As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE PERFORMING COMPRESSION TEST, DISCOVERED ENGINE WOULD LOCK-UP WHEN ROTATED BACKWARDS. TROUBLESHOOTING REVEALED STARTER ADAPTER WAS CAUSE OF PROBLEM. FURTHER INSPECTION OF ADAPTER SHOWED ACCUMULATION OF RUST AT STARTER MOUNTING PAD. THIS WAS SECOND NEWLY OVERHAULED ENGINE FOUND WITH THIS PROBLEM. ADAPTER WAS REPLACED WITH NO FURTHER PROBLEMS.