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  1. #21
    Veteran Member
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    Jul 2003
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    1,695
    Location
    Central VA, USA
    Tractor
    Mahindra 6000 MWFD, 2 1950's Farmalls, 1974 Farmall 140, 1967 Mf 135Delux

    Default Re: Farmall A spark problem

    Quote Originally Posted by norwaytractor View Post
    How do I find what kind of engine I have in my tractor?
    I think C-113, byt not sure.
    The tractor is a -46. Tryin' to find what kind of compression I am suppose to have.
    It's a 113 CI...its also thermo syphon cooled, make sure you have good coolant and the radiator isn't clogged...while you have the atf in the cyl.. you can flush the system, refill up to about 1 1/2" from the top of the radiator, if you fill it full, it will just blow that much out anyway...BobG in VA

  2. #22
    Epic Contributor Soundguy's Avatar
    Join Date
    Mar 2002
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    48,583
    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: Farmall A spark problem

    ps on thermo syphon.. just mix coolant % for anticipated freeze. most TS don't work good at mixes past 30/70 and work great around 50/50 if you can get away with it climate wise.

    pre mix it to.. it won't mix easily in a ts system

  3. #23
    Veteran Member
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    Jan 2009
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    2,213
    Location
    Carroll, Ohio
    Tractor
    Massey 180 Diesel

    Default Re: Farmall A spark problem

    Compression ratio on that engine is 6:1.

  4. #24
    New Member
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    Oct 2012
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    13
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    hareid
    Tractor
    Farmall

    Default Re: Farmall A spark problem

    Ok, thanx for all the info
    I had aprox 90 psi in 3 of the cylinders, and about 60 in one of them. (cyl 2)

  5. #25
    Epic Contributor Soundguy's Avatar
    Join Date
    Mar 2002
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    48,583
    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: Farmall A spark problem

    90/60

    ? dry or wet or?

    without doing both.. a comp test is nearly worthless...

  6. #26
    New Member
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    Oct 2012
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    Farmall

    Default Re: Farmall A spark problem

    I did a dry test. Did not think about the wet
    Will do asap

  7. #27
    New Member
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    Oct 2012
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    Farmall

    Default Re: Farmall A spark problem

    Quote Originally Posted by norwaytractor View Post
    I did a dry test. Did not think about the wet
    Will do asap
    I did a wet test,and the compression went up to aprox 100psi on each cylinder.

    But one more thing.. I have raised this question before, but I don't see any answers to it.
    When measuring between the coilwire and ground I get a full conection. I guess this is suppose to be this way, as I did the same test on a different Farmall I have, with the same result. But I do not understand why? Is not this wire suppose to be isolated from ground, and conect to ground each time the points are touching?

  8. #28
    Epic Contributor Soundguy's Avatar
    Join Date
    Mar 2002
    Posts
    48,583
    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: Farmall A spark problem

    look this pic over.

    primary will pe common to chssis if points are closed.

    if using metal core wire and measuring from the end of the escondary, when points are closed, it will be common too.

    notice the schemetic of an automotive ignition coil... everything is common...

    soundguy

  9. #29
    New Member
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    Oct 2012
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    Farmall

    Default Re: Farmall A spark problem

    Finally solved the problem, and the tractor is running like a dream
    It was a combination of several things.
    After changing back to the old plug wires, tha spark looked much stronger. Must have been something wrong with the brand new ones.
    After this I moved the fireing order to 4-2-1-3, just as a test, and the tractor fired right up
    I guess the magneto has been placed with a 180 degree misplacement somewhere back in time.
    I also tried this last week, with no result, so that must have been the wires holding back.

  10. #30
    Member
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    Jan 2012
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    46
    Location
    Texas
    Tractor
    John Deere AR, a # of Farmalls, AC WD45, couple of Fords and a Massey Harris

    Default Re: Farmall A spark problem

    You have it fixed Never mind my 2cents.

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