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Allis Chalmers Discussion Forum

Allis B

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Herb Maine

07-02-2007 06:35:44

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Hello Allis friends. I have recently done a quite a bit of work on my Allis Model B. A valve job, new carb, wires etc. When I put it back together I wasn't getting spark and found the Mag cap to be broken. I got that fixed and it runs but not great. At an idle it runs fine. I give it some throttle and and skips and sputs and blows back through the air cleaner enough to blow oil out of the oil bath flange. I have tried adjusting the carb but I think maybe it could be a timing issue???? My mag has been changed over to include a coil and condensor on the outside with wires going into the mag points. On the fiber gear on the mag cover I see a dark line. No other markings at all. On the steel gear on the inner mag I can not identify any marks at all. Does anyone have any hints on how I can determine if it is timed properly or not? I appreciate all your help for this rookie antique tractor guy. I love doing this and I'm learning a lot. I'm almost ready to get another one already.

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Bobby Rakestraw

07-06-2007 05:29:43

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Re: Allis B in reply to Herb Maine, 07-02-2007 06:35:44

Well let me ask a couple of questions that may pin down a range on when my "B" was made? What years was the adjustable front end placed on the B? I noticed in one picture of a S/N posted that there is no raised letters direct in front of serial number plate. My B has in front of the plate raised letters saying "Tractor No" was this on all B's?

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Jerry Coulter

07-02-2007 13:16:53

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Re: Allis B in reply to Herb Maine, 07-02-2007 06:35:44

The little steel gear should have a tooth with an edge beveled off. Turn that tooth straight up and the line on the fiber gear straight down and mesh them together.

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Herb (Maine)

07-02-2007 17:51:35

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Re: Allis B in reply to Jerry Coulter, 07-02-2007 13:16:53

Thanks Jerry. That worked and it's running much better.

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Dick L

07-02-2007 07:20:01

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Re: Allis B in reply to Herb Maine, 07-02-2007 06:35:44

A lot of the time with that kind of problem wires are switched. Make sure your wires are as in the picture below.
third party image

To make sure it is on time I have way to get to exact time. This will check out ever time with a timing light. At least it has for me for 40 some years.
Take all the plugs out. Place a plug on number one plug wire and clamp the plug base to the tractor somewhere you can watch for spark as you turn the crank. Inch the crank until the number on plug sparks. Then go to the other side of the tractor and make sure the (TDC) line is in the center of the inspection hole between the two 5/8" bolt holes. When the TDC line is in the center at the exact time you have spark to number one plug you will have the (FIRE) line in the center when checking with a timing light.

I also use the TDC line when lining up the gears in the mag when the marking are gone. You still have one tooth on the small gear that is tapered. At the TDC I get the gears set for the rotor to point to number one terminal.

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Bobby Rakestraw

07-03-2007 19:05:52

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Re: Allis B in reply to Dick L, 07-02-2007 07:20:01

I just purchased a Allis C that I have now been told is a Allis B. But I noticed on your picture the dist Cap is on its side while the one on my B is upright. What is the difference?

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Steve Jelf So KS

07-03-2007 20:04:50

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Re: Allis B in reply to Bobby Rakestraw, 07-03-2007 19:05:52

Bobby, if there's any question about whether your tractor is a B or a C, look at the serial number stamped next to the shift lever. There will be a B or a C in front of the number. You can use the serial number info on this site to find the year of manufacture. The upright distributor cap probably means your tractor has been converted from magneto to distibutor ignition.

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Bobby R

07-04-2007 10:11:39

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Re: Allis B in reply to Steve Jelf So KS, 07-03-2007 20:04:50

Well the only item I was able to read was the B so I will assume I have a B. Is there any other thing thaat I can use to determine year it was made.

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Steve Jelf So KS

07-04-2007 19:27:48

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Re: Allis B in reply to Bobby R, 07-04-2007 10:11:39

While some parts changed over the years, and can give clues, the only way I know to pin down the year of manufacture is by the serial number. Since the number is located in front of the shift lever, it hasn't been worn off. More likely it's filled with paint. A little excavating with a pocket knife or sandpaper should uncover the number. For further confirmation that you have a B, here's a page with a picture of a 1939 B pulling an All Crop harvester. Note the distinctive arched front axle, and the steering arm that goes down (on the C it goes up). You can find more B pictures in the YT picture archive.

Booneville 2006

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Herb (Maine)

07-02-2007 17:49:16

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Re: Allis B in reply to Dick L, 07-02-2007 07:20:01

Thanks for this info. It is extremely helpful. Being a new comer to the tractors, could you tell me what one would be the number one plug. Would it be the one closest to the fan or the one closest to the seat?

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Dick L

07-02-2007 17:58:07

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Re: Allis B in reply to Herb (Maine), 07-02-2007 17:49:16

Next to the fan.

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