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Farmall & IHC Tractors Discussion Forum
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Swapping Mag for distributor

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Mifsud

01-15-2008 18:18:12




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Looking to replace the Mag on a cub (1947) with a distributor and coil set up I already have. It is a 6 volt set up. Need to know the proper way to replace one with the other. The original mag is still on the tractor but for some reason the inner parts where removed. I have the head off of the tractor now because I just lapped the valves. Never replaced one before so I need some good info. on the correct procedure. Also how do you check the coil to see if it is 6 or 12 volts. Thanks

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skyharborcowboy

01-16-2008 18:21:20




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 Re: Swapping Mag for distributor in reply to Mifsud, 01-15-2008 18:18:12  
Piston Powered Aircraft have Magnetos for a reason!

Joe



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Charles E. McNelly III

01-16-2008 18:06:24




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 Re: Swapping Mag for distributor in reply to Mifsud, 01-15-2008 18:18:12  
I think the one thing people forget is that you can't adjust the total advance on the mag as you can with a distributor. With a mag, your getting 35 degress advance whether you need it or not. I have mags on 2 tractors and I would like to go to a distributor so I can play with the timing a little. Just might find a little more horsepower. Charles



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Hoss in Maine

01-16-2008 09:28:47




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 Re: Swapping Mag for distributor in reply to Mifsud, 01-15-2008 18:18:12  
Keep the mag. Later Hoss



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JT

01-16-2008 07:03:46




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 Re: Swapping Mag for distributor in reply to Mifsud, 01-15-2008 18:18:12  
I personally would not go to a distributor set up, I like the mag, the fact, if battery is dead, crank will start it, or you can pull it to start, mags are not a scarey as people make them to be, they are very simple to work on. They seem to be a lot more reliable than battery ignition. My m had a distributor, that is now on the shelf, every time I went to use it, I had to file the points or fiddle with it, I have mags on all my tractors, and I have not touched them since I put them on. Jim

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skyharborcowboy

01-16-2008 00:03:57




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 Re: Swapping Mag for distributor in reply to Mifsud, 01-15-2008 18:18:12  
Across the points. One is placed on the fixed part of the points and the other is placed on the moving part of the points that follow the cam. As soon as you no long have continuity the points are open.



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Janicholson

01-15-2008 21:14:38




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 Re: Swapping Mag for distributor in reply to Mifsud, 01-15-2008 18:18:12  
The Timing mark on TDC with the front cylinder all the way up, and the valves closed on that cylinder (with the head off it is simple to do!)
Put the distributor in so that when it is against the mount surface the rotor is pointing to 1:30 (top right looking forward at the dist.) Set the points at .020" with the cam (in the dist) on a high lobe).
Put an Ohm Meter across ground to the terminal on the side (with it not connected) to the coil)
Turn the distributor in its slots until the meter is unable to decide if it is open or closed. (just hanging at the point of opening. Lock it down and go. This assumes the advance mechanism is good and the springs are correct and not week and broken. JimN

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Mifsud

01-15-2008 22:48:40




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 Re: Swapping Mag for distributor in reply to Janicholson, 01-15-2008 21:14:38  
Jim, Not quite sure I understand how the ohm meter is to be connected. Could you run it down for me again: Thanks



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Janicholson

01-16-2008 05:56:00




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 Re: Swapping Mag for distributor in reply to Mifsud, 01-15-2008 22:48:40  
The distributor (with points adjusted to .020" gap on a high lobe of the cam) is installed onto the engine, not connected to the ignition switch, but just loose where its bolts have slots to allow it to rotate for timing. Set the ohm meter to RX1 and ground one of the leads to the distributor case (shiny metal). Touch the other lead to the connection post on the side of the distributor. This puts the points in series between the leads. As the points open, the meter will show infinate resistance. As they close, there will be near zero resistance. Adjust the position of the distributor in its slots so the place where the points just barely break open. That is the static timing position. Tighten it down attach cap and wires, and attach ignition wires. Keep us informed, JimN

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BillfromIL

01-15-2008 20:53:36




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 Re: Swapping Mag for distributor in reply to Mifsud, 01-15-2008 18:18:12  
I prefer the mags over a distributor ignition. You can hand crank a mag and start your tractor with a dead or no battery at all. Mags are scary to some, but are very reliable. Send me your mag and I"ll fix it. I"m doing two up right now for my MD"s. I have ran one on a b for years. I just park it on a hill, roll a few feet and its running. I don"t even keep a battery in it. Just my two cents. Plus I like to keep things the way they came out. Hope this helps. Good luck!

Bill

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