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Another have you seen this before

R

redtom

Well-known Member
This is the second time this happened. As with others here I have a barn full of old tractors. Got out a Super C thats been in for a year or two. I always turn off the gas and run em til they die when I put them away. Fired her up and Wiiide open she went! Fiddled around and pulled carb, butterfly apparently had a tiny bit of corrosion in the bore which stuck it shut and when cranking, the governor yanked it open. Broke both screws in the shaft and butterfly went up into intake, thus wide open. Same thing happened to an Allis CA about five years ago. Took carb apart on the super C and potmetal bowl was nearly full of powdered corrosion! Looked like granular fertilizer. I think its from the alcohol. Blew butterfly out through plug hole and fixed carb. I put a drain cock in the 1/8" plug hole in the bowl so I can drain bowl too.
 
I have seen the corrosion you describe, but never enough to snap the butterfly screws. I prefer to add STA-BIL to engines I expect to sit around, my belief is that it's better to have some petroleum moisture in the system than to leave it dry. Your situation is probably why Wisconsin Motor Corp recommends spraying a light oil mixture into the intake with the engine running, right before you shut it off.
 
The powder is just as likly to be from gas as it is ethanol.

No gas will set for a year or 2 and remain liquid when in small quanities.
 
Pay pennys more for fuel, do not use alcohol in an old tractor, use small amount of oil with fuel used before shut down and call us in the a.m. if you have a problem.









5
 
Pay pennys more for fuel, do not use alcohol in an old tractor, use small amount of oil with fuel used before shut down and call us in the a.m. if you have a problem.









5
 
I should specify, the heavy build up of white corrosion was in the bowl itself. the actual corrosion that apparently froze the butterfly was very minimal and really unnoticeable.
 
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