Al, Bob Huntress and I are all on pretty much the same page.
Whether you choose to do as I did, blasting before any disassembly for mechanical work, knowing that I would have every piece of that tractor apart and cleaned/fixed/replaced, before putting it back together, or go as Al describes and disassemble first, then clean (blast if necessary and then reclean) every part or assembly, you will wind up with a clean tractor. It will depend on what mechanical work you plan on/the tractor needs.
Your shop can blast or otherwise clean it up as a whole or in sections as they tear it down but, as Bob points out, grit from blasting with abrasives after reassembly will most assuredly get into something, and you don't want to ruin good work.
Just as a quick example, I helped a fellow with the clutch on an M that he had paid for as having been restored. Crawling and groping around up in the belly of the tractor to get at the clutch, I found everything covered with a fine grit. I couldn't decide if it was broken sand or glass bead, but it was on everything up in there. Best guess is that it got in around the piping for the hydraulics where it passed thorugh from the belly pump to the outside. It wasn't pretty in there.
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Today's Featured Article - Women and Tractors - Tractor Engine Repair - by Teri Burkholder. One of the great things about working on a tractor engine with your other half is that you know what he is thinking of at all times and can anticipate his every move and his next thought of what he will do. With Ben, anyway, I can tell! He'll be busy working and I’m handing him tools and he says, "give me that..." and I’ve already got it in his hand or "hand me that....."and I’ve got the portable light right where he needed it placed to see. "Run in the house and get me a...."as I open th
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