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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