1947 Super A

Anonymous-0 · Jun 7, 2009

Need the name and location of a good place to send my Super A governor to get rebuilt. Engine has a surge that I cant adjust out by the manual. The manual refers to a "bumper screw adjustment. I removed this assembly but it was not obvious to me how to make the little screw longer or shorter. Is there any other way to eliminate the surge? I am pretty sure I will need to have my governor rebuilt or find a parted out one that works OK. Suggestions welcome.

Bob · Jun 7, 2009

There's an "acorn nut" and a "lock nut" on the bumper spring adjusting screw. I suspect your's came out as a unit, and you didn't realize it separates into 3 pieces?

Put a wrench on the acorn nut AND a wrench on the locknut and loosen them from each other and take off the acorn nut, exposing the outer end of the adjusting screw.

The little spring sticking out of the adjusting screw IS present, right?

All that being said, often a "gallop" is due to a carburetor problem.

Anonymous-0 · Jun 7, 2009

Yes you have been very helpful. I separated the acorn nut assembly as you suggested and it does have 3 pieces. I understand now most everything except how the little spring damps out any surging the governor might be doing when the engine is under load? 2 more questions if I may? How far should the end of the little spring stick up into the governor housing? What would happen if I put it all back together again and left the little spring out completely?

Bob · Jun 7, 2009

The adjustment is by trial and error... just enough so the internal lever contacts the spring to dampen surging.

I understand the spring was omitted in similar engines in succeeding tractor models.

Perhaps small carburetor or linkage adjustments were made, so it was no longer required. Beyond that I don't know.

ScottyHOMeY · Jun 7, 2009

That spring needs to be there, Garry. A governor is nothing more than a mechanism using springs to balance inputs and resistance from various places with the centripetal force of a couple of weights spinning around a shaft. They are a a step removed from, but still very closely related to the old flyball governors on steam engines. Primitive, but effective.

Trust me, there are no spare parts on these old girls. If that spring wasn't needed, it wouldn't be there.

mattofvinings · Jun 7, 2009

Just in case the governor rebuild doesn't take away the rolling idle (I think that's what I read)...this can also hint at some kind of vacuum leak or unintended EGR.

One way to think about this is that the idle jet can't make up the air/fuel ratio correctly and the engine rpm starts to drop. The governor opens the throttle and the main jet gets more involved which masks the problem and then the governor starts to close the throttle again...repeat indefinitely.

1947 Super A

Anonymous-0

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Bob

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Anonymous-0

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Bob

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ScottyHOMeY

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mattofvinings

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