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Allis Chalmers Discussion Forum
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allis b

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dblair

07-14-2017 06:42:57




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I'm new on this forum , I usually post in Oliver or Pulling . I bought a B with a mower on it last year and it started acting up . it misses a little when the temp get up and has no spark if you stop it for gas or what ever . it's probably the coil or condenser in the mag what are your experiences with this . thanks .




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tractorguy2

07-15-2017 21:42:20




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 Re: allis b in reply to dblair, 07-14-2017 06:42:57  
I don't know how some of the members on this site get so many bad condensers. I buy and sell about 40 magnetos a year. I put new points and condenser in all of them. I've never had a bad new condenser in the last eight years.

I would suspect the coil is bad. Most Allis B tractors used the FM J4B3 magneto. They are known for bad coils. I would also put the points and condenser in it.



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dblair

07-15-2017 04:40:08




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 Re: allis b in reply to dblair, 07-14-2017 06:42:57  
thanks again guys . I bought a coil right here on this site and will put it in , I haven't bought a condenser yet . thanks everyone for their input .



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tractorguy2

07-16-2017 08:03:31




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 Re: allis b in reply to dblair, 07-15-2017 04:40:08  
The coil on the FM magnetos is fastened with two slotted set screws in the top of the housing. You need to first clean all the dirt and carp out of the holes and screw slots. I use a tiny ball cutter and Dremel tool to clean the slots.

Most times the screws require heat to get them out. A good hot air gun or propane tourch will do it. Just heat the side of the housing where the screw is.



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jocco

07-15-2017 05:44:38




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 Re: allis b in reply to dblair, 07-15-2017 04:40:08  
If you are dealing with the magneto (depending on type) make sure the metal areas where it mounts are clean and check the wires and connections inside for corrosion.



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Jocco

07-15-2017 04:08:12




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 Re: allis b in reply to dblair, 07-14-2017 06:42:57  
I will add: I have seen when engine gets warn if condecer is bad they start backfire. Some times they will start skipping and rounding rough like out of time. I have not seen as many bad condenser as old says but there are different types using correct one is important.



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old

07-15-2017 09:27:50




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 Re: allis b in reply to Jocco, 07-15-2017 04:08:12  
A condenser is nothing more then a capacitor and having the correct MFD one of a higher MFD is the way to go if you can find that info that is.



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Traditional Farmer

07-14-2017 17:49:42




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 Re: allis b in reply to dblair, 07-14-2017 06:42:57  
I'd still replace the condenser 1st because its a whole lot cheaper.



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old

07-14-2017 21:07:34




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 Re: allis b in reply to Traditional Farmer, 07-14-2017 17:49:42  
Ah but a new condenser now days is a 50/50 chance of it being god/bad right out of the box. I do not replace condensers any more since I have had as many bad ones that where new as I have had good ones



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Traditional Farmer

07-15-2017 00:40:08




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 Re: allis b in reply to old, 07-14-2017 21:07:34  
So what do you do if you have a bad one?



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old

07-15-2017 09:14:38




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 Re: allis b in reply to Traditional Farmer, 07-15-2017 00:40:08  
Hope you luck out and get a good one. But in all my years of messing with engines I have yet to have a bad one. Condensers are pretty much like battery ignition coils if wired up correct they are almost bullet proof. Only time I have seen a battery ignition coil go bad was when it was 6 volts and hooked to 12 volts.
On mags the coil goes bad due to getting to hot to many times. Way back in the day Gravely had a recall on there machines due to the mag getting to hot so they figured out a way to ventilate them

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old

07-14-2017 09:03:22




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 Re: allis b in reply to dblair, 07-14-2017 06:42:57  
In a mag yep once hot and you loose spark most likely the be a bad coil. Condensers almost never go bad unless they start to leak



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dblair

07-14-2017 14:27:41




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 Re: allis b in reply to old, 07-14-2017 09:03:22  
thanks Old that's what I thought might be . I appreciate the conformation .



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