Posted by sgtbull on September 20, 2012 at 06:40:43 from (163.191.228.254):
In Reply to: Bead blasting carb? posted by IAtractorKid on September 19, 2012 at 18:06:57:
I"ve been sandblasting carbs for close to 20 yrs. I have no idea how many I"ve done, but its been a lot. I use white silica sand that has been used 3 or 4 times and is nearly a powder. It is much less aggressive that way, so I don"t run the risk of enlarging an orifice. Sand or bead blasting does an excellent job on rusty carbs. Since most, but not all carbs are cast iron on these old tractors, there is always a rust issue, and carb cleaner will not remove rust. I"ve done DLTX carbs, M.S. Carbs, Carters, Zeniths, IHC, Tillotsons, and many other brands with no problems. As was said though, TOTAL disassembly is a must prior to blasting. I follow up all carb cleanings with Zinc Phosphate coating inside and out, (available at most auto refinisher supply stores) which drastically slows down rusting. I would not recommend sand on potmetal or aluminum carbs. I've not tried baking soda on those, but whatever you use, it must be far less aggressive as those metals would erode quickly.
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