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Subject: 8N

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Gordon    Posted 10-01-2023 at 12:54:47 [URL] [DELETE]        [Reply] [Email]  
  • 8N
  • I have used my 8N for 15 years without much trouble. I am now having an issue and could use some advice. The tractor starts and runs fine but after about 5 to 10 minutes it quits. It restarts immediately but quits again. I have drained the gas and replaced the filter and can not see any evidence of rust or other foreign material in the gas. It has a front mount distributor. I was told by someone that it could be the coil. Any suggestions on how to proceed.

    Farmer Brown    Posted 10-11-2023 at 04:20:25 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 8N
  • My 9N once acted the same way. It was unpredictable whether it would restart. I replaced the coil and haven't had that problem since.

    Dead Eye Dave    Posted 10-07-2023 at 07:17:54 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 8N
  • I noticed that Gordon mentioned replacing a fuel filter. The 8N has no external fuel filter. Could it be that someone has added an external fuel filter? Could that lead to this problem? Dave

    Bruce(OR)    Posted 10-10-2023 at 12:20:29 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 8N
  • Depends upon the time span of "immediate restart".
    Coils generally take time to cool down and external filters generally take time to refill.
    A loose wire or connection can bounce open, kill the engine, then bounce shut allowing for immediate restart.
    My Crystal Ball is in need of batteries and without a proper physical diagnosis of the machine in question each suspicion has an equal amount of weight.
    Power wire to the points is another favorite of mine going through the dist housing and then to the points themselves. I suspect the silence of the original poster is an indicator that the problem is either solved, sold, scrapped or shelved.

    Bruce (VA)    Posted 10-01-2023 at 13:36:11 [URL] [DELETE]        [Reply] [Email]  
  • Re: 8N
  • You need to tell us first if it’s 12v or 6v, with a front or side distributor.

    These tractors are amazingly simple machines; they are over 70 years old and were designed to be maintained by the operator.

    Some basic troubleshooting skills and a few common tools will get them running. Randomly replacing parts doesn’t get you much.

    But…………your friends (and maybe your experience ) will often get in the way of fixing your tractor. Rarely are guesses like "It's the coil" helpful. We can make a long list of possible causes for the tractor not running and start picking our favorite to check out. Or, we can step back and recognize that the trick to fixing these tractors (or trouble shooting any piece of equipment) is to be systematic about it. You need to isolate the problem system by system, step by step and work from most likely to least likely and replace parts only when you confirm they are defective. Jumping ahead to 'so-and-so said it could be whatever' or just replacing parts will waste your time and your money.

    It takes three things for an engine to run: spark at the right time, compression, & gas/air in the right mixture. Compression is easy; check it with a gauge. But, you don't lose compression overnight, so if your tractor won't start, or suddenly cuts off, forget about compression for the moment, & concentrate on narrowing the problem to fuel or spark. If you don't do that, you are going to end up chasing your tail around that tractor & spending a boatload of money to fix what could easily be a loose wire or a clogged fuel tank vent. I offer this advice from personal experience because I am not a magician. I do not have the magical ability to simply diagnose the problem & go right to the fix. And I don’t like playing guessing games either. So, whenever my tractors stop, I confirm both spark & fuel then go from there.

    I might not be capable of telling you why your tractor isn't running, but I sure can tell you how to figure it out for yourself.

    Bottom line: as soon as the tractor stops running, not 5 minutes later, check for spark, fuel and battery voltage.

    Does the tractor have a spark that will jump 1/4" in open air?*

    Will the gas drain out of the carb bowl in a steady stream and fill a pint jar in less than 2 minutes?

    What is the EXACT voltage at the battery? ( yes, you need a multimeter for that, not a worthless light)

    How do I know this part is defective?

    These are the questions you need answered before you attempt any repairs or buy a new part.

    *If you don’t own a spark checker w/ an adjustable gap ( NOT a light) buy one. In the meantime, an old spark plug w/ the gap opened to at least ¼” will work. Ground it to a rust & paint free spot on the engine turn the key on & look for a spark.

    Amazon.com: 【The Best Deal】OriGlam Spark Plug Tester, Adjustable Ignition System Coil Tester, Coil-on Plug Ignition Spark Circuit Tester, Autos Diagnostic Test Tool : Automotive

    Bruce(OR)    Posted 10-03-2023 at 21:38:25 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 8N
  • "restarts immediately but quits again"

    Bad ign switch.

    Wiggle wires with volt meter attached

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