PROGRESS REPORT
I've got the engine disassembled. Everything came apart pretty easily, except the rivets of course, which had to be drilled out. The crankshaft is knurled on one end and pressed into the flywheel. A 3/16" pin punch can be used to press it out:
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Cleanup of the parts was fairly straightforward. Some parts had light corrosion, and were soaked in vinegar or lacquer thinner, then polished with fine steel wool. Here is an overview of the (non-sheet metal) parts. (I found out that the knurled-base smokestack shown here is not correct for this model, so Rich (RichSteamTx) is swapping it out for the correct one):
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As shown in the "before" pictures above, there was a lot of paint missing from this engine. I used paint stripper to remove what remained:
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And here are the newly-naked sheet metal parts:
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Next up: media blasting and priming...
Paula