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Allis Chalmers Discussion Forum
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Re: Allis Chalmers B

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Ben Riddle

04-21-2013 11:16:46

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Yes the motor is free And it will turn over I just can"t get it to start in better terms. I had a buddy tell me to take a spark plug out and connect it to the plug wire then put the plug up next to the block and turn it over to see if it has fire. I did that and it will spark so I"m guessing the magneto is okay? It"s just frustrating because my grandfather could have told me what to do and now he is no longer here. I appreciate everybody"s advice on here thank you.

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Ben Riddle

04-23-2013 19:58:38

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 Re: Allis Chalmers B in reply to Ben Riddle, 04-21-2013 11:16:46  
UPDATE: today I went and bought a new cable to run from the starter to the battery because the other one was fried. That made it turn over a lot faster which I was happy to see and the cable doesn't heat up anymore. Now it is able to pull gas to the plugs which I was also happy to see but I have ran into another problem. It now seems to have lost fire to the plugs. Any suggestions? Thanks guys

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Dick L

04-24-2013 11:51:03

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 Re: Allis Chalmers B in reply to Ben Riddle, 04-23-2013 19:58:38  
Two things to check first. The very first thing is to make sure the pull switch is in the correct position. I have one that you pull the switch out to start and another that I have to push it in to start. They both look alike. If you don't know how to check the switch just remove the wire on the side of the magneto. The switch to a magneto just shorts it out to the frame.
The other first would be to clean the points. Many times the points have a film form that keep them from making a spark.

Those can be done without removing the magneto.

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Ben Riddle

04-24-2013 13:02:25

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 Re: Allis Chalmers B in reply to Dick L, 04-24-2013 11:51:03  
Dick L , this tractor has a key switch so could there still be a problem there? An where are the points located and how do you get to them without removing the magneto? Thanks

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Dick L

04-24-2013 19:42:12

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 Re: Allis Chalmers B in reply to Ben Riddle, 04-24-2013 13:02:25  
Two screws on the cap. Remove cap. Tape the rotor so it will not turn. Remover four corner screws and remove cover. The points are in right there. If the rotor turns the teeth will not mesh correctly when replacing the cover and you will have to retime the magneto.

If you have a magneto and not a distributor and a key switch, it still only shorts out the points so you do not have a spark. A magneto makes its own voltage unlike a distributor that needs voltage from a battery.

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Dick L

04-24-2013 19:45:04

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 Re: Allis Chalmers B in reply to Dick L, 04-24-2013 19:42:12  

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04-21-2013 19:00:57

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 Re: Allis Chalmers B in reply to Ben Riddle, 04-21-2013 11:16:46  
does it have a generator or an alternator? If it has an alternator it is set up for 12 volts. What gauge wire goes to the starter? If it is a small gauge, like on a 12 volt auto, it is too thin. That is why it heats up. You need #1 or #0 wire for 6 volts.
If it doesn't spin over how did you get a spark. If it spins and doesn't start and you have spark, pull the plug and squirt some gas into each cylinder, reinstall to plugs and see if it will start. LOL Bob

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