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Subject: 9N starting issues

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Evan (ND)    Posted 07-21-2020 at 16:26:02 [URL] [DELETE]        [Reply] [Email]  
  • 9N starting issues
  • Hello, I recently have inherited my grandpas 9N tractor. It use to run like a champ but has been on much lower duty for a few years now. After a closer look after a failed starting attempt I noticed a few things. I have a Zenith carb on it, not the M/S carb. I get gas all the way to the carb but it wasn't firing today. I also noticed I will probably have to work on the starter as well. I'm not sure if the starter issue is leading to this, but it seems like the tractor started to turn over harder than normal today (battery is good.) Any info is helpful. Thanks.

    Tim Daley(MI)    Posted 07-22-2020 at 06:42:40 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 9N starting issues
  • We need a bit more info to better serve you. Is it 6V or 12V? Did you have the battery tested or just assuming if you put it on charge it will be good? Dead battery is the first thing to go when tractor sets idle for weeks. Expect that unless you use a float charger like the Battery Tender. There's nothing wrong with a Zenith carb - if it is a true Zenith -many aftermarket clones are out there and are junk. Parts are basically the same - carb kits supply M/S as well. Got your Essential Manuals? "...I also noticed I will probably have to work on the starter as well..." What did you 'notice'? How did you determine the starter was bad or going bad? Is it the OEM 1-Wire starter motor? Have the battery tested at a shop. Perform the fuel flow test. Don't muck with any carb settings. Go thru entire wiring with the battery off or disconece5td. Use your VOM set to continuity and VOM and NOT a test light. Manuals have wiring diagrams.


    FORD 9N-10505-B CUTOUT ľUSED AFTER S/N 12,500 TO S/N 258504 ON 9N & 2N MODELS ONLY:



    Evan (ND)    Posted 07-22-2020 at 09:42:23 [URL] [DELETE]        [Reply] [Email]  
  • Re: 9N starting issues
  • Within the last two weeks I have cleaned the points, had compression in good levels based on other discussions on here, a good spark using method under the tips page found here, and the battery is good as its new. I also have the 12V system.

    I cant say I smell gas and I believe the carb isn't a knock off but not totally sure.

    Tim Daley(MI)    Posted 07-22-2020 at 11:45:26 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 9N starting issues
  • Evan-
    Did you use a point file to clean the points? Did you remove the front mount distributor to work on it? Did you set point gap to .015" and set/check the timing per manuals? We now know you have a 12V battery. Don't assume just because it is new it is good. They can be junk out the door, especially the cheaper brands. Have it tested at a starter shop or auto parts store -it usually doesn't cost anything to test. Is your coil 6V or 12V? Note the last PICTOGRAM shown in my prior post. It is a 9N/2N for a 12V system with front mount. Trace the additional external 1-OHM resistor. You need to add that if your coil is 6V. Delete if coil is 12V. You do need the OEM Ballast Resistor in the circuit and delete the OEM roundcan cutout. Spark test per '75 Tips for N-Owners' by Bruce(VA or a commercial spark tester will work. Carb is fine -just perform the fuel flow test. Don't go by if you can or can't smell gas. Set a coffee can under the carb. Loosen the 7/16" nut on the fuel line at the carb inlet and point line into can. Open the Fuel Sediment Bulb Valve 2 Full Turns. Observe fuel flow is a steady stream and you fill the can with 1 pint in 2 minutes. Any hesitation or failure to fill indicates problem is upstream on the bulb or gas tank. Test passes? Connect line and repeat using the carb drain plug in bottom. Passes? leave it and move on -it's electrical. 90% of all non-staring issues are due to incorrect wiring regardless if 6V or 12V. So, again, reference the PICTOGRAM to verify wiring is all correct, exactly as shown, no shortcuts or skipped steps.

    Tim Daley(MI)

    Evan (ND)    Posted 07-23-2020 at 08:29:17 [URL] [DELETE]        [Reply] [Email]  
  • Re: 9N starting issues
  • Working on tracing all the electrical wiring and so far so good. Just a few things I noticed that I will also work on over the next few days with continuing with the wiring, points, etc. I have an inline fuel filter before the carb. Based on what I've read here I'll take that off. I also had the tube from the air filter to the carb off to clean that and saw some gas was dripping out of the carb. I assume a float must be stuck inside.

    K.LaRue-VA    Posted 07-21-2020 at 20:15:02 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 9N starting issues
  • Low duty for years often means way behind on basic maintenance. Starter going bad is another symptom of a tractor that needs to be cranked more and more to start. The fix is to catch up on all the things that have been neglected. Start with both ends of both battery cables. Are they proper tractor cables or skinny car junk? When was the air filter last serviced? Distributor service? Nothing wrong with a zenith carb. Many people consider them an upgrade. I several original and replacement types and any clean carb works better than a dirty one. When cranking, does it have good spark? Do you smell gas?

    Evan (ND)    Posted 07-21-2020 at 20:30:31 [URL] [DELETE]        [Reply] [Email]  
  • Re: 9N starting issues
  • I know a few of those things have been fixed and serviced recently. I'll take a look at the others in the morning. Any tips or diagrams on how that carb should be set? I honestly didn't have much luck on the internet looking for Zenith info.

    K.LaRue-VA    Posted 07-22-2020 at 07:29:40 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 9N starting issues
  • The Zenith is a direct replacement. It looks a little different, but adjustment screws are in basically the same places and the procedure is the same as for the original carb. However, as Bruce indicated, "the" problem doesn't have anything to do with carb adjustments. If the engine isn't getting fuel, adjusting won't fix it.

    Bruce(OR)    Posted 07-21-2020 at 23:27:10 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 9N starting issues
  • Why are you adjusting the carb before fixing the electrical?
    Carb adjustment won't fix electrical.
    Your not the first to try nor the last.
    Play with the carb before the electrical repairs and REALLY foul things up.
    Carb screws don't turn themselves. Unless you have poltergeist...

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