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Question:

What happens to a 10HP AC industrial motor when it sits unused for 13 years?

Siemens Motor 132M frame, 1450RPM, weighs 108lbs. Motor sat in a storage bin for 13 years, never wired-up or used.

Answer:

as long as it was kept dry it's fine, bet that baby will do a number on your electricity bill
dust it off, look it over, if it looks fine it should be ok.
Grease in the bearings separates and dries out.
Nothing happens just from sitting. It can get rusty from condensation if it wasn't stored in a good place. If it looks good and the insulation on the wiring isn't brittle or cracked, it's probably ok.
Inside? The centrifugal switch might be kind of sticky, and the contacts might be dirty. But if was kept dry, it should be just fine. Outside? It's toast.

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