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Farmall & IHC Tractors Discussion Forum
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Farmall M Governor to Carb

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Trent Couch

01-18-2019 18:55:26




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I finished rebuilding the Governor with new bearings and bushings and rebuilt my carb I was attempting to adjust the Governor to get the carb to Governor connection right from the book and the pin that slides in where the vent tube is on top of the Governor slides In freely at wide open throttle and low throttle. I got the bottom bowl of the carb off looking at the throttle plate opening and closing and I noticed that the throttle plate is almost closed at low throttle and at wide open is completely open however it changes from close to wide open around 1/4-1/2 throttle. To me it seems that the throttle plate inside the carb should open slowly as I open the throttle more and more instead of all at once between 1/4 to 1/2 throttle. I re-read the book over and over maybe I知 missing something is this normal?

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Janicholson

01-18-2019 19:52:31




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 Re: Farmall M Governor to Carb in reply to Trent Couch, 01-18-2019 18:55:26  
Rustred is correct, The motion of the weights control the actual opening. At full throttle with no load (called High Idle) the carb plate will be maybe 1/4 open. As soon as a load is applied slowing the engine a little, the governor opens the throttle plate to keep it stable in rpm. At some point the rpm, and wide open throttle are both matched. More load reduces the engine rpm, but the throttle is already open. Too much of this and the engine lugs down. Jim

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Trent Couch

01-18-2019 20:41:23




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 Re: Farmall M Governor to Carb in reply to Janicholson, 01-18-2019 19:52:31  
Thank you both you guys are great!



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rustred

01-18-2019 19:18:45




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 Re: Farmall M Governor to Carb in reply to Trent Couch, 01-18-2019 18:55:26  
that is normal with out engine running, because the governor controls the opening of the throttle plate when engine is running.



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used red mn

01-19-2019 11:11:27




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 Re: Farmall M Governor to Carb in reply to rustred, 01-18-2019 19:18:45  
I値l add this and I知 not sure it will make any sense. The throttle linkage from the throttle lever pulls against the spring in the governor. In a running engine the centrifugal force of the spinning governor weights is reacting to tension and stretch the spring. Since the engine and governor are not spinning the throttle simply flips wide open because there is no reacting force. This does in fact prove the mechanical connection between the governor and carb is free and working properly. Nothing against your thoroughness but I would say very few folks ever go to the extent of checking this operation.

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