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8n-ford tractor

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Paul Verschelde

02-15-2007 10:58:11




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I have an 8-n ford tractor with front mounted distrubutor It has very weak spark, and will not run. Points look good and set at .025. A 12 volt system has been installed. How can I improve the weak spark? I really need some imput on this matter.




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Paul Verschelden

02-15-2007 11:53:19




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 Re: 8n-ford tractor in reply to Paul Verschelden, 02-15-2007 10:58:11  
Thanks for all of the replies and I will check into each response and let ya all know what happens.



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Dell (WA)

02-15-2007 11:43:10




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 Re: 8n-ford tractor in reply to Paul Verschelden, 02-15-2007 10:58:11  
Paul..... .just incase you missed this, the frontmount ignition points (0.015) are best set on the kitchen table. It's a 2-bolt, 15-min job to unsnap yer 4-nipple cap and letter dangle. Walk into the kitchen and set the points per specs: (0.015"). The squarecan frontmount distributor is driven by an OFF-SET cam-tang drive scheme and CAN-NOT be installed outta time. Gently finger start both bolts and twist yer rotor until it catches with the cam-drive tang, then tighten yer 5/16" distributor bolts. Don't be HAM-FISTED with the bolts 'cuz you'll BREAK yer $300 distributor body..... ..Dell

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Paul in MN

02-15-2007 11:27:34




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 Re: 8n-ford tractor in reply to Paul Verschelden, 02-15-2007 10:58:11  
On the front mount dist, the points should be set to .015". Your wider setting will decrease the intensity of the spark. It is a no cost deal to change the point setting, so that is what I'd start with.

Your coil may have become weak also, but in these conversions, it is real hard to know whether you have a 6v coil that has been partially cooked by using 12 v on it, or whether it is a coil made for 12v. Some of the other members will be able to tell you what the resistance of the ignition resistor(s) should be. Finally, it is often found that a spark problem can be caused by a poor ignition switch. But that is easy to diagnose. Just hook up a jumper wire from one side of the switch to the other side. If the spark improves, replace the switch.

Right now I am working on a spark problem on a front mount 8N, and am totally disgusted with the Horse Sh-- quality of the new parts. I tried to get the best by paying the exorbinate price at CNH. The new condenser from their kit would not even fit in the space in the dist because the mounting strap was spot welded on about 1/8" over from where it should have been. I could go on!

Reset your points first, and then bypass your ignition switch. Maybe that will be enough to make 'er run.

Paul in MN

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K.LaRue-VA

02-15-2007 11:27:34




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 Re: 8n-ford tractor in reply to Paul Verschelden, 02-15-2007 10:58:11  
This is the things I would check - in order.

Did they used solid core wires? Some tune ups switch to modern resistor core wires which dont work as well.

When was the last time the ignition switch was replaced? High resistance through an old switch could cause a weak spark.

The 12-volt conversion may have used a 12-volt coil or they may have used a 6-volt coil with additional resistance. The coil has to be matched up with the resistance in the ignition circuit for a total of around 3.6 to 4.0 ohms. If the coil was replaced you mey have too much resistance in the ignition circuit.

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old

02-15-2007 11:27:16




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 Re: 8n-ford tractor in reply to Paul Verschelden, 02-15-2007 10:58:11  
As H says your point gap is wrong and is probably what your problem is. Set them at .015 and if that doesn't fix the problem post back for more help. Also when your resetting them take a piese of clean paper or a $1 bill and run them through the points just to make sure they are clean



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HCooke

02-15-2007 11:21:26




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 Re: 8n-ford tractor in reply to Paul Verschelden, 02-15-2007 10:58:11  
Front mount point gap should be .015.



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K.LaRue-VA

02-15-2007 11:39:39




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 Re: 8n-ford tractor in reply to HCooke, 02-15-2007 11:21:26  
Wow, I missed that .25 completly. I must be blind or brain dead. You probably nailed the problem.



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