Farmall Cub Forum -- Questions and answers to all of your Cub related issues.
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Once again i am hunting everyone expertise on cubs. My cub was surging at full throttle, after a while it would idle out , but then start surging again when put under a load. I adjust the governor linkage where it attaches to the carb, and it took out the surge but took away the ability to adjust idle thru the throttle lever. Any suggestions would be great and if it something that you may have a diagram to represent the adjustment would be great, if not I will try to dig thru my manuals. Sorry to be a beginner but I am trying to learn on the fly.
Larry 51' Farmall cub
Surging is usually an indication of low or reduced fuel flow - - - and or slight mismatch on governor linkage.
Having read the initial post several times, suggest putting the governor linkage to carburetor back to it's initial position. Then check the fuel flow through the carburetor, main jet for partial blockage, fuel level in carburetor bowl - - - basically make sure the carburetor is up to snuff.
I have an excuse. CRS.
Just a thought, but related to fuel is the gasket between the carb and the manifold. If it's not sealed well, the engine is sucking air in and causing the governor to adjust due to too lean fuel/air mixture.
My 1945 Farmall H makeover
To test the gasket leak , with the engine running , put the nozzle of a propane torch near the gasket surfaces and open the torch valve if you have an air leak the engine will change ie smooth out / rev slightly. This test will work around the intake manifold also.
I started out with nothing and now I only have half of that left !
PS Don't light the torch. Grump
David Dee Mock-Leonard
Nothing is foolproof to a sufficiently talented fool.
Some days it's not worth chewing through the restraints
The torch test works better if you loosen and remove the fan belt from the crankshaft pulley so the air does not blow the propane away. Another possibility would be to cover the front of the radiator to reduce the air flow.
"The Constitution is not an instrument for the government
to restrain the people, it is an instrument for the people to restrain the
government lest it come to dominate our lives and interests." Patrick Henry
I had the same "surging problem" yersterday , +15 Deg.s , snowing and blowing snow , at the higher RPM's , I just figured that was the carb freezing up , with the moist, very cold air it was "ingesting ! A frozen carb would reduce the fuel supply when it was needed more , at the higher RPM's ! The "prop. air crafts" get into the same issues under cold moist conditions !
Just my thoughts, Lee Petrie, Joliet , IL - 9.6 Deg.s outside, right now in the Chicagoland area @ 3:30 PM Monday 1-6-14
7 posts • Page 1 of 1
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