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  1. #1
    New Member
    Join Date
    Jan 2013
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    18
    Location
    Felton, PA
    Tractor
    Ford 8n

    Default 8n will fire but not start??

    I spent all day taking my 48 8n apart to put in new points, condenser, coil, wires,plugs, and a solenoid for the starter. I shocked the wowwy out of myself when I took a plug out to check for a spark. It acts like it wants to catch and start but that is it. I have tried it with the chock and with out chocking and no go. the carburetor is leaking where the choke comes into the side. All seems good and I need some advise. I do have to get a starter when this goes out, but as long as it will crank the tractor it stays. I worked on cars in my youth and them cars were close to what the tractor has as far as motors.

    Any advise? I have checked and the carburetor is getting fuel at where the fuel line comes into the carburetor. If I need a new carburetor is it better to get a carb kit or just get a used carburetor? The thing is that I need this tractor up and running by spring and the weather here is in the high 40's so spring may come early at this rate.

    Anyone know how I get to the 8n section on the site? Is it a site where everything is all mixed in?

    Thanks

  2. #2
    Bronze Member PHIL850's Avatar
    Join Date
    Apr 2006
    Posts
    99
    Location
    MASS and Northeast kingdom of VT
    Tractor
    JD 850

    Default Re: 8n will fire but not start??

    My first question is, was it running before all this happened. If so, I would recheck the placement of your spark plug wires. Sounds like they are firing, however, they maybe firing on the wrong cyl do to misplacement.

  3. #3
    Super Member 94BULLITT's Avatar
    Join Date
    Feb 2011
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    7,238
    Location
    Frederick County, VA
    Tractor
    Kubota BX2360 & L4240 HSTC

    Default Re: 8n will fire but not start??

    Are you sure you have the plug wires on correct? If yes then pull the hose of the carb and spray some starting fluid or gum cutter in it and see if it will start.

  4. #4
    Bronze Member crackerjack222's Avatar
    Join Date
    Sep 2011
    Posts
    82
    Tractor
    4430, Ford 7000, MF235

    Default Re: 8n will fire but not start??

    Yep, I had me one of them 8N's years ago. I spent more time working on it than with it.....
    If it hasn't run in a while, I would either replace the plugs or at least clean them. It also sounds like you are getting way too much gas. Those Marvel carbs are dirt simple. I would put a kit in it or at least clean it and make sure the float valve is working.
    In short, clean the plugs, make sure the carb is clean and float valve working.

    Edit: just read your post again and see you have replaced the plugs. Did you gap them?
    Now go after the carb.
    S TX, JD 4430, Ford 7000, MF 235, JD 555

  5. #5
    New Member
    Join Date
    Jan 2013
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    18
    Location
    Felton, PA
    Tractor
    Ford 8n

    Default Re: 8n will fire but not start??

    When I took the distributor off I checked to see where the position of the points cap was and drew it on a piece of paper. I set the points to .025 that came this the kit and rechecked with my set. I marked the pistons on the motor hear. I pulled all the wires out and put them in one at a time and then marked them with tape and marked them with the number from the pistons. I did this with all 4 wires and changed out the spark plugs. I did check the gap and I set them all to .026. I then took all the wires and cut them to length and cut them with a wire stripper to get a short piece of the wire to come up through the hole in the wire metal piece that goes into the distributor cap after I slipped the boots on with a little vaseline.I made sure that the wires were in all the way and slid the boot into place. I checked and rechecked everything before I finished because I did not want to take the metal back off and swing the radiator out of the way. I even gave it a start before I put the metal back on. I am 92% sure that everything was done correctly.

    The tractor runs like a top. Last year it started running for and hour or so and stopping. That was it till the next day or later in the night. This fall it started and acted like it was missing and back fireing and just running poorly. I decided to give the points and plugs an over haul. Before the over haul it acked like it wanted to start but just would not. I cannot tell if it is getting out of fuel but the sound with the new points and plugs does sound stronger that it ever has.

  6. #6

    Default Re: 8n will fire but not start??

    if you have the plug wires correct then rebuild that carb. i have had several over the years with similar problems. fords of that era are prone to carb especially float problems. get the complete kit not the el cheapo only few dollars more. if you even slightly suspect the float replace it. its a seperate order part and very often the culprit.

  7. #7
    Epic Contributor Soundguy's Avatar
    Join Date
    Mar 2002
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    47,601
    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 will fire but not start??

    advise?

    GET A MANUAL!!!!!

    1, a 48 is a front mount.

    points gap at .015

    I'mamazed you can GET a .025 gap on a front mount.

    2, took all morning to take it apart to do points? Please don't say you took the hood or rad off?

    it takes about 10m to remove the 2 bolts holding the distrib on, repalce points, statinc time, and reinstall

    wide gap makes weak sparks.

    correct this.

    fire order is 1-2-4-3

    if it hasn't ran in a while.. put a teaspoon of atf down each hole.. spin her over.

    if gas drops out of carb you are choking her too much.. unless it constantly drips in which case you have a float seat/needle issue and shee's constantly in a state of flood

  8. #8
    Super Star Member murphy1244's Avatar
    Join Date
    Nov 2011
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    16,503
    Location
    Ohio
    Tractor
    Kioti DK 40-Massey ferguson 135-Ventrac 4500 Diesel

    Default Re: 8n will fire but not start??

    Quote Originally Posted by Soundguy View Post
    advise?

    GET A MANUAL!!!!!

    1, a 48 is a front mount.

    points gap at .015

    I'mamazed you can GET a .025 gap on a front mount.

    2, took all morning to take it apart to do points? Please don't say you took the hood or rad off?

    it takes about 10m to remove the 2 bolts holding the distrib on, repalce points, statinc time, and reinstall

    wide gap makes weak sparks.

    correct this.

    fire order is 1-2-4-3

    if it hasn't ran in a while.. put a teaspoon of atf down each hole.. spin her over.

    if gas drops out of carb you are choking her too much.. unless it constantly drips in which case you have a float seat/needle issue and shee's constantly in a state of flood
    Sound Guy, You are good!
    Murph ------------

  9. #9
    Epic Contributor Soundguy's Avatar
    Join Date
    Mar 2002
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    47,601
    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 will fire but not start??

    Quote Originally Posted by murphy1244 View Post
    Sound Guy, You are good!
    it amazes me to see the way people will avoid spending 20$ on a manual for a tractor.. then waste 4 hours taking a hood / radiator / fan off to get to the front of a dizzy that is held on with 2 bolts and really, for practical purposes.. can't be put back on out of time.

    usually the same people that take an hour to pour in 5.5 qts crankcase oil thru the dipstick hole instead of pulling the engine breather off and using the FILL tube

  10. #10
    Super Star Member murphy1244's Avatar
    Join Date
    Nov 2011
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    16,503
    Location
    Ohio
    Tractor
    Kioti DK 40-Massey ferguson 135-Ventrac 4500 Diesel

    Default Re: 8n will fire but not start??

    usually the same people that take an hour to pour in 5.5 qts crankcase oil thru the dipstick hole instead of pulling the engine breather off and using the FILL tube

    Now that's funny, I do agree about the manuals. People spend big bucks on machines and won't buy a 20$ book. Should be a CW song in there,
    Murph ------------

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