JD B wont fire..Need Mag info
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Thread: JD B wont fire..Need Mag info

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    JD B wont fire..Need Mag info

    I was trying to start my ol 1944 JD B.and seen its not firing..I pulled a spark plug,and nothing...I dont know anything about the Mag.except they BITE really hard...lol I know there is some points in it. so any ideal.what I should look for..Tractor has been in shed for the last time it was ran is 3 years ago..and its not a open shed.it has doors to keep shut up.thanks

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    The best money you will ever spend on that tractor would be for a service manual. A very good one is offered at www.davenporttractors.com. Very reasonably priced. I believe Deere still offers a manual, too.

    It is quite likely the points have a little corrosion just from sitting. Touching them up with a points file or fine emery paper won't be difficult to do to see if spark returns. Sometimes the condenser just goes dead. For the long term, a new set of points and condenser is a good investment. Point gap is important. "B" tractors may have a model "C" or model "X" magneto. You need to determine which mag is on it before buying parts. Both are covered in the service manual.

    Oh yeah, does the mag have a "grounding" switch (after market) to shut off the tractor?

    tommyhawk

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    Quote Originally Posted by tommyhawk View Post
    The best money you will ever spend on that tractor would be for a service manual. A very good one is offered at www.davenporttractors.com. Very reasonably priced. I believe Deere still offers a manual, too.

    It is quite likely the points have a little corrosion just from sitting. Touching them up with a points file or fine emery paper won't be difficult to do to see if spark returns. Sometimes the condenser just goes dead. For the long term, a new set of points and condenser is a good investment. Point gap is important. "B" tractors may have a model "C" or model "X" magneto. You need to determine which mag is on it before buying parts. Both are covered in the service manual.

    Oh yeah, does the mag have a "grounding" switch (after market) to shut off the tractor?

    tommyhawk


    I have an original JD Service Manual..And I tranfered it to CD and a file..Ill check out the Points and give that a try,,If it dont work.Ill get new parts..No it doesnt have kill switch on Mag. As a kid..I can remember,My uncle having a Mag off one of old G`s in a vise,working on it.and he asked me to hold a wire for him.while he took pliers and turn it over !!! Yes I remember the Snap noise,and POW!! Im still scared of them..lol
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    Quote Originally Posted by Dishtech43 View Post
    I have an original JD Service Manual..And I tranfered it to CD and a file..Ill check out the Points and give that a try,,If it dont work.Ill get new parts..No it doesnt have kill switch on Mag. As a kid..I can remember,My uncle having a Mag off one of old G`s in a vise,working on it.and he asked me to hold a wire for him.while he took pliers and turn it over !!! Yes I remember the Snap noise,and POW!! Im still scared of them..lol
    I have to say that getting my mag overhauled was one of the best things I did. I used Roberts Magnetos.

    Russ
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    I just had a mag rebuilt for 40 bucks, spend the money.
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    Quote Originally Posted by Dishtech43 View Post
    I was trying to start my ol 1944 JD B.and seen its not firing..I pulled a spark plug,and nothing...I dont know anything about the Mag.except they BITE really hard...lol I know there is some points in it. so any ideal.what I should look for..Tractor has been in shed for the last time it was ran is 3 years ago..and its not a open shed.it has doors to keep shut up.thanks
    Magnetos need service just like a distributor or carburetor that's been out of service for a while. Might be something minor like points need cleaning or a bad condenser. Could also be your magnets are weak and need to be re-magnetized.

    Magnetos are fairly complex and have many small parts. A thorough mag rebuilt will usually run ~ $150-200. A clean and refresh (points, condenser & re-magnetize) could be less.

    When my buddy drags an old IH tractor home I've had to purchase magneto parts here: https://robertscarbrepair.com/services.asp
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    If it ran when put away, it's probably something extremely simple. DON"T file the points, make sure they're closed & drag a dollar bill through them, several times if it makes you feel warm & fuzzy. that should get you sparking again. Then, take the magneto off, take it to the workbench where you can see what you're doing & adjust the points like your manual says.
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