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Allis Chalmers Discussion Forum

47 B revs up & down

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Author  [Modern View]

07-28-2015 17:47:56

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My B has run great for years but on hot days it will rev up and down and sometimes stall. I think this could be a governor issue. Can anyone explain how the governor works? I checked for vacuum leaks around the manifold. I rebuilt the carb several times. Thanks, Gary

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07-28-2015 18:49:11

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 Re: 47 B revs up & down in reply to Gary47B, 07-28-2015 17:47:56  
Is the anti-surged spring still on it that hooks the the front manifold stud?? If not that is where your problem is

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07-29-2015 03:38:11

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 Re: 47 B revs up & down in reply to old, 07-28-2015 18:49:11  
the spring is in place. You can watch the rod connected to the carb move back and forth with tension on the spring. This makes me think it must be the governor.

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Dick L

07-29-2015 06:28:44

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 Re: 47 B revs up & down in reply to Gary47B, 07-29-2015 03:38:11  
It will not be a governor problem. It shows you governor is working properly. When it does not have enough fuel to maintain your set rpm's the governor is opening up the throttle plate to let more gas. When it gets the gas and the rpm's come up the governor closes the throttle plate to hold the rpm's to your setting and you are not getting enough fuel to keep it at the set rpm's. That then slows the rpm's and governor again opens the throttle plate. That is the way the governor is suppose to work. You will find the problem in the linkage, carburetor or fuel supply from the tank. I am not sure what hot weather has to do with it. First look for binding or rubbing of the linkage. Sometimes it can be found rubbing under the water outlet neck on the head. If it does not do it all the time in most likely in not out of adjustment linkage. It can be floating stuff in the carburetor or fuel delivery system.

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