As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT ENGINE O/H A USED SERVICEABLE OIL PUMP DRIVEN GEAR WITH BUSHING WAS INSTALLED. THE ENGINE WAS TEST RUN, OIL WAS DRAINED AND FILTER WAS CUT OPEN. NO DISCREPANCIES WERE FOUND. THE OIