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James Durrant

07-11-2000 07:36:47

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I'm trying to start an Allis B, it had been running a year or so ago. The plugs are clean but I am not getting a spark when I turn it over, does the mag need cleaning? The tractor belongs to friends, and I would really like to have it running in the next week, before I leave. I do not really understand how mag engines work, but I do normal engines. Are there points inside the mag?

Where does the throttle need to be when I try to start it?

Could any one please help?

Thank you

James (Aged 16)

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07-11-2000 21:03:30

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 Re: HELP, HELP in reply to James Durrant, 07-11-2000 07:36:47  
James, I see that you are only 16 but you seam to have a great interst in old tractors. One thing that i have not seen any one mention is that if you have to start a tractor engine with a hand crank make sure that the magneto is timed rite. If the timing is off to far and the engine fires there is a good chance that it may KICK back against the crank. results broken bones, or air borne, or at the very least a mighty sore arm and shoulder. I know these things from exprenice.

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Mike (MI)

07-11-2000 10:02:43

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 Re: HELP, HELP in reply to James Durrant, 07-11-2000 07:36:47  
A mag engine functions the same way a lawn mower engine works. A magnet flys by a coil of wire, inducing a current in a primary coil. At that instant, a set of points connected to the primary winding open, allowing the magnetic field to collaps quickly. (faster that the magnet can come away from the coil) When the magnetic field colapses, it induces a current in the secondary winding that fires the plug. The points need to be in good shape, make sure the kill switch is working right, as well as the wire running to the mag. The switch should be open to run. The kill wire can't be grounded any where or it will not run. The distributor part of the mag needs to be in good shape too, just like on a car. Be very careful taking the mag apart, especially if you don't have a maunual for it. Sometimes it is not all that plain how it goes back together. Timing is critical - it needs to be timed just the way it is now, or it won't run. Be sure you understand how to time all of it BEFORE you take it apart. These mags have what is call a "impulse-coupling". Internally, there is a device that delays when the magnets go by the coil, and it "snaps" them past. It should snap a few degrees past top dead center. From what I remember, it was about 8 to 10 degrees past TDC. Once you have spark back, crack the throttle some, and it should take off and run. Note: It also had a condenser in there too. Tractor Supply or some of the local auto parts stores have points for these things once in a while - you never know. Good Luck!

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James Durrant

07-12-2000 01:01:40

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 Re: Re: HELP, HELP in reply to Mike (MI), 07-11-2000 10:02:43  
Thankyou for your help. I'll let you know how it goes!


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