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Allis Chalmers Discussion Forum
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Misses on B

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Ted Boss

05-17-2005 12:48:14




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I am still trying to get the last little problems taken care of on my rebuild. I have new carb, fuel lines, clean tank, new parts in mag. I have an intermitent miss mostly on #1, #4, very occationally on #3. I can hear it when it is running. I put the timing light on to make sure I am getting electrical spart out of mag to plugs. when the misses occure, you can see no electrical coming from mag on plug wire. New wires, and 2nd set of plugs. Why the intermittent electrical miss? When I put a load on (like driving down the road) it is worse. I want to get this taken care of and I have run out of what to do next. I have checked for valves, and intake problems. Anyone know where or what to do next?

Thanks, Ted

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john b in wi

05-18-2005 06:53:25




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 Re: Misses on B in reply to Ted Boss, 05-17-2005 12:48:14  
had same problem on 54 wd-45. it was all in the wires. used newer style auto wire pack and thats when all problems started. she would miss on 1, 2,3, or 4 and in any order or at any time. went to tractor supply and got some solid core wires and all problems were gone with tractor running full power. hope this helps as it sure did help me



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charles cripps

05-18-2005 04:25:15




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 Re: Misses on B in reply to Ted Boss, 05-17-2005 12:48:14  
I am having some trouble also with my tractor, Can you tell me what the firing order is on a C model allis thanks



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wbcelec

05-18-2005 03:39:59




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 Re: Misses on B in reply to Ted Boss, 05-17-2005 12:48:14  
When I saw your post i thought you found a way to get your wife on the tractor!



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Dick L

05-17-2005 14:42:29




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 Re: Misses on B in reply to Ted Boss, 05-17-2005 12:48:14  
Did you recheck your point gap? I set them at .020.



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Ted Boss

05-17-2005 15:06:44




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 Re: Misses on B in reply to Dick L, 05-17-2005 14:42:29  
Yes, point gap is correct also. I am stumped. Can the perminate magnet in the mag be intermitent? I did see just a very small amount of indication of arching on #1 post in mag.

Ted



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xcv

05-27-2005 06:05:32




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 Re: Misses on B in reply to Ted Boss, 05-17-2005 15:06:44  
The FMJ mag sometimes has a problem where the magnet loosens on the shaft. If that happens, you need to have it pinned to the shaft. 1/8 pin will work. You may want to take it to a mag shop for this, OR if you are adventurous you may want to get a parts mag and swap the magnetic rotors. You will need access to a very small puller for the impulse and a press to get push the shaft out of the bearing. You might as well rebuild it if you go that far. There are several sources of bearings, seals, gaskets, etc if you go that route. Good luck. (PS don't forget the paper shim on the bearing if you remove it)

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