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Allis Chalmers Discussion Forum

Maximum RPM's for a Model B

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Tom in IL

07-24-2009 21:00:51

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I posted a message awhile back concerning what the maximum RPM's on a B are. I had an analog tachometer and could only get 900 RPMs. I checked everything on the tach/wiring and it appears to be fine. I was able to get 1400 RPMs by pushing the throttle link that is near the carburetor. However, I cannot get the motor to that level using the normal throttle on the stearing column. Should I be able to get more from the throttle lever on the column, or do I risk overreving the motor. Thanks again for the help.


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Tom in IL

07-30-2009 18:16:44

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 Re: Maximum RPM's for a Model B in reply to Tom in IL, 07-24-2009 21:00:51  

Thanks so much for the help! I will try those out.


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07-25-2009 20:38:00

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 Re: Maximum RPM's for a Model B in reply to Tom in IL, 07-24-2009 21:00:51  
could be as simple as the little set screw on the hand lever has slipped and let the rod to the governor slip at the handle. can you push the handle past the last V notch on the quadrant and get more speed? if so, loosen the set screw and lengthen the rod. If that is not it, go to the left front side of the motor and take the carburetor rod off the arm behind the radiator. Put the throttle lever at wide open, then pull the carburetor rod wide open, then see if the carb rod lines up with the hole in the cross arm. If not, bend the cross arm. Make sure it dont hit the thermostat housing or the belt pulley. You should have to pull the carb rod tight and still lack about 1/16 inch of getting the rod back into the arm hole. THen insall and put the cotter pin back in.

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07-25-2009 07:08:59

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 Re: Maximum RPM's for a Model B in reply to Tom in IL, 07-24-2009 21:00:51  
I would guess you have one of two problems. Maybe three or a combination of all. The cross over arm out of adjustment. The governor spring weak. The main jet orifice plugged or damaged. Probly not the main jet but you should get more than 1400 rpm's by hand at the carb. I did have a low rpm B once that I drilled out the main jet and put in a larger Ventura. Might have been a carb for a combine or something like that.
First make sure the cross over arm is properly adjusted and it has the proper spring before getting into the carb. I just put a rebuilt carb and throttle linkage on a C from the carb to the cross over arm and see it needs adjustment. I will not be able to get to it today but will take some pictures as I set it up in a day or two that I can post.

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Gary B

07-24-2009 21:29:49

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 Re: Maximum RPM's for a Model B in reply to Tom in IL, 07-24-2009 21:00:51  
Make sure the tach is set for a 4 cyl engine. It might be showing half the RPMs.

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