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Subject: 1951 8N 12 volt Runing real rough

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Rick P.    Posted 09-28-2020 at 20:28:44 [URL] [DELETE]        [Reply] [Email]  
  • 1951 8N 12 volt Runing real rough
  • Hello,
    Im new here so I'll try to be brief on my issue. Tractor was running fine then lost power and ran rough but kept going to finish the job, Cleaned all of the fuel system, replaced resister after test output at 4v., Runs worse, will idle, wont throttle up, seem overloading on fuel. Coil tested in limits: 10.8 ohms 2nd, 2 ohms prime. replaced plugs: AL 437, .025 gap, She runs like she is missing, points gap .015, seem to be sparking regularly from testing.
    Any advice is greatly appreciated.
    Thank you in Advance, life just isn't the same without my 8N! :(

    Bruce(VA)    Posted 09-29-2020 at 13:12:31 [URL] [DELETE]        [Reply] [Email]  
  • Re: 1951 8N 12 volt Runing real rough
  • Use the correct gap.

    Jump the resistor to see if that helps. It won't hurt the coil.

    You have a 6v coil, hence the need for a resistor. If jumping the resistor helps, go to NAPA and get a " real " 12v coil. p/n IC14SB, 3.25 ohms internal resistance.

    Tim Daley(MI)    Posted 09-29-2020 at 06:18:20 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 1951 8N 12 volt Runing real rough
  • Welcome aboard, Rick! As a newbie the best investments you can make are getting copies of the ESSENTIAL MANUALS. Keep handy, read religiously, and study the archives and HOW-TO's forums here. Get a copy of "75 Tips for N-Owners" by Bruce(VA) and a copy of "WIRING PICTOGRAMS" by JMOR as additional essential documents. Don't know how you are 'testing' things, but I see one problem out the gate. Fist, don't use model year as criteria for verifying things. A '51 8N would have the ANGLE MOUNT distributor and thus point gap is set at .027" +/- .001". You said your point gap is set at .015". Go by whether it is a front mount or a side mount unit. Model years only matter if you are restoring an early model to all original anyway. Next is to avoid guessing to problems. Would of, should of, could of, I think, and tried replacing (fill in the blank) such and such a part. True root cause problem solving is the key to any problem. Whish resistor are you talking about? There is no resistor on a side mount. Don't assume just because you have a 12V battery the system is wired correctly. 99.93% of all non-starting issues are due to mucked-up wiring, and of those almost as many are due to some sort of "12-Volt" switch over job being done. Many times incorrect wiring will drain the battery so have it tested at a shop and while he's doing that, verify the entire wiring system. Use the manuals, OEM 6V/POS GRN setup shown, get 12V from JMOR's Pictograms. Know how it was wired original, then if you have to have 12V, be sure it gets wired correctly as such. Know if you have a front mount or side mount - it matters. Use your VOM set to CONTINUITY to test wiring, never use a test light -you don't want any power to test with. Start here.

    CORRECT FORD 8N ELECTRICAL SYSTEMS - 6V & 12V:



    8N 12V SWITCHOVER ON THE ANGLE (SIDE) MOUNT DISTRIBUTOR:

    *PICTOGRAMS courtesy of JMOR

    FORD 8N TRACTOR WIRING DIAGRAMS; PRIOR TO S/N 8N-263843 (FRONT MOUNT):




    OEM 8N WIRING(6V/POS GRN) AFTER S/N 8N-263844 WITH ANGLE (SIDE) MOUNT DISTRIBUTOR:


    FORD 8N TRACTOR ESSENTIAL OWNER/OPERATOR/PARTS/SERVICE MANUALS:


    Rick    Posted 10-01-2020 at 18:28:33 [URL] [DELETE]        [Reply] [Email]  
  • Re: 1951 8N 12 volt Runing real rough
  • Thanks guys for the comments, still trying to find time to work on it again to see where things go,

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