As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING NEWLY OVERHAULED ENGINE INSTALLATION AN OIL LEAK WAS DISCOVERED. WHEN BREAK-IN OIL WAS ADDED TO OIL SUMP FOR INITIAL ENGINE RUN, OIL WAS OBSERVED LEAKING ONTO NOSE TIRE. FURTHER EXAMINATION REVEALED OIL LEAK WAS ORIGINATING FROM LEFT REAR OF ENGINE WHERE THE OIL SUMP AND ACCESSORY HOUSING MATE TOGETHER. CAUSE OF LEAK WAS IMPROPER SEALING OF OIL SUMP AND ACCESSORY HOUSING DURING ASSEMBLY.