On Monday, October 29, 2018 at 10:04:34 AM UTC-4, wrote:
Just wanted to fish for the procedures and experiences out there on this subject.

Our overhauler and our mechanic both say no towing for 10-18 hours.... We can do this, of course, but we are eager to get back to towing as soon as we can.

Any experience or procedures out there that might get us towing sooner? But we will not compromise long term engine health.... Thanks in advance.

Cheers,
Jim

Depends on who did the overhaul and the test procedures. One of the best in the business was Joe Sylvia in Miami, now long gone. Test procedure after rebuild was to run on a test platform built on the back of an old flatbed truck. Joe would run the engine until the rings were seated, that would indicated a temp drop to normal temp range. At that point the engine was removed from the test stand and installed on the airplane. His advice was to go fly, and yes the CHT and oil temp are the two important factors. This whole process should take about two hours or less of run time. Go TOW !