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CNKS
02-25-2005 18:52:58
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Re: Sandblasting? in reply to spray004, 02-25-2005 08:20:35
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As is the usual answer to this often asked question, it depends on who answers. To do a good job, the tractor has to be disassembled. You can sandblast the parts you take off, including the wheels, rims, front bolster, brake and clutch pedals etc. You can do the sheet metal if you are careful. Any place that you can stay away from bearings and seals. Tape any exposed machined surfaces and all openings. Oven cleaner, lye gravy, paint stripper, whatever, on the chassis. What I seldom see mentioned is that on the cast, most people say use oven cleaner, lye gravy, etc, pressure wash and paint. The cast is no different than any other surface. It's rough surface does not mean it is ready to paint. It needs to be etched. This can be done to a degree with the angle grinder Allan(NE) shows, but for the odd shaped areas you will also need various other brushes on a drill. A Needle scaler is also helpful for the tight places. In any case, one operation with any tool will not do the whole job, it is quite simply a LOT of work using mutiple tools to do it right. The dried grease is no problem compared to removing all the paint and rust. The electrolysis may work for small parts, (IMO they still need to be etched), but I wouldn't put an assembled engine in there. Perhaps if you are overhauling it anyway, and have an empty block. Remember that electrolysis does not prevent rust, it causes it, so it has to be dried immediately. And you still need to etch the metal before painting. The etching can be done with rust preventative phosphoric acid products such as Picklex 20; I do not use rust converters such as POR 15, as I much prefer to paint clean, bare metal. Any phosphoric acid product will enter the pores of the cast, I'm not saying you necessarily have to remove it, but I use soap and water, followed by a repeated applications of a an automotive wax and grease remover, (I don't give it a chance to rust) until the rags come back clean. There simply is no easy way to do it.
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