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Restoration & Repair Tips Board

Sandblasting / Wire Brushing

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JKC

11-29-2005 18:43:17




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I have read a great deal on sandblasting a tractor in preparation for a new paint job. I have read about NOT sandblasting the entire tractor, due to sand entry into the places you don't want it. What I am not clear on is this: If you have the tractor torn-down completely, including having the cylinders out and crankcase open, can you THEN sandblast the outside of that portion of the tractor, rinsing the whole thing with something like diesel fuel when finished to get the sand out? Same goes for the rear-end..... If you have all rear end components out and the case open, can you THEN sandblast the exterior of the case? IF NOT, is wire brushing the exterior cast parts of the tractor the recommended practice? I look forward to any help you can offer. Thank you.

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Rnicholas

12-02-2005 16:00:24




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 Re: Sandblasting / Wire Brushing in reply to JKC, 11-29-2005 18:43:17  
Here's what I go by--I don't sandblast anything that has internal working mechanisms. That is, if it's a tire rim, wheel weights, etc, I blast away with glee. All else gets the wire brush treatment. I sometimes use acid bath for small parts.



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MMB

11-30-2005 06:38:23




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 Re: Sandblasting / Wire Brushing in reply to JKC, 11-29-2005 18:43:17  
I would have to concur with those that have advised NOT to sandblast. There are items of course that can be done, disassembled tractor frames, tinwork (as long as the blaster has experience with tin), and any other parts that have been totally disassembled (except things like trannys, engines, and differentials). I just helped a friend bring home two JD's that he had blasted and painted. He spend countless hours taping and shielding everything and that darned sand still manages to get everywhere. As mentioned below, it won't remove hardened grease and no matter how clean you think it is after the blasting, you'll find a lot of areas where the sand has been painted over. And don't for a minute think the sand hasn't found it's way into some seals, bearings, and other moving parts. As for disassembling those cases or engines, I would never do it. If you're going that far just to clean the outside, it seems pointless. As for washing down with diesel, that doesn't work that well .... use a power wash with soap and warm water to shed the sand (if you do go that route). Solvents just don't wash off sand that well in my experience. My suggestion is to start scraping and wire brushing. Time consuming yes but once it's done and then degreased and washed, you'll end up with a good starting point for prepping and paint, and you'll never find yourself wondering what's grinding and wearing inside there somewhere.

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john_bud

11-29-2005 20:27:07




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 Re: Sandblasting / Wire Brushing in reply to JKC, 11-29-2005 18:43:17  
JKC,

Well, after you break everything down you still have to degrease it -- all the way down to bare metal/paint/rust. Old grease and muck will stop the sand from doing it's job.

Then you still have to cover up stuff that you don't want sanded. Bearings, bushings, machined surfaces, etc. Multiple coats of duct tape work.

Then you can blast away.

After blasting, I find that there are areas that still need wirebrushing. A 4" brush on an angle grinder works. The wires do break loose on a regular basis. Many are swept up after each use. Some are picked out of jeans, shirt and skin. Safety glasses are a must!

Have fun!

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