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Subject: 8n tractor

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Emilio    Posted 02-22-2019 at 12:37:52 [URL] [DELETE]        [Reply] [Email]  
  • 8n tractor
  • Bought a tractor, it ran for a couple of hours then died, could not get it started,
    some other problems were starter went out, flywheel ring was broke, I replace started, flywheel ring, point condenser, coil, wires, cap,new carburetor. Timing was way off, so I messed with it for a couple of weeks, finally got it to start, for a couple of weeks it would turn over but would die as if it was not getting any fuel, the problem was the hose from carburetor to air cleaner, it was sucking air, I put tape on end of hose and now tractor starts, sometime I do not even have to use the choke, it starts real easy, it will sit and idle like forever, Now my problem is when I put it in gear it dies, I have checked point gap, plug gap, I know the carb is not the problem, maybe someone has an idea what is causing it to die. Sorry for long post.

    Jack - Iowa    Posted 02-23-2019 at 17:05:58 [URL] [DELETE]        [Reply] [Email]  
  • Re: 8n tractor
  • Emilio

    You replaced the distributor cap and the plug wires. Are you positive you got them in the right places and in the right order? Timing being "way off" makes me wonder.

    One thing you should never do is just throw a bunch of new parts at an engine. Best to figure out what is wrong and fix that as there is always the possibility of inducing more problems with the new parts.

    The new carburetor in particular is suspect. Likely it is foreign made and they don't seem to worry about quality. You may want to have your original rebuilt.

    Everyone seems to be discounting a vacuum leak. I can tell you from sad experience that will create a bunch of weird problems. I had a carb someone drilled an extra hole in. The mounting gasket covered it for years but the gasket got old and started leaking. FUN!

    Good Luck

    emilio    Posted 02-25-2019 at 11:45:57 [URL] [DELETE]        [Reply] [Email]  
  • Re: 8n tractor
  • Thanks, I got it to run, however it does not have POWER to pull anything,
    I drove it around alittle, its dies but will start fairly easy.
    Something is just not right, still working with it.

    Jack - Iowa    Posted 02-25-2019 at 19:51:09 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 8n tractor
  • Tell us what you did to get it running. Perhaps someone will have an idea as to where you go next.

    Rustyal    Posted 02-23-2019 at 07:58:07 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 8n tractor
  • I know you are saying the carb is not the problem. But you obviously have spark or it won’t idle. Sounds like a clogged passage somewhere in the fuel system.

    Tim Daley(MI)    Posted 02-23-2019 at 07:45:09 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 8n tractor
  • As stated, the air cleaner hose is not your problem. Is your fuel sediment bulb valve OPEN 2 FULL TURNS? Did you perform the fuel flow test? How do you know the carb is not the problem? Is it OEM and have you removed, cleaned, and rebuilt it? Are the plugs wet? If continuous cranking results in non-starting, it's possible plugs are fouled. Remove, dry/burn off fuel -I use an electric candle lighter, then clean ends with a small brass wire brush, then check gap again -.025" The Starter should have just been rebuilt, especially if original. How did you determine it 'went out'? "...Timing was way off so I messed with it for a couple of weeks..." Huh? Asking again -front mount or side mount? It takes maybe an hour to rebuild a front mount and get the timing/points set correctly. Don't know what a couple of weeks would yield. Side mount timing procedure is in all the manuals -do you have any? Start with the basics -fuel, spark, compression concentrating on the first two.

    Tim Daley(MI)

    emilio    Posted 02-23-2019 at 11:20:47 [URL] [DELETE]        [Reply] [Email]  
  • Re: 8n tractor
  • Thanks

    Tim Daley(MI)    Posted 02-23-2019 at 12:24:09 [URL] [DELETE]        [Reply] [Email]  
  • Re: 8n tractor
  • Emilio-
    Often suspected 'fuel issues' turn out to be electrical issues and vice versa. OK, you have a 12V switch over job, with a side mount distributor. Perform the fuel flow test to rule out if the carb is the issue. You don't need the air hose connected to do that. If carb passes, 1-pint of flow in 2 minutes, put hose on carb then proceed to the electrical system. If carb fails, remove and rebuild properly or have someone qualified do it if you don't know or don't want to try it on your own. I have some already rebuilt on my shelf ready to go -my email is open. While carb is off, verify the wiring is all correct on your tractor. Use the LINK below to our HOW-TO'
    s for JMOR's Wiring Pictograms. Scroll down til you find your side mount 8N and then scrutinize your setup to the diagram. 12V, no generator or voltage regulator wired in, and an alternator, and a 12V coil? If wiring passes, reinstall carb and try again. If wiring is different, determine the incorrect problem and fix.

    Tim Daley(MI)

    Bruce    Posted 02-22-2019 at 16:35:02 [URL] [DELETE]        [Reply] [Email]  
  • Re: 8n tractor
  • 6v or 12 ? Front or side distributor?

    emilio    Posted 02-23-2019 at 11:18:27 [URL] [DELETE]        [Reply] [Email]  
  • Tractor
  • 12v side distributor

    Rusty 2N    Posted 02-22-2019 at 15:07:42 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 8n tractor
  • Are you saying you blocked off the air flow from filter can to the carb? Would be same as pulling out choke lever and holding it out.

    emilio    Posted 02-22-2019 at 15:25:35 [URL] [DELETE]        [Reply] [Email]  
  • Re: 8n tractor
  • What I am saying is that the hose is old and even with a
    hose clamp it was still sucking air, wrapped tape around each end of the hose and my tractor starts.

    Jack - Iowa    Posted 02-22-2019 at 19:34:10 [URL] [DELETE]        [Reply] [Email]  
  • Re: 8n tractor
  • It should run just fine with that hose removed. Might indicate a vacuum leak around the manifold or carburetor. Once you find and fix that leak, then check your air cleaner as it should not be giving you that much choking action.

    With it running spray around the edges of the intake manifold and the carb connection with propane. When the engine changes, you have hit the leak.

    Rusty 2N    Posted 02-22-2019 at 16:36:30 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 8n tractor
  • Check out Bruces 75 tips found in the how to section in the red bar top of the page.

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