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Allis Chalmers Discussion Forum

B power plant

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07-05-2018 19:15:57

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Hello, A/C guys. I've got a NH 1280 self-propelled baler that someone repowered with an
A/C model B-15 power unit. Who ever did the re-power did a very nice job.
Made the appropriate belt covers as needed and such.
It might be just a touch underpowered for the baler, but it works for me. However, this year and toward the end of last year, it would run good and work for an hour or so, the just cough, sputter and act like no gas and finally die. So I would take the carb apart, blow it out, put it back on and away we'd go for a while.
I've kinda come to the conclusion that perhaps the Mag is a bit weak and while I was
"cleaning" the carb, the engine and Mag cooled enough so it would run again.
I have run into that over the years while I was a farm machinery mechanic.
Upon closer inspection, I see it has a different than original Mag on it.
It has a type J mag on it. I was wondering if I changed the condenser in the mag if that
would help. Also I know of a couple of little A/C combines that have power units on them.
I assume those mags would work on mine? Also not sure where to go to fine a tune up kit for the Mag either. I'll try the Agco dealer tomorrow. that should give them a laugh!! I've worked on lots of different engines over the years, but very few A/C's. Thanks in advance for any and all help!

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07-06-2018 18:43:43

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 Re: B power plant in reply to Wheat47, 07-05-2018 19:15:57  
try this site for parts.

https://www.yesterdaystractors.com/cgi-bin/store/model_parts.cgi?SearchArea=Allis-Chalmers&&md=B&cat=Electrical System&r=mcats

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Dick L

07-06-2018 04:07:22

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 Re: B power plant in reply to Wheat47, 07-05-2018 19:15:57  
If you have a good 1/4" spark jump from the spark plug wire to the block as soon as it dies your magneto is most likely not the problem. If you don't have a good spark from the wire to the block as soon as it dies you most likely do have a weak magneto. They do loose the magnetic charge sometimes which will make them hard to start even cold. I would lean toward a bad coil or condenser if you have a good fuel flow for a minute or two from the carburetor. Without doing the checks it is a shot in the dark as to the cause.

I would start with a new set of points and condenser anyway.

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07-05-2018 19:17:58

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 Re: B power plant in reply to Wheat47, 07-05-2018 19:15:57  
P.S.----The mag is a Fairbanks/Morse. Is that what they used?

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07-05-2018 22:26:36

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 Re: B power plant in reply to Wheat47, 07-05-2018 19:17:58  
I have a B powerplant, which used to power a ferris wheel, It has the J model Fairbanks Morse mag on it. I live in Washington state, and have access to a man at Camas Washington, that still rebuilds magnitos. I ship him my mags by USPS, and he ships them back to me rebuilt! If you don't have the luxury, of time to wait, then you best find some one local, to rebuild yours.

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07-05-2018 23:22:44

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 Re: B power plant in reply to Ralphwd45, 07-05-2018 22:26:36  
It's on my baler, and I figure to start baling Sun. or Mon.
I'm gonna check out those two old combines and see what they have, too.
Thanks for your response!

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