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Farmall H

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AlbertS

01-23-2006 02:12:53

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I've got what I assume to be a 1944 H. It was my grandpas tractor since new, and he gave it to me shortly before he passed away. I did some minor work on the engine (new pistons, sleeves, turned the crank, had the head looked over etc.) but i am by no means a mechanic. My question is when it idles it run uneven. Sounds like the throttle is on a roller coaster. Why does it do that? and how do I fix it? Thank you guys.

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Wayne Swenson

01-23-2006 06:24:44

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Re: Farmall H in reply to AlbertS, 01-23-2006 02:12:53

Loosen the 2 screws that are holding the governor tube & gently tap it so it "centers" itself then tighten the screws. Remove the top cover on the governor (has the pipe going to the top of the engine) and check governor to carburetor synchronization. With the throttle wide open, the clevis pin should just slip into the governor connecting rod that is in the tube. Adjust the clevis height if needed & lock the nut. You will need small fingers & a right angle needle nose pliers to make the job easier.

With the engine warm & running at wide open throttle (WOT), turn high speed mixture screw in until the engine begins to starve for fuel. Then turn the screw out until the engine begins to blubber. Now find the "sweet spot" in between the two settings. If you are working the engine (plowing, etc.), then the high speed screw needs to be turned out 1 turn or more beyond the "sweet spot" to be sure the engine isn"t starving for fuel and can develop its rated power.

The same procedure can be followed for idle mixture with the addition of the ldle stop screw to set the low speed RPM.
On the "H" carb, the idle mixture screw is an air adjusting screw so turning in will richen the mixture and out will lean the mixture.
Aren"t carbs fun!!

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Brownie 45

01-23-2006 05:55:03

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Re: Farmall H in reply to AlbertS, 01-23-2006 02:12:53

Our SMTA did this after a carb overhaul, and it was the " tube" between the carb and the governor that needed adjusted[ slotted - large holes]. The throttle shaft was binding inside the tube. Worth a check.

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riverbend

01-23-2006 04:57:34

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Re: Farmall H in reply to AlbertS, 01-23-2006 02:12:53

The hunting can be caused by carb adjustment. It can also be loose parts in the governor. If you take the side cover off, it is easy to check. All the bearings, weights, pivots, joints, etc. should move freely, but not have any oval holes, tight spots, etc.

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Jayw

01-23-2006 04:49:46

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Re: Farmall H in reply to AlbertS, 01-23-2006 02:12:53

Albert
I have a 41 H when I started on it it did the same thing sort of searching. Iwas told it was distributer. But after rebuilding the carb and several atempts at adjusting . I got the searching too stop. I would start with the carb . You can do a quick check too see if there is a lot of play in the distributor.

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