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Farmall & IHC Tractors Discussion Board

Re: Farmall M Runs When Chocked - Need Help

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Posted by wayne in mn on November 22, 2009 at 19:06:24 from (

In Reply to: Farmall M Runs When Chocked - Need Help posted by Sparetime on November 22, 2009 at 15:46:17:

Your throttle is backwards; I would suggest that the bellcrank is hooked up backwards. Look between the exhaust pipe & the valve cover; the rod from the operator's platform attaches to the lower hole and the governor rod is in the upper hole.
Note: type in "Farmall M" in the search box on
the Case-IH page. Quotation marks not needed. Select 1939 M, select carbureted engine, select governor controls for a parts layout.


Note: #1, 2, & 3 adjustments are done with the engine not running when the carburetor has been removed & replaced.
1. Loosen the 2 screws that are holding the governor tube to the governor housing. The clamp is slotted to allow adjustment. Tighten the tube-to-carburetor screws; gently tap the tube so it "centers" itself, & then tighten the tube-to-governor screws.
2. Remove the top cover on the governor housing (has the pipe going to the cylinder head) and check governor to carburetor synchronization. Remove the cotter pin so the clevis pin can be removed. With the operator's throttle lever set wide open and rotating the horizontal rod upward to wide open throttle position, the clevis pin should just slip into the rod that is in the tube. This horizontal rod should rotate freely allowing the carburetor throttle plate to move from idle to wide open. Adjust the clevis height if needed & lock the nut. You may need small fingers & right-angle needle nose pliers to make the job easier. Return throttle lever to idle. Re-attach the top cover.
3. Carb adjustment: idle air screw is set at 1˝ turn out to start with; high speed mixture screw is 2˝ or 3 turns out.
4. With the engine warm & running at wide open throttle (WOT), turn high speed mixture screw (on the bottom facing down to the rear) 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 ˝ turn or more beyond the "sweet spot" to be sure the engine isn't starving for fuel and can develop its rated power.
5. The same procedure can be followed for idle air mixture with the addition of setting the idle stop screw (just to the rear of the governor shaft tube) to adjust the low speed RPM.
On the "H"& “M” carb, the idle air mixture screw (faces to the front just below the idle stop screw) is an air adjusting screw so turning in will richen the mixture and out will lean the mixture.
Repeat the carburetor adjustment procedure again to make sure “all is well”.


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