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Allis Chalmers Discussion Forum

Allis B, strange engine rpm...

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05-11-2008 23:04:46

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Dear friends
I have an Allis B 39` with a FM magneto and I have just changed the coil and condenser, not the points they looked fine. And I was very sure that I did put the magneto together right again (the A and C markes against the right teeth on the other teeth on the magneto, A in my case for counterclockwise rotation of the magneto) Hope You guys understand what I mean. Anyway, I started the engine, no problems. Runs just fine, but after i while (3-4 minutes) she starts to spit and blurr, puffing out some whit/blue smoke through the pipe. Running realy bad, she runs almost like she did before when she got hot, thats why I canged the coil. I also then tried to change the angel of the whole magneto, slowley turning it some degrees left/right. No change in the blurry/spitting rpm. I wonder, if I have missed the right position of the A or C with one teeth or two at the magneto gear, so hard to see the exact postiton, could that be the problem anyway? Or is it someting else I have made wrong/not thinking about about? Or do You guys have any other idea/solution to this problem? Please help me out here.
Best Regards
Sweden (so forgive me for my bad english...)

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05-12-2008 07:13:41

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 Re: Allis B, strange engine rpm... in reply to pelle, 05-11-2008 23:04:46  
White/blue smoke might be a bad head gasket of a seal seal bad. Either one will cause it to run ruff. Or you could have a carb problem. I would check all the plugs and make sure they look as they should and keep and eye on the radiator level. Also I would pull the drain plug out of the bottom of the carb and make sure you have a good steady flow of gas there and also do the same at the main jet plug. Put drain plug back into check for flow out the main jet plug. I have a C that will do that every once in a while and after I open up the main jet plug t will clear up and run well till some junk gets in the main again and then it starts doing it again

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Texas Denny

05-12-2008 05:53:13

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 Re: Allis B, strange engine rpm... in reply to pelle, 05-11-2008 23:04:46  
Per, I've read your post three times and find it a puzzle. If the tractor ran good when you started it for several minutes, it seems quite impossible that you made a mistake in assembly of the magneto. Instead, I would turn to a fuel issue. It sounds more like it is being starved for gas - perhaps a restriction in the tank (very common) or a restriction in the settling bowl or line to the carb. I would like to know more about the symptoms that made you change the coil and the condensor.

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Jeff Z.

05-12-2008 06:05:55

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 Re: Allis B, strange engine rpm... in reply to Texas Denny, 05-12-2008 05:53:13  
Same here. I had three cups of coffee thinking about this. My first thought was fuel but the smoke part is strange. Had many with slow flow but not the smoke.
Found most of the time it is a fuel problem from a plugged inlet into the sediment bowl.
Remove bowl from tank and chect the inlet into the top housing.
Tried to send you emails before but having problems with this forum's email.

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Jeff Z.

05-12-2008 06:12:40

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 Re: Allis B, strange engine rpm... in reply to Jeff Z., 05-12-2008 06:05:55  
Forgot to say when the engine starts running rough try chocking it to see if it runs smoother with some choke. If it does it is probably a fuel problem.
Even since there is fuel in the bowl it may not be being pushed out of the bowl to the carburetor fast enough. If you let the engine set awhile fuel will slowly fill the carburetor and it should run good for a minute and then start acting up if there is a restiction.

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05-12-2008 09:40:55

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 Re: Allis B, strange engine rpm... in reply to Jeff Z., 05-12-2008 06:12:40  
Dear Allis Friends!
Thank You so much!
Sounds like Your tip about the fuel-problem could be the main issue! (I pray and hope for that!!!) Because when I give my litte Darling some starting-fluid she starts and runs for a few seconds, that must be on the fluid right? so I will go through my carb this evening and see if that is the problem, looking for "clogging" and dirt. And the reason why I was changing the coil was because she had a tendensy to be hard to start after warm-up, and also som "spitting" and "blurring" after some time of running. (hope I did the right thing changing it...)
Another question; If I by some reason had put the teeth A against the teeth in the magneto, instead of C, would she run anyway? or will she not run att all? could this be the problem? (anyway, she ran for several minutes yesterday, before this problem occured so...)
The radiator level is ok. Like You guys said, I thought the fuel was ok, there was fuel in the bowl, but thats maybe no garantee for the flow?...
So I will get back to You telling more about this. Until its solwed. Promise. I just cant imagine a summer without "orange beautie" right?
Do You have anything else to add? tips? hints regarding this, let me know.
See You soon!
Best Regards Per

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Jeff Z.

