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Allis Chalmers Discussion Forum
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AC WD45 Magneto replacement?

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Mike1187

07-24-2005 15:15:08




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My neighbor has a WD45 that we use to mow his field(a lot of it has not been done in a long time becasue it was not running) A couple years ago, I had a local guy who fixes tractors come out and get it running, and it ran great. Toards the end of last yeat, it died on me in the middle of the field and needed towed back in. This year I couldnt get it running for more than 2 minutes.

I called the guy out again to look at it, and everything has been gone over, and it stil just wont run. after a lot of work, we can get it running for a little bit, but not very good. The only thing left is the magneto itself, and from what I am hearing it cannot be bought/repaired anymore(at least not around here) We had someone who deals with mags look at it, and he said the magnets seemed pretty weak, and the armature wasnt looking too great either.

I found a few mags that look like they should work, but they are for the WD, not the WD45. I have been told that the WD45 requires a mag with a higher output to work properly.

The guy who does my work also mentioned that it may be possible to remove the mag and install some sort of distributer system instead, but dosent know if it is possible with this tractor.

What are the best options to get this tractor running as soon as possible, and on a low budget? Would a mag from a WD work, or should I find one from a WD45? I'm trying to find a simple, effective(at least for the next 5 or so years until he can afford a different tractor) solution that wont break the bank since my neighbor has already put more money than he can really afford into the tractor.

Thanks,

Mike

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Bill(Wis)

08-11-2005 16:18:32




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 Re: AC WD45 Magneto replacement? in reply to Mike1187, 07-24-2005 15:15:08  
Sounds like a sticking carburetor needle valve. When the carb floats go down with the fuel level they allow the needle valve to come down out of its seat and allow more fuel to enter the carb. The only thing that causes that needle to go down is gravity. They are notorious for sticking in the closed position allowing zip fuel into the carb. Try trouble shooting by tapping the side of the carb right after you get it started. Sometimes the vibration will bring the valve out of its seat and you'll be OK until next time. Thoroughly clean the carb and especially the valve and seat. You're probably getting gum deposits from gasoline. Today's gasoline is more volatile than in days past and evaporates quickly. The more you use the tractor the better. Every day is best and don't let the fuel get gunked up.

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Stu (ON)

08-09-2005 16:12:21




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 Re: AC WD45 Magneto replacement? in reply to Mike1187, 07-24-2005 15:15:08  
Check this site for the FMJ4 mags.



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Glen in TX

07-25-2005 07:44:22




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 Re: AC WD45 Magneto replacement? in reply to Mike1187, 07-24-2005 15:15:08  
Mike, You need to check the fuel system like the others said. If you don't have any fire out of the mag I can check it and or rebuild/exchange. A rebuilt battery distributor may cost as much or more than the mag repair depending on what is wrong unless you find a dist. bargain local. All parts are still available for the Fairbanks Morse X & J mags and Wico X & C mags. If some other mag parts are limited. New mags are still made also but most old ones can be rebuilt reasonably. Any 4 cyld. mag that is CW clockwise rotation with a 30 degree impulse should work on it.

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AD that doesn't belong HE

08-09-2005 09:20:28




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 Re: AC WD45 Magneto replacement? in reply to Glen in TX, 07-25-2005 07:44:22  
Go away... MORON...



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Sid

07-25-2005 07:11:19




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 Re: AC WD45 Magneto replacement? in reply to Mike1187, 07-24-2005 15:15:08  
I will repeat what has been said. The WD45 did not come from the factory with a mag. That means you have a early WD or a tractor that has been altered. "Toards the end of last yeat, it died on me in the middle of the field and needed towed back in. This year I couldnt get it running for more than 2 minutes." Your statement leads me to believe you have a fuel flow problem. This more often happens at the tank where the sediment bowl is. I have found more than one bugwing or flake of rust in the pet cock or in the opening in the bottom of the tank. Make sure you have good fuel flow before you go any farther. I won't say it wont happen but I have never had a problem like you describe where the Mag was at fault. A coil yes but you do not have a coil if you have a mag.

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JMS/MN

07-24-2005 20:21:48




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 Re: AC WD45 Magneto replacement? in reply to Mike1187, 07-24-2005 15:15:08  
alliswc is right. Either tractor can be equipped with a distributor instead of a mag. Same mounting casting.



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alliswc

07-24-2005 16:37:50




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 Re: AC WD45 Magneto replacement? in reply to Mike1187, 07-24-2005 15:15:08  
the 45 was never equiped from the fractory with a mag. if the tractor has a mag it must be a wd. post some photo's of the ingintion system so we know what you are talking about. did you check to make sure the engine was getting enough fuel, there could be some dirt,rust in the fuel system. find someone near you that has or knows how to fix A C tractors, your mechanic sounds as if he does not know what is wrong with the tractor.

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