Posted by Zachary Hoyt on December 21, 2012 at 09:02:03 from (173.84.189.49):
I have developed a leak on the top of the carburetor on my Farmall 300 where the gas line adapter screws into the casting. The casting is cracked in two places (at 11 and 3 o'clock) to the full depth of the threads where the brass looking fitting screws in. I found this out when I tried to tighten the fitting and found that it would not tighten. The bowl of the carb was cracked from water freezing in it before I got the tractor and a very kind forum member sent me a good bowl. The carb is in good shape otherwise and I would like to know if there is any kind of hardening sealer that I can use to repair the casting and secure the adapter that will be gas proof. I know epoxy and JB weld are possible, but I am not sure how the gas would affect them or if there is something else I should try. There is also a mystery screw in a passage that comes into the area where the screen would be if I had one at a 45 degree angle. It is not adjustable when the carb is mounted on the tractor because the head is aimed back at the block. I did not see it mentioned in the manual and I am wondering if I will do any harm by blocking the passage which will probably happen if I am putting any kind of goop in there. Any advice will be much appreciated. Zach
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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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