Charles, can a mechanic split an overhaul this way, doing the top at a later date, and then sign off the engine as overhauled?
Not that I know of. The engine manufacturer defines what an overhaul consists of, and Continental says that the required replacement of certain parts and overhaul of certain accessories, among other things makes it an overhaul.
http://www.tcmlink.com/pdf2/SB97-6.pdfYou would have to do all of the work at the same time and sign it off that way, otherwise you have a bits and pieces repair of the engine (IRAN, inspect and repair as necessary). Not saying that is a bad thing, just that it is NOT an overhaul.
Charles