark at your cap and where you are putting your finger. Most of the time even when the rotor timing is off you will usally feel something at one term or another but if you are testing it on say # 1 and looking for spark where is the rotor pointing toward on the cap? is it # 1 or is it off and toward 3 or something. JON

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gene bender

11-10-2006 02:20:31




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 Re: distributor cap bad???? in reply to JMM, 11-09-2006 19:46:43  
As the other post said is the rotor lined up with the tower when it fires.



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merv

11-09-2006 21:41:20




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 Re: distributor cap bad???? in reply to JMM, 11-09-2006 19:46:43  
I had just about the same problem a few weeks back. Before replacing everything. You may want to test the cap with a continuity tester. I did this and found that two pickups that were bad.
This may be true with yours.
Just a thought. Give it a try. I fixed mine, and it took about 10 minutes, and everything is working great. If this is your problem, I will tell you how I fixed mine. It was a lot cheaper than a new cap.
merv

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RR Mech

11-09-2006 21:14:28




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 Re: distributor cap bad???? in reply to JMM, 11-09-2006 19:46:43  
I would say that the little gears that time the rotor are not in the proper position. Take the little cap off that is held on with two screws that goes around the rotor shaft. Clean these gears up and line up the "C" mark with the tooth that has a little corner milled off. This will line up the rotor with the proper terminal inside the cap. Hope it works.



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old

11-09-2006 21:03:58




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 Re: distributor cap bad???? in reply to JMM, 11-09-2006 19:46:43  
You might have a bad cap but also could be a bad rotor. I would first repalce the rotor, since the caps for a mag are a little on the high side. Also you can check the cap for cracks by spraying starter fluid on the inside of the cap and let it air dry. If theres cracks in it you will be able to see them after the starter fluid has dried. What you will see is lines in the cap if its cracked. For some reason the starter fluid will make the cracks show up.

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El Toro

11-09-2006 20:29:00




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 Re: distributor cap bad???? in reply to JMM, 11-09-2006 19:46:43  
If you have the coil wire going from the coil to the center of the cap you should have fire from your plug wire without connecting it to a sparkplug. I would replace the rotor first. Make sure that rotor is clean. Clean it with some 400 grit wet or dry. Try another plug wire
to see if that's the problem. Hal



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Pete7

11-09-2006 20:25:40




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 Re: distributor cap bad???? in reply to JMM, 11-09-2006 19:46:43  
Hi...I once had a distributer cap on a Super A that was bad and it was doing pretty much what you described. Turned out that the center contact point of the cap (it's spring loaded) was stuck so that it was not making contact with the rotor. On your grounding question....yes, electric needs a path to ground, but if you felt a shock on the cap's center contact and you were in the same spot/same shoes etc when you touched the plug wire you should have felt a shock (assuming the wire is OK).
Pete

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