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Farmall & IHC Tractors Discussion Forum
:

H4 magneto condensor to short to reach grounding screw

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slydog

02-04-2018 13:28:47




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I bought a points and condensor for an H4 magneto and the condensor is shorter than my old one and won't reach the grounding screw. What do I do now?
Also is there a way to test my old condensor? Maybe it is ok and I can just use that and my problem will be solved.




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Bob

02-04-2018 15:07:53




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 Re: H4 magneto condensor to short to reach grounding screw in reply to slydog, 02-04-2018 13:28:47  
Quoting Removed, click Modern View to see

A "thermally-intermittant" coil certain can cause the issue you are having.

Just a warning, if you decide to replace the coil, don't get rough with the coil, trying to get it out of the old coil core. While the core LOOKS solid, it's actually laminated and easily damaged. Better to carefully cut the old coil off than to destroy the core.

Post back if you have questions, I have photos of a coil core that didn't survive, photobucket is holding them hostage, but I can find them on my 'puter and re-upload.

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slydog

02-05-2018 10:29:17




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 Re: H4 magneto condensor to short to reach grounding screw in reply to Bob, 02-04-2018 15:07:53  
How do you suggest I get the coil center out? Can I tap on it with a hammer and see if it will slide out? You say they are laminated? I have never had one out so not sure what it looks like.



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Bob

02-05-2018 10:59:27




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 Re: H4 magneto condensor to short to reach grounding screw in reply to slydog, 02-05-2018 10:29:17  
As I wrote previously, if the coil can't be pushed of the core easily but hand, it's better to carefully cut away the coil than to wreck the core.

You don't want to destroy the core, last CIH list on D21314 core was $587.82!!!!

Here's what happens if you get rough with the core!



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John T

02-04-2018 14:15:15




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 Re: H4 magneto condensor to short to reach grounding screw in reply to slydog, 02-04-2018 13:28:47  
You ask " What do I do now?" A properly done short splice would work.

"Also is there a way to test my old condenser" YES a true full fledged capacitor tester will work and if you're good with an old style analog ohm meter a "kickback" test can provide some degree (although not perfect or complete) of evidence of its condition. Basically if its always a total dead short its bad or if its completely open (IE no capacitor action whatsoever) its bad. Once charged a good condenser is an open circuit to further DC current flow, but when discharged it will initially accept current flow.

There's a good chance an old condensor may be better then a new out of the box unit, give it a try. With no condenser in the circuit at all it can still fire albeit weaker plus the points will burn prematurely, but if its a dead short you get no fire at all.

Try the old one n see what happens.

John T

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slydog

02-04-2018 14:50:53




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 Re: H4 magneto condensor to short to reach grounding screw in reply to John T, 02-04-2018 14:15:15  
I robbed a condensor from another mag I had and it seems to work although I have spark it is pretty weak. I am thinking my next step is going to be replace the coil. FYI this mag is the one that would work great when the engine was cold but when it warmed up it would start to miss and sometimes even quit and the motor would stop. Then I couldn't get it started until the engine cooled down and then it would start right up. Would the coil be the cause of something like this?

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John T

02-05-2018 04:58:44




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 Re: H4 magneto condensor to short to reach grounding screw in reply to slydog, 02-04-2018 14:50:53  
Ignition problems that happen ONLY after she gets good n warm can possibly be coil or condenser related. Again if theres no condenser at all in the circuit or its weak she can still spark although its weaker and the points will burn sooner.

Another problem can be points that are burned pitted and/or carboned, you might check that.

Since a condensor is so much cheaper then a coil Id try that before a new coil.

John T

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old

02-04-2018 15:17:27




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 Re: H4 magneto condensor to short to reach grounding screw in reply to slydog, 02-04-2018 14:50:53  
When the engine is running the coil does start to warm up and if it has a bad spot in the coils wires it will do just as your is doing so simple answer is yes your coil may well be getting bad



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old

02-04-2018 13:51:10




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 Re: H4 magneto condensor to short to reach grounding screw in reply to slydog, 02-04-2018 13:28:47  
Condensers almost never go bad but new ones are now likely to be bad from the get go. I have not change a condenser in well over 10 years now



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