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Subject: 8N front mount

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mike vernon    Posted 03-02-2018 at 15:17:10 [URL] [DELETE]        [Reply] [Email]  
  • 8N front mount
  • Been a while since my last question from Maine re: uncle's49 8N. its been down for ov er a year having given up on my inability to figure problems out. "Won't start" delema "fixed" fall '16 with new condenser. Got it back to its shed, idled for 30 minutes, turned off and that was it. Fall '17 towed out of woods and trailered to mechanic friend. New coil(old one had about 5 hours on it) got it running great again. Parked it back in its place, starting and running every other day in seasonally cool temps. The day arrived for its big job. Backed out and engine "stumbled" and stalled. Been in yard,covered, since then.
    Thinking its time for 12V conversion and new wiring harness. But it sure would be encouraging to get it running again before that! Could ballast resistor failure killed coil, again. It ran for a couple hours with the new coil before its relapse. 75 tips says 10:1 maintainance but for me its been 1:10! Just want to work uncle's tractor(same age as me)

    36 coupe    Posted 03-04-2018 at 13:51:18 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 8N front mount
  • Have you check to see if the tractor has a ballast resistor and that its wired right.500,000 N tractors came from the factory in 6 volts.Your tractor should run fine on 6 volts.Autos and trucks went 6 volts in the mid fifties because of larger engines that needed more cranking power.increased lighting,air conditioning,radios and larger heaters.Ford didnt offer sealed beam headlights until 1939 and heaters until 1940.Most engines were under 240 cubic inches.The big Olds and Caddy V8s had a long hi amp 6v battery.Buick straight 8s used the long battery.My 640 has a tail light,work lite and a pair of head lights.You should measure the Voltage at the coil top terminal with the points closed.You should have the original Ford Ballast resistor on the tractor.

    mike vernon    Posted 03-04-2018 at 09:48:13 [URL] [DELETE]        [Reply] [Email]  
  • Re: 8N front mount
  • Thanks again for the advise. Spring is coming even in Maine. I will continue the search then

    Mark    Posted 03-03-2018 at 08:57:07 [URL] [DELETE]        [Reply] [Email]  
  • Re: 8N front mount
  • Hi Mike, I'd like to second Bruce's recommendation...I think he's spot on. 10 years back I had a motorcycle that wouldn't start. I made a lot of assumptions and spent a ton of time and money on a new coil, cam sensor, battery...without ever checking for spark. Turns out both spark plugs went bad, unusual, but it happens. Fixed it in 2 minutes for $3. Good luck in tracking down your problem. Mark

    Bruce (VA)    Posted 03-02-2018 at 15:25:21 [URL] [DELETE]        [Reply] [Email]  
  • Re: 8N front mount
  • You now have a 6v tractor that won't run. Until you find the reason for that, you will have a 12v tractor that won't run either.

    Regarding the coil.......About 5 years ago, my neighbor proudly told me about fixing his 8N. Seems like it wouldnít start, so he replaced the coil. Tractor started, problem solved. I asked him if I could have the old coil. He gave it to me. I put it on one of my 8Nís where it has been ever since.

    I do not know why his tractor would not start. I do not know why it did start and ran fine after he put a new coil on it. Sure, I can make a lot of guesses, but we will never know for sure.

    But I do know he did not have a bad coil.

    Think about this the next time you are inclined to just start replacing parts w/o determining if the part is defective.

    But to fix your problem...........donít guess at the cause of the problem; guessing can get expensive. And leave you breathless chasing every guess.......it could be this, it could be that......just troubleshoot the problem and leave the guess work for buying Lottery tickets.

    Check for spark and fuel. (tip # 13)

    You need to answer 2 questions before you do anything else:

    With the bolt in the carb bowl removed and the gas on, will the fuel flow fill a pint jar in less than 2 minutes?

    Next, get out your adjustable gap spark checker * , open the gap to 1/4", hook it up, turn the key on and crank the engine. Does the spark jump 1/4"? Post back with the answers.

    And do not buy a new part for the tractor until you can answer this question: how do I know the part on the tractor is defective?

    * Don't own an adjustable gap spark checker? Buy one! Not a test light! Until then, take an old plug, open the gap 1/4" ground it to the head & look for spark. Itís not the color of the spark that counts; itís the distance it jumps. https://www.amazon.com/AMPRO-T71240-Energy-Ignition-Tester/dp/B00A8FO87S/ref=sr_1_fkmr1_4?ie=UTF8&qid=1513273147&sr=8-4-fkmr1&keywords=ampro+spark+checker

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