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Discussion Forum

WD magneto problem

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10-09-2002 18:10:06

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I had the mag rebuilt for my WD but when I reinstalled it I couldn't get it timed right. In the process of trying to get it going it quit firing, so I took in to the bench and found the points were not opening at all. I then put some locktite on the screw, which I figured had loosened and reset the points to .20. I tried to check it for firing on the bench by inserting a wire in a plug hole and putting it about an eigth of an inch to the metal housing while I turned the rotor by hand a few revs, but couldn't see any fire. How do you set the timing on the fiber wheel and the gear wheel? The fiber wheel has an "A" and a "C" on it. I'm getting very frustrated with this and would appreciate any help.

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10-11-2002 05:27:15

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 Re: WD magneto problem in reply to Jim-IL, 10-09-2002 18:10:06  
I reinstalled the mag after matching the "C" with the bevel gear and rechecking the points .20, and had no fire. The points and condensor were new. What else would cause this? I'm sure I had the timimg correct.

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Steve in N.J.

10-12-2002 14:46:43

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 Re: Re: WD magneto problem in reply to Jim-IL, 10-11-2002 05:27:15  
Sneak in the bathroom and borrow the wife's nail file, and run the nail file between the points. You might have a thin film over the points stopping the points from sparking. Then hit it with a little Brakekleen or solvent and then check for spark. Sometimes the coil fails, but always go for the easy stuff first. Most of the time it's somethin' stupid that makes ya crazy. Also, if you have the old points or another set of points, reinstall them and try it. I've had new set's of points go bad once in a while, even a condensor on occasions. Try the inexpensive stuff first. Make sure all the connections to the points are clean. If ya think you need a coil, I have those in stock.... Steve B.

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Duey (IA)

10-09-2002 19:30:43

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 Re: WD magneto problem in reply to Jim-IL, 10-09-2002 18:10:06  
third party image

Here is a photo of the steel gear with a beveled tooth. Duey

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Duey (IA)

10-09-2002 20:12:16

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 Re: Re: WD magneto problem in reply to Duey (IA), 10-09-2002 19:30:43  
Well anyway, the photo is in the Parts & Pieces gallery. Duey

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10-09-2002 19:17:13

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 Re: WD magneto problem in reply to Jim-IL, 10-09-2002 18:10:06  
Lacking the manual with proper proceedures to use the dots for many years, I learned to time the rotor gear this way. Since you have the magneto off the tractor it is all the easier. Remember that the magneto fires when the points open, it does not know where the rotor is pointed. So you don't have to fight the impulse coupling turn the drive coupling backwards, or counter clockwise until the points open and just close. Then turn clockwise until they just start to open. While holding the drive still install the cap with the rotor pointed at one of the terminals, makes no difference which one. To reinstall get #1 on TDC of the compression stroke. If the governor drive has been installed correctly the drive lugs should be at 9 and 3 oclock. Remove the small cap over the rotor and turn the magneto backwards untill the rotor is pointed at the top inside terminal, the one at 10 oclock. The driven lugs on the mag should now be at 9 and 3 also and bolt it up. To set the timing, set the mag so the impulse trips at the "center" or "TDC" mark and you will be real close to the "fire" mark when running.

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10-13-2002 20:28:14

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 Re: Re: WD magneto problem in reply to Butch(OH), 10-09-2002 19:17:13  

Just in case something is or has been fitted with the incorrect magneto, my magneto man says that different tractor makes had the lugs at different positions. For example, an IHC mag will fit on an AC, but it won't work unless you rotate the governor gear a few teeth (I don't know how many.)This is something to remember in case you are trying something. The timing adustment in the slotted hole isn't big enough.

One easy way to check these things is to swap back and forth with a tractor that runs just fine.

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10-09-2002 18:40:49

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 Re: WD magneto problem in reply to Jim-IL, 10-09-2002 18:10:06  
Jim, the small gear has a dot or a mark the fibre gear you set on the C for clockwise rotation on fairbanks on the AC tractor. Clockwise is determined by looking at the drive end.

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