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  1. #1
    New Member
    Join Date
    Jul 2010
    Posts
    2
    Tractor
    1948/9 8N 12v

    Default 8N has no spark

    8N won't start after tune up. This 8N was converted to 12v. many years ago, I have replaced the points, rotor, in-line resistor,disp. cap. capacitor and still have no spark. (I even tried a new coil to no avail).
    The front mount disp. has the square coil with a single wire to it and it shows 12 volts to the wire, and to each of the contact point at the other end.
    What else could possibly prevent spark?

    I attached an ampmeter to the wire connection at the cap and did not see any voltage jump when cranking the engine.

  2. #2
    Gold Member
    Join Date
    Sep 2001
    Posts
    292
    Location
    wright city, mo.
    Tractor
    KUBOTA L3000DT, FEL.

    Default Re: 8N has no spark

    HELLO,
    i had a TO20 that had the same problem.
    check all of the wire connections, to see if
    there isn't one just holding on by a few strands.
    that was the problem i had. after i cut the wire
    back, and reconnected it, everything was ok.
    good luck
    accordionman
    wlbrown
    wright city, mo.

  3. #3
    Veteran Member K7LN's Avatar
    Join Date
    Feb 2009
    Posts
    1,545
    Location
    Michigan
    Tractor
    JD455 & JD790

    Default Re: 8N has no spark

    Quote Originally Posted by dogeman View Post
    The front mount disp. has the square coil with a single wire to it and it shows 12 volts to the wire, and to each of the contact point at the other end.

    I attached an ampmeter to the wire connection at the cap and did not see any voltage jump when cranking the engine.
    I'm not at all familiar with your ignition setup. The amp meter and voltage comment is a little confusing. Is it possible that the points are set too far apart and not making contact while cranking? 15 to 20 thousandths should do the trick.
    JD 790 w/70 FEL & 7 BH on turf tires
    JD 455 w/60" MMM & 54" front blade

  4. #4
    Super Member RickB's Avatar
    Join Date
    Sep 2000
    Posts
    7,491
    Location
    Eastern NY
    Tractor
    Case 885, Ford 4000

    Default Re: 8N has no spark

    The primary ignition circuit is open. Either at one of the coil connections, within the coil itself, between the coil and points, or at the points (not closing, or not making contact when they do close).
    We have too much gun control.
    What we need is more idiot control.

  5. #5
    Veteran Member banjodunn's Avatar
    Join Date
    Jun 2008
    Posts
    1,224
    Location
    Oz

    Default Re: 8N has no spark

    G'day give the contacts of the points a light rub with some very fine emery as they are usually shipped with an anti corrosion film that will not let them make contact


    Jon

  6. #6
    Epic Contributor Soundguy's Avatar
    Join Date
    Mar 2002
    Posts
    48,364
    Location
    Central florida
    Tractor
    ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 941D, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC

    Default Re: 8N has no spark

    ditto what rick sad.

    if there is no voltage drop, there is no closed circuit.

    could be points or the primary pig tail., or an open primary..

    soundguy

  7. #7
    Gold Member
    Join Date
    Jul 2008
    Posts
    493
    Location
    Volney, NY
    Tractor
    mahindra 2615

    Default Re: 8N has no spark

    If you still cannot find the problem, go to the Yesterday's tractors website, and look up the ford spot. There are a couple of old timers on there who can build-em in their sleep. They helped me a couple of times with my 2n.

  8. #8
    Epic Contributor Soundguy's Avatar
    Join Date
    Mar 2002
    Posts
    48,364
    Location
    Central florida
    Tractor
    ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 941D, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC

    Default Re: 8N has no spark

    Rick and I post over there at YT... he's not likely to get any better advice, 'so far' than what he has already gotten. ( Rick is a NH mechanic afaik.. )

    soundguy

  9. #9
    Super Member RickB's Avatar
    Join Date
    Sep 2000
    Posts
    7,491
    Location
    Eastern NY
    Tractor
    Case 885, Ford 4000

    Default Re: 8N has no spark

    Quote Originally Posted by Soundguy View Post
    Rick and I post over there at YT... he's not likely to get any better advice, 'so far' than what he has already gotten. ( Rick is a NH mechanic afaik.. )

    soundguy
    But not many know that I won't qualify for 'old-timer' status until next year.
    We have too much gun control.
    What we need is more idiot control.

  10. #10
    Epic Contributor Soundguy's Avatar
    Join Date
    Mar 2002
    Posts
    48,364
    Location
    Central florida
    Tractor
    ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 941D, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC

    Default Re: 8N has no spark

    Quote Originally Posted by RickB View Post
    But not many know that I won't qualify for 'old-timer' status until next year.
    Yeah I didn't want to volunteer you up for being an old timer.. just pass on your expert status.

    soundguy

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