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ford 8n not enough spark??? wont start!

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BOOE

09-28-2006 05:37:36




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alright. well i have an old 8n ford tractor adn i just painted it. well got it all back together and it wont start. no spark at all. so i messed with it a bit and the coil wire just broke in half. so i replaced all wires and the coil. still no start. i now have power to the coil. power out of the coil, but not a very big spark. i took the wire off the coil and grounded it on a bolt and turned over the engine and i get a small yellow pulsating spark but not very big at all and it cant jump a gap at all. i checked my wires and there was no major damage or anything wrong with them. So what else should i look for? any ideas would be GREATLY appreciated. nothing worse than having a pretty tractor that wont run!

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coflyboy

09-28-2006 19:36:52




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 Re: ford 8n not enough spark??? wont start! in reply to BOOE, 09-28-2006 05:37:36  
From the symtoms you stated, you could have a bad condenser.



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souNdguy

09-28-2006 06:56:20




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 Re: ford 8n not enough spark??? wont start! in reply to BOOE, 09-28-2006 05:37:36  
Check this chart int he 9n/2n/8n forum. Lots of the iagnostic work is there for you.

Soundguy



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souNdguy

09-28-2006 06:50:13




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 Re: ford 8n not enough spark??? wont start! in reply to BOOE, 09-28-2006 05:37:36  
You don't mention what distribuitor you have.. this would have been helpfull info, as well as the charge system voltage.. oem 6v? or 12v conversion.

However.. from what yuo are saying.. I'm gonna assume 6v and side mount distribuitor.

First thing. You painted it. Have you removed the ground clamp cable and sanded the spot down to bare metal and reinstalle dit, and then cleaned battery cable and terminal ends?

Now.. the coil wires need to be metal core.. not modern auto carbon resistor / supressor core.

Have you reset and dressed or replaced the points.

Is the primary wire from the ignition switch to the side coil good and have clean connections ? does the other side of the primary wire from the coil to the distribuitor feed thru bushing have good clean ends and connections?

Does the wire to the ignition switch have clean connections? Have you repalced the ignition switch?

Try jumpering right from the battery to the primary input side of the side mount coil, and see what you get.

Also.. check to see that the distrib is well grounded. Run an ohm check from points base plate to the chassie and make sure it is virtually -0-. Otherwise you can add a supplemental ground from the distrib to the chassie.

Make sure points bushing is intact and that points aren't shorting to ground. make sure the distrib feed thru bushing is intact.


post back with more specific info to get more specific help.

Soundguy

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BOOE

09-28-2006 13:31:21




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 Re: ford 8n not enough spark??? wont start! in reply to souNdguy, 09-28-2006 06:50:13  
sorry, i still have the 6 volt system with a newer style front mount round coil. I had a few spots in the wire from the switch to the coil so i replaced the whole wire. I then stuck a battery charger on the input side of the coil and tried it and i still just got a really small yellow spark from the distributor wire. The coil wire i replaced it with is supposed to be a factory ford tractor replacement. i cleaned my points and everything. like i said i didnt take anything apart. i just painted it. Im not really sure how to check the ground on my distributor. It seems to be its got a weak ground somewhere but i cant seem to find where. Thanks a ton for all your help!

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souNdguy

09-28-2006 20:31:26




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 Re: ford 8n not enough spark??? wont start! in reply to BOOE, 09-28-2006 13:31:21  
Hmm.. there are no front mount round coils. Which is it.. a front mount distrib with a square coil.. or a sid emount distrib with a round coil? Or is this a cob job where a round coil has been fitted to a front mount distrib?

A battery charger on the coil.. how big a charger? if it was a small job.. it may not have been up to the task.

CNH 'factory wires are universal 4 cyl replacement, and are most likely carbon core... Since you really need metal core..check them. Even though CNH inherited ford tractors.. they don't always come thru with historically accurate parts.. especially when they try to make 1 size fits all parts like plug wires..

If you can't check the ground on your distrib.. you may need someone to help you with this project.

Check from breaker plate to chassie with a vom.

Soundguy

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Booe

09-29-2006 05:18:22




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 Re: ford 8n not enough spark??? wont start! in reply to souNdguy, 09-28-2006 20:31:26  
well i was hoping it was something simple that i overlooked but i guess not so i broke out the dvom and i have 6.4 volts to the coil, about 5.8 coming out, 5.8 to the dist., 5.4 through all the wiring inside the distributor and 5.4 volts to the points. so. im not sure but it sounds like maybe i have a faulty coil. As for the coil its a round coil and it sits in the front right corner but is actually on the front. im not sure if its a hack job but it looks neat and has worked for the past 18 years. so the only thing i can think of is i got a faulty coil. i just cant seem to get a descent spark out of it.

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souNdguy

09-29-2006 06:14:50




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 Re: ford 8n not enough spark??? wont start! in reply to Booe, 09-29-2006 05:18:22  
I'm guessing that you don't understand 8n terminology. Front mount coils and distribuitors are mounted on the very front of the engine.. like.. under the water pump.. and have a cap with 4 nipples/spark plug wires and a square coil with only 1 connection disible.

Side mount distribs use a round coil that mounts to the right front corner of the engine, and the distrib is setting angled out to the right front side of the block, and has a cap that has 5 nipples, 4 spark plug wires, and 1 coil wire.

It sounds like you have a side mount distribuitor.

It makes it so much easier to help you when you can describe what equipment you have.

At this point it could still be anything to a bad ground at the breaker plate, to coroded points, to a bad coil.

Soundguy

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