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  1. #1
    New Member
    Join Date
    Dec 2012
    Posts
    1
    Location
    muskegon, michigan
    Tractor
    farmall super c

    Default mechanic needs help

    I am a mechanic at small shop that repairs everything from lawnmowerers to automobiles. I love old tractors and am in the middle of a restoration on my super c, but that is not my problem. I have a customers 51 8n here that i have replaced plugs, wires, rotor, cap, points, manifold, coil, and a lot of wiring. Carberator has also been rebuilt and we are still having a problem with it running properly, seems to flood out unless the fuel filter is almost empty and it doesnt like to rev up to max rpm. It runs sweet once it does but cant figure why it is hit or miss as to when it will run right. Help!?

  2. #2
    Super Member
    Join Date
    Feb 2006
    Posts
    8,629
    Location
    VA
    Tractor
    JD2010, Kubota3450,2550, Mahindra 7520 w FEL w Skid Steer QC w/Tilt Tatch, & BH, BX1500

    Default Re: mechanic needs help

    Distributor bearings? Plugged breather in carb float bowl? Bad float or float valve?
    This side of 40
    JD2010, Kubota L3450/FEL w SK QC, L2550 w FEL
    Mahindra 7520 [Pinky] /FEL w Skid Steer QC/w Tilt Tatch & BH, BX1500 [Mighty Mouse]
    IH37 Baler, CCM165 Drum Mower, JD Rake
    JD 127 bushog, Flail, SK Tilt Tatch , KK tiller, Rhino rear blade, Post driver, post auger, chipper, pallet fork, Grapple/Loader Buddy, Homemade Splitter/DC Welder

  3. #3
    Super Star Member murphy1244's Avatar
    Join Date
    Nov 2011
    Posts
    17,220
    Location
    Ohio
    Tractor
    Kioti DK-40, MF-135, Ventrac 4500Y

    Default Re: mechanic needs help

    Murph ------------

  4. #4
    Super Star Member murphy1244's Avatar
    Join Date
    Nov 2011
    Posts
    17,220
    Location
    Ohio
    Tractor
    Kioti DK-40, MF-135, Ventrac 4500Y

    Default Re: mechanic needs help

    Quote Originally Posted by holmes1442 View Post
    I am a mechanic at small shop that repairs everything from lawnmowerers to automobiles. I love old tractors and am in the middle of a restoration on my super c, but that is not my problem. I have a customers 51 8n here that i have replaced plugs, wires, rotor, cap, points, manifold, coil, and a lot of wiring. Carberator has also been rebuilt and we are still having a problem with it running properly, seems to flood out unless the fuel filter is almost empty and it doesnt like to rev up to max rpm. It runs sweet once it does but cant figure why it is hit or miss as to when it will run right. Help!?
    What is the plug color?
    Murph ------------

  5. #5
    Elite Member Briana03's Avatar
    Join Date
    Jul 2010
    Posts
    3,292
    Location
    San Diego, California
    Tractor
    None

    Default Re: mechanic needs help

    Welcome to TBN

    I moved your thread to the Ford Vintage Tractors forum.
    Briana
    TBN Support

  6. #6
    Epic Contributor Soundguy's Avatar
    Join Date
    Mar 2002
    Posts
    48,758
    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: mechanic needs help

    external add on fuel filters are a constant source of problem if the wrong type is used.

    flooding out means float is not correct.. or the needle / seat is not correct.

    that's no mystery.

    once you address that.. manually goos carb butterfly to see what rpm you can get.

    does gov pull back even with throttle set to max?

    is throttle and springs and linkage at the gov adjusted to book spec? remember.. no preload or slack on the springs.

  7. #7
    Platinum Member EMB5530's Avatar
    Join Date
    Sep 2011
    Posts
    514
    Location
    Kansas
    Tractor
    5530 Mahindra 4x4

    Default Re: mechanic needs help

    The floats on those carbs rub on the casting of the bowls and get little microscopic cracks that take in enough fuel to not float correct and flood out.
    It has happened on my old tractor(901 Powermaster) as well as a friend of mines tractor(8n)

    Not that it is 100% but just an idea.
    Good luck
    Necessity breeds ingenuity.
    And when your not sure weld it twice

  8. #8
    Epic Contributor Soundguy's Avatar
    Join Date
    Mar 2002
    Posts
    48,758
    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: mechanic needs help

    if yer flaot is rubbing the casting.. it's hinge and or pin is badly worn.. it should not rub by design..

  9. #9
    New Member
    Join Date
    Oct 2011
    Posts
    5
    Location
    unadilla, NY
    Tractor
    1959 Ford 1841,1949 Farmall Cub and a 1978 Cub Cadet

    Default Re: mechanic needs help

    Tractor wasn't designed for use with add on filter.Remember there is no pump. Fuel is gravity feed so anything unnecessary can only impede the flow! Also make sure the gas line runs straight as possible(leave enough clearance away from exhaust manifold so gas doesn't "Vapor Lock")from tank to sediment bowl,making sure to eliminate all "sags".
    They were designed as such: 1- screen at exit of tank 3- sediment bowl
    2- line straight down to sediment bowl(no sags!) 4- screen before entering carburetor.
    One guy removed his inline filter and he was amazed at how much better it started. I learned this from an expert on another site and always figured if the above 4 steps WITHOUT an inline filter were good enough for Henry Ford then it was good enough for me! Good luck and please post back the result! GT65

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