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Allis Chalmers Discussion Forum

Can't shut B down

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Rex in Australi

06-08-2007 02:45:06

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Gidday gurus.
Question - there is a hole near the bottom of the "distributor" cap on the magneto. Is that where an earth goes to shut this thing off? If so, what does it line up with and how are you supposed to operate it? I have to shut the fuel off to stop this tractor at the moment. While I have other items apart fixing some oil leaks, I may be able to make something up for the magneto?
Thanks,
God Bless,
Rex

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Rex in Australia

06-09-2007 15:58:19

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Re: Can't shut B down in reply to Rex in Australia, 06-08-2007 02:45:06

Thanks for all the advice and comments. This is crank start only, no battery or anything. I'll try earthing the points out and see how it goes.
Thanks again,
God Bless,
Rex

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El Toro

06-08-2007 12:50:29

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Re: Can't shut B down in reply to Rex in Australia, 06-08-2007 02:45:06

Here's a picture of an old mag that has the grounding posts on both sides of the mag. Hal

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El Toro

06-08-2007 12:10:27

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Re: Can't shut B down in reply to Rex in Australia, 06-08-2007 02:45:06

There should be a grounding post on the side of the mag. You can stop the engine by pulling the coil wire from the cap. If you decide to pull the mag make sure you make a note of where the rotor is pointing. Make a sketch on paper. Once the mag is removed don't crank the engine.
Then when reinstalling the mag you turn the rotor to the position on your sketch and install the mag. This is so you don't have to bring No1 piston to TDC on the compression stroke. Hal

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ed in cny

06-08-2007 11:06:09

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Re: Can't shut B down in reply to Rex in Australia, 06-08-2007 02:45:06

You may have the shut off on the engine of the mag. I have seen them on both sides. They are both the same model but one on the outside and the other on the engine side and you can't see it without taking the mag off. I have both on the 42 and 48 B's I have. Check if it's on the inside. Good luck.

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BCnT

06-08-2007 07:31:49

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Re: Can't shut B down in reply to Rex in Australia, 06-08-2007 02:45:06

if the post mentioned is missing and you dont have time to send out for repairs...run a insulated 14# wire from points to a toggle switch pole...run other pole to ground/earth...you will have to flip switch to the ''on'' position to kill tractor.

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Jerry Coulter

06-08-2007 04:50:33

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Re: Can't shut B down in reply to Rex in Australia, 06-08-2007 02:45:06

The hole on the cap itself is a vent. Keep it open or moisture may collect inside the mag.

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George Andreasen

06-08-2007 04:46:49

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Re: Can't shut B down in reply to Rex in Australia, 06-08-2007 02:45:06

Both the Fairbanks and Wico magnetos should have a threaded, insulated post on the side of the mag body. Grounding this post grounds the primary coil and shuts down the mag. If the post is missing you should send it to a repair shop. Pretty simply repair/replacement and not too expensive.

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Matt L

06-08-2007 07:46:31

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Re: Can't shut B down in reply to George Andreasen, 06-08-2007 04:46:49

I found on my '39 if ya ground it out to stop it it doesnt wanna restart.

I end up just choking it till it does with the choke lever.

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El Toro

06-08-2007 11:53:33

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Re: Can't shut B down in reply to Matt L, 06-08-2007 07:46:31

That's not a good idea to use the choke when shutting down an engine. You could be washing the
oil from sleeves or cylinder walls. Hal

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Rex in Australia

06-08-2007 14:44:48

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Re: Can't shut B down in reply to El Toro, 06-08-2007 11:53:33

Thank you good people!
I looked and looked through books and information on the magnetos, and nowhere did they mention the grounding posts. I will have a look and work something out.
Just shows again the good things on these web pages. Friends who help each other.
God Bless,
Rex

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El Toro

06-08-2007 15:08:29

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Re: Can't shut B down in reply to Rex in Australia, 06-08-2007 14:44:48

An easy way to check to see if have a grounding post is to use your mult-meter set on ohms and and touch from the grounding post to the frame of the mag. You should have continuity. Hal

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Rex in Australia

06-08-2007 21:03:20

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Re: Can't shut B down in reply to El Toro, 06-08-2007 15:08:29

I had a look. There are no grounding posts, or holes where they would have been. This mag has been replaced at some time, but the numbers appear to be the correct one for the the B, however it does not appear to have been set up with the grounding system. Would it be the same to run a wire from the points in order to ground out the points wire? Or could that damage the unit? Spent years as a mechanic, but hardly saw a magneto in that time. Cheers
r

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El Toro

06-09-2007 06:57:20

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Re: Can't shut B down in reply to Rex in Australia, 06-08-2007 21:03:20

If you have battery start on your tractor you can convert your mag to a distributor. You would use an auto type coil, ignition switch and wire from the switch to the coil and then to the points in the mag. You would need to disconnect the mag's coil wire at the points. Just an idea since some of these mag's lose their magnetism in their magnets and this what creates the hot spark in mags when the magnets pass by the coil. The old mag I posted has that problem, but its over 60 years old. Here's a picture of a conversion. Hal

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El Toro

06-09-2007 04:30:37

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Re: Can't shut B down in reply to Rex in Australia, 06-08-2007 21:03:20

That's what I would do to shut it down. They used mags on just about everything years ago. The mags were very dependable if they were kept from the weather elements. Most people just left their equipment outside and then griped when it wouldn't start. That mag picture I posted was off a Standardtwin garden tractor. They were made back in the 1930's until WW2 started. One of the best garden tractors ever made. All gear driven with 2 speeds forward and reverse. They had a mult-disc clutch that ran in oil too.

The military used a lot of mags on their tank engines before they went to diesels. Some of the engines had 4 mags. Hal
PS: Here's a picture of the Standardtwin. I restored 5 or 6 back in the 70's and one Viking.
I may put the Viking on too. Its the orange color
tractor.

third party image

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