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A bizarre problem?

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Jeff Zurschmeid

03-24-1999 08:26:38




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I wonder if anyone on this board might have a clue about a perplexing problem I have with my 1942 Model C.

Cylinders 1 and 2 will not fire with the park plug wires connected to the plugs, but fire just fine if you hold the plug wires about 1/4" away from the plug end
and let the spark jump.

I'm using a set of (suppressor) wires cadged off of an MG Midget, and a set of plugs
approximated from the local NAPA auto parts
store.

Any clues?

JZ

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Packrat

03-28-1999 17:21:37




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 Re: A bizarre problem? in reply to Jeff Zurschmeide, 03-24-1999 08:26:38  
If I were you I would get rid of those suppresion wires and go to the old solid copper core wire, we've used A-C 45s for 30 years, even our oil users with much success.



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Brian Watson

03-25-1999 13:15:55




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 Re: A bizarre problem? in reply to Jeff Zurschmeide, 03-24-1999 08:26:38  
I agree with Ron. Sounds like your plugs are fouled. Look at them all, wet oily black carbon on them indicates oil fouling. This will happen if your engine uses some oil and never gets worked hard for long periods of time like when it was new and used for plowing. Fluffy black carbon on the plugs means too much fuel. Try leaning the carb a bit. The plug for this application if I'm not mistaken is Champion J-8. This is what should be used for heavy work. If you only use your tractor for light work or just riding around, try using a Champion CJ-14 or a J-19LM. These plugs are normally used in 2 cycle engines and are a hotter heat range to burn off oil. The suppression wires are only needed if you have or plan to use electronic ignition. Either way, start with a clean set of plugs. Hope this helps. Brian

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Dave Fullmer (TN)

03-26-1999 12:01:46




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 Re: Re: A bizarre problem? in reply to Brian Watson, 03-25-1999 13:15:55  
The plugs I always used in my Allis B and WC back in the 50's were H-10's. Because of my oil burners, I switched to the hotter J-ll plug. I am not even sure if Champion makes these any more, but you should be able to find a cross reference in the parts stores. I believe these were the standard plugs to use in AC tractors.



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Ron

03-24-1999 11:32:54




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 Re: A bizarre problem? in reply to Jeff Zurschmeide, 03-24-1999 08:26:38  
Have you tried a new plug, or checking the gap? I would also try swapping the plugs and/or wires from #1 to #4. This will at least tell if it is a plug or a wire before you buy anything else. My $0.02. A dirty plug will sometimes not fire at low voltage, but when you hold the wire 1/4" away, you increase the capacitance between the coil and ground, causing the coil voltage to rise and when the spark jumps that gap , it has enough energy to also jump across the plug gap before it all leaks away through the dirt on the plug.

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Ron

03-24-1999 11:07:22




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 Re: A bizarre problem? in reply to Jeff Zurschmeide, 03-24-1999 08:26:38  
Have you tried a new plug, or checking the gap? I would also try swapping the plugs and/or wires from #1 to #4. This will at least tell if it is a plug or a wire before you buy anything else. My $0.02. A dirty plug will sometimes not fire at low voltage, but when you hold the wire 1/4" away, you increase the capacitance between the coil and ground, causing the coil voltage to rise and when the spark jumps that gap , it has enough energy to also jump across the plug gap before it all leaks away through the dirt on the plug.

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