Had a Marvel that sat untouched outside for 35+ documented years.
For all intentional purposes it should have gone on the scrap pile. (actually it was on a scrap pile when I got it)
Could not even get 1 screw to turn, broke 2 trying.
Put it in a big pot outside on a hotplate and cooked at a slow boil for an hour in a water and rad cleaning solution (oxalic acid)
Pulled it out and rinsed it in a baking soda and water bath to neutralize the acid then rinsed in clean water.
It cleaned up great, all the screws came out like they were put in yesterday.
The two I broke the heads off of unscrewed with a pair of pliers and no effort.
I was dealing with brass, steel and aluminum and contrary to what others say there was no problem with the solution eating anything away, granted this carb was built well to begin with.
Proceed at your own risk, just sharing what worked for me.
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Today's Featured Article - Product Review: Lead Substitutes - by Mike Schordine. Lead was oriinally added to gasoline as an upper cylinder lubricant. It lubes the valves and seats. If you rebuild the motor, you could use hardened seats and valves, and unleaded fuel. But if your old tractor runs good, a simple lead substitute added to the gas is a perfectly reasonable solution. And, if you are like me, your tractor is under cover, but it sits outside. So with every temperature change, the humidity in the air collects in the fuel tank, in the form of water.
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For sale Farmall super A tractor is complete and has just been setting for awhile,it was running when pulled out of the barn,shouldn’t take to much to get it going asking 1100.00
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