51 A govenor

morris roessler · Jun 12, 2013

My borther has a 1951 a with power block and he replaced the (I will call it a bow spring) that sits on top of govenor and the linkage is hooked to it. I beleive he may have moved the linkage adjustmnet on th rod as now it will wind up way ,way high above the normal operating range at full throtle. Which I am not sure exactly what that is but beleive it to be 1100 to 1200 RPM on that tractor.This is not a very smart qestion to be asking i guess ,but would I shorten or lengthen that linkage adjustment.I know there is a lot of 2 lunger guys on here that know what to do ,so if you can help me out a little it surley will be appreciated . Thanks much... Morris

wilamayb · Jun 12, 2013

With engine not running, push the throttle wide open. Adjust the linkage between the carburetor and carburetor so that it it 1/2 hole short of meeting the hole when both are a max throttle position.

After that has been achieved set the high idle speed with a hand held tachometer on the end of the crankshaft by using the stop bolt on the bottom of the steering column pedestal. High idle speed for an A is 1050 RPM which should translate to 975 rated speed under load.

Mike Aylward · Jun 12, 2013

I believe you meant the rod from the governor to the carburetor. The fast idle speed of an A is 1080 rpm. Also, when setting the throttle rod I set it about 3/4 to a full hole short as it makes them more throttle responsive. Once this rod is set it need never be changed unless something is removed and reinstalled. After this rod is set you then set the fast idle speed at the bolt on the steering pedestal. Mike

wilamayb · Jun 12, 2013

Hey Mike, I did mean carburetor to governor.

Pete in MD · Jun 12, 2013

When your brother changed the flat governor spring he removed the square head set screw and jam nut. The end of the set screw is turned down to a smaller diameter than the screw itself. The small end goes into a blind hole in the verticle shaft coming out of the governor so that the governor arm and flat spring can only be locked to the shaft in the correct position. He might want to check this before adjusting the control or throttle rods.

morris roessler · Jun 12, 2013

It make sense to me now as i think he may have missed the indent in the govener shaft with the square headed bolt and then tried to compensate by changing the linkage.. I will go over there tomorow and check everthing that is on this post and adjust acordingly as per this post. Thanks a ton all who responded.. It was greatly appreciated.... Morris.

Ray Durham · Jun 12, 2013

Would this same procedure apply to my 1945 hand start model A? Thanks...Ray

Mike Aylward · Jun 12, 2013

It sure does, Ray. Mike

BushogPapa · Jun 13, 2013

The shorter the Rod is adjusted, the more sensitive the Governors will get..right to the point that the engine may want to "Gallop" under light loads and not want to idle well..
I need to lengthen the rod on my 630, as it has gotten to the point of Galloping some at idle.I can see the throttle linkage move, as the governor works it constantly at idle..
You may be well-served to allow a few more RPM on your "A", as in the field, they can use it..!
Ron..

51 A govenor

morris roessler

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wilamayb

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Mike Aylward

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wilamayb

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Pete in MD

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morris roessler

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Ray Durham

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Mike Aylward

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BushogPapa

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