05-12-2008 10:22:11

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 Re: Allis B, strange engine rpm... in reply to pelle, 05-12-2008 09:40:55  
I have been thinking about your problem and you might have more than one because of the smoke.
As in the other post there also might be a head gasket problem giving you the smoke.
The other thing is the sediment bowl set up. I don"t really like the way they take gas off of the very bottom of the tank. I drill out the inlet hole down just a little and put in a small lenght of 1/4 inch copper tubing. This way it is not taking gas off the bottom were the sediment builds up. I flush my tank once a year and after doing this I never had a fuel problem again.
Besides cleaning the carburetor remove the sediment bowl housing from the tank and make sure the inlet is clean.
Keep us posted.

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05-12-2008 11:31:44

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 Re: Allis B, strange engine rpm... in reply to Jeff Z., 05-12-2008 10:22:11  
I have now taken the carb of the tractor, cleand the sediment bowl and fuel line from carb to bowl. I realy cant see any dirt grit in the carb. or so, but maybe even small dirts not visible to the eye can cause problems? I dont know?... Do You Guys?
I will tell You more tomorrow, the time here in Sweden is now 9 in the evening so I will be in touch tomorrow! I will also try to clean the tank tomorrow, also the plugs are new. NGK B-4.

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05-14-2008 08:24:59

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 Re: Allis B, strange engine rpm... in reply to pelle, 05-12-2008 11:31:44  
Ok, so Im back! With no luck... sad to say.
Well this is the story for now; I have checked and cleaned the carb so no that one is ok. And in fact, she starts, just like before and runs almost, but just almost ok on low rpm/idle. When i give her some gas she starts to spitt/blurr again, just like before and everytime she spitts, small amount of white puff-smoke comes out of the pipe. She sounds just like if she is "looking" for the best running rpm, but cant seem to find it. (I have also tried to "turn" the whole magneto when she runs, to se if that did help... but no.) If You understand. Again I have to ask, do You think I have made something wrong with the magneto anyway, when I putted it together after installing the coil?. How "bad" is it if I, lets say, "miss" i teeth or two on the gearwheel? the have to match the "A" or "C", but what happends if I miss one or two, lets say one teeth to the right, or to the left. Its hard to see if the match exact.
Or could it still be someting else? I mean, in the first place, after the first attempt to start after changing the coil and condenser, she did run ok, for lets say... 5-7 min. and then she started to behave like this...
Please Guys, any idea? (more than You so kindley allready have given me!)
Best Regards

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05-15-2008 10:18:32

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 Re: Allis B, strange engine rpm... in reply to pelle, 05-14-2008 08:24:59  
Another thought, try changing the points and condenser. Maybe when the condenser gets hot it starts to discharge irratically.


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05-14-2008 18:48:12

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 Re: Allis B, strange engine rpm... in reply to pelle, 05-14-2008 08:24:59  
Just a few suggestions that you may try. These are just trouble shooting ideas.

I would check the compression on each cylinder, install the original coil, reset the magneto rotor and points per the factory procedure. Make sure all the wires around the coil and points do not have damaged insulation causing a short circuit. You can watch the points if you use the electric start to turn the engine with the magneto cover off. Any stray voltage will show up.

Good luck,


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05-12-2008 18:30:17

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 Re: Allis B, strange engine rpm... in reply to pelle, 05-12-2008 11:31:44  
Pelle, I don't know anything about your plugs, but be sure they are not the resistor type. Good luck. Bob

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