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Allis chalmers B initial startup problem


 
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rosedale123
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PostPosted: Sun Apr 12, 2015 12:44 pm    Post subject: Allis chalmers B initial startup problem Reply to specific post Reply with quote

took the B for a spin down the road. It ran well but I noticed gong up a hill the governor did not open up -- it just kept loosing speed. SHould I expect the governor to open up to attempt to maintain speed? Another thing I notice ( although it may be normal) is when throttling it up using the throttle lever, thru most of the quadrant is is one speed and then jumps to a higher rpm . Normal?

If there is something wrong , where would you start? Linkage? governor spring? would you think something is worn and needs replaced?

thanks for any and all help!
 
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rosedale123
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PostPosted: Sun Apr 12, 2015 12:48 pm    Post subject: Re: Allis chalmers B initial startup problem Reply to specific post Reply with quote

not start up issue - govenor issue
 
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old
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PostPosted: Sun Apr 12, 2015 12:52 pm    Post subject: Re: Allis chalmers B initial startup problem Reply to specific post Reply with quote

Weak springs or linkage binding some place. Engine should speed up all the way threw the throttle up not just one short area. Could be caused by the carb/gov linkage binding some place or bad/weak springs. Set the throttle to idle then try to open it up at the carb and see if the gov tries to slow it back down. If it does not then you have a problem in the gov.
 
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Dick L
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PostPosted: Sun Apr 12, 2015 1:35 pm    Post subject: Re: Allis chalmers B initial startup problem Reply to specific post Reply with quote

First check to see if the cross over arm is rubbing under the heads water neck. Then as old said check the governor by bring the rpm's by hand gripping the linkage just in front of the carburetor. If the governor is working properly it should resist your trying to increase the rpm's.
 
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rosedale123
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PostPosted: Sun Apr 12, 2015 4:37 pm    Post subject: Re: Allis chalmers B initial startup problem Reply to specific post Reply with quote

Tried your idea an the gov does seem to offer resistance when trying to increase rpm. I watched the action of the linkage when I pushed the throttle lever forward and it gets to one spot and the plate ( if that is the right term- spring on one end thing) and the linkage "jumps". that jumping action is what makes the throttle all the sudden increase. I also noticed that the spring does not have the bullet inside it - does that matter. I coud'nt dig too deep as it was getting dark. Could the plate have a worn pivot point? there is a oil line attached to the middle if that matters.

So would you be thinking linkage? wear? spring?

sorry for all the questions and certainly thanks for the advice
 
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steve(ill)
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PostPosted: Sun Apr 12, 2015 5:59 pm    Post subject: Re: Allis chalmers B initial startup problem Reply to specific post Reply with quote

pull the cotter pin and pin out of the link at the front left corner of the motor, above the generator.. Put your throttle lever at full throttle and make sure the carburetor lever is moving all the way to "butterfly open"......... pull your governor arm at the left front corner of the motor backward and make sure it does not drag the thermostat housing.. Pull all the way back and see if it aligns to the carburetor link that you removed. The holes should line up to put the pin back in.. If not, you need to bend the rod that goes from the governor across the backside of the motor in front of the thermostat housing .......... get the links to align before you reinstall the pin.
 
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Dick L
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PostPosted: Sun Apr 12, 2015 7:33 pm    Post subject: Re: Allis chalmers B initial startup problem Reply to specific post Reply with quote

Is this where it seems to be binding/catching??



If you remove the oil line the assembly will lift up and off with the linkage and spring removed. I would suspect that the pin is loose in the governor cover. If that is the case it can be cleaned free of oil and JB Weld make it solid again. Again, make sure the cross over arm is not catching on the head. Your close to finding it. The pin inside the spring is only a positive stop. It would not cause a sticking problem.
 
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Plant Doc
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PostPosted: Mon Apr 13, 2015 4:04 am    Post subject: Re: Allis chalmers B initial startup problem Reply to specific post Reply with quote

Look at the carb shaft that goes from the Cross over shaft to the carb butterfly. There should be a spring attached to a manifold bolt and to this shaft. If you do not have this spring get one. Without seeing your tractor I have to guess at what this problem may be so my first guess would be this spring. If I remember correctly it is called a surge spring. Even though it is called surge spring it will make your governor more responsive.
 
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Dick L
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PostPosted: Mon Apr 13, 2015 7:52 am    Post subject: Re: Allis chalmers B initial startup problem Reply to specific post Reply with quote

Actually the surge spring is a damper spring to hold the linkage steady. It hooks almost straight up from the linkage onto a manifold stud.
 
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willie in mn
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PostPosted: Mon Apr 13, 2015 9:33 am    Post subject: Re: Allis chalmers B initial startup problem Reply to specific post Reply with quote

Quick & dirty test. Had a WD a few years ago that acted the same.
Tie a string to the throttle rod, run it to where you can reach it,& go for a drive. When it bogs down, tug on the string. If it revs up, there is a governor problem.
On my WD, it didn't want to pull a short hill in third gear. After freeing the stuck governor weights, I could start up the hill idling in fourth, advance throttle, & it would take right off, leaving spin marks in the gravel.
WJ
 
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rosedale123
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PostPosted: Mon Apr 13, 2015 4:11 pm    Post subject: Re: Allis chalmers B initial startup problem Reply to specific post Reply with quote

you nailed it...the linkage was rubbing the bottom of the head. like a dufus i did not listen well enough the first time :)

again, thanks for the help
 
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