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Allis Chalmers Discussion Forum
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1946 AC Won't stay running

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Old Stage

10-18-2006 05:59:14




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My 1946 won't stay running. The carb and bowl is clean but when I increase the throttle the engine dies.
Does the oil have anything to do with this?
Is this a vacuum system?
Can anybody help?




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Texas Denny

10-18-2006 12:51:57




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 Re: 1946 AC Won't stay running in reply to Old Stage, 10-18-2006 05:59:14  
It does sound like a fuel problem to me. There is a drain on the bottom of the carb. Remove that plug and see that you get a strong steady flow of gas. If you don't there is a problem within the carb, the line or the tank. I've usually found such a problem being crude in the tank that prevents the flow of gas. Not being able to run a fast idle or to pull could be that the ventury in the carb throat is missing. Or it could be the power jet circuit being plugged - tough to clean.

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85_Ranger4x4

10-18-2006 10:25:38




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 Re: 1946 AC Won't stay running in reply to Old Stage, 10-18-2006 05:59:14  
No, but it is a common A-C problem. We have both a B and C and they both take on water in a good rain. The easiest way to fix it is to keep it inside, I have thought of tapping the manifold and putting in a pipe like a farmall.



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old

10-18-2006 08:28:34




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 Re: 1946 AC Won't stay running in reply to Old Stage, 10-18-2006 05:59:14  
Need more info since you didn't say what tractor you have. In 1946 they made 3 or 4 differant models of tractor so to help we need the model of the tractor



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Old stage

10-18-2006 09:25:53




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 Re: 1946 AC Won't stay running in reply to old, 10-18-2006 08:28:34  
This tractor is a model B. It has 3 speeds and basically is a motor and an transmission. The tractor has a 6 volt system that is positively grounded?



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old

10-18-2006 09:47:56




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 Re: 1946 AC Won't stay running in reply to Old stage, 10-18-2006 09:25:53  
By the way the oil system will have nothing to do with that problem. Now if your running the wrong oil or running it to low on oil then you can/will have other problems. Also does chokeing it help or hurt the way it runs



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Old Stage

10-18-2006 09:55:20




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 Re: 1946 AC Won't stay running in reply to old, 10-18-2006 09:47:56  
When I use the choke the engine sometime catches itself and doesn't turn off. However this isn't always the case. I almost always needs the choke to start the engine.



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old

10-18-2006 10:02:03




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 Re: 1946 AC Won't stay running in reply to Old Stage, 10-18-2006 09:55:20  
Sounds like you need to get into that carb and clean it out some. I just did that yesterday on an Allis C I have, same engine/carb as your B. Those carbs can be a pain in the butt because of the nonadjustable main jet



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old

10-18-2006 09:43:45




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 Re: 1946 AC Won't stay running in reply to Old stage, 10-18-2006 09:25:53  
Yep should be + ground if 6 volts. Also the carb is a nonadjustable main jet type carb and they can cause problems becuase of a little junk in the carb BTDT. I would say you need to open up the carb and clean it out real good. Also make sure you have a nice brite blue spark. Either one can cause the problem your haveing

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Old Stage

10-19-2006 07:55:40




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 Re: 1946 AC Won't stay running in reply to old, 10-18-2006 09:43:45  
I made a mistake there wasn't water in the exhaust stack but the smaller pipe next to it. The one that is connected to the carborator. Maybe some sort of breather? Should there be water at the bottom of this?



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old

10-19-2006 08:49:00




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 Re: 1946 AC Won't stay running in reply to Old Stage, 10-19-2006 07:55:40  
Well if your talking about what I think your talking about, then NO, thats the air cleaner and if it has water in it that could be part of your problem. The cup on it needs to be removed, cleaned and then filled with motor oil to the line. Water in it can be sucked up into the carb and then cause all sorts of funny stuff to happen

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Old Stage

10-18-2006 10:01:45




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 Re: 1946 AC Won't stay running in reply to old, 10-18-2006 09:43:45  
I appreciate your help. I have already cleaned the carb but haven'y looked at the plugs. Also could the distributor cap have anything to do with it?



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Old Stage

10-18-2006 10:16:09




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 Re: 1946 AC Won't stay running in reply to Old Stage, 10-18-2006 10:01:45  
One last thing. About a week ago the tractor actually ran for about an hour and then coughed and died. We haven't been able to keep it going for any long period since. Also should there be water in the muffler stack?



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old

10-18-2006 12:03:16




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 Re: 1946 AC Won't stay running in reply to Old Stage, 10-18-2006 10:16:09  
Nope it shouldn't have water in the exhaust. If it does you may have a head gasket bad and or a cracked block or head, or a sleeve seal that has gone bad. I t wouldn't hurt to do a full tune up on it just to make sure your problems are there. A bad condenser will let it run a minute or 2 then dies as will a bad ignition switch

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Old Stage

10-19-2006 08:35:29




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 Re: 1946 AC Won't stay running in reply to old, 10-18-2006 12:03:16  
I made a mistake the muffler didn't have water in it but the pipe next to it. The one that is attached to the carburator. Is this a oil breather or something?

Also what kind of oil and how much should this engine have? I want to do an oil change.



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old

10-19-2006 08:52:23




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 Re: 1946 AC Won't stay running in reply to Old Stage, 10-19-2006 08:35:29  
May self I run valvoline oil in all my engines. This time of year I would use a 30W oil in it. It takes 4 or 5 qts of oil. I think its 4 qts if you don't change the filter and 5 if you do. I always change the filter. Also be sure to get the correct filter or you will not have oil preassure.

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Stuart H

11-27-2006 13:56:53




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 Re: 1946 AC Won't stay running in reply to old, 10-19-2006 08:52:23  
Hi,

What"s the correct filter? My C has a NAPA filter on it, but I don"t remember the number. On the original gauge, it usually reads toward teh low line for oil pressure.

Thanks,


Stuart



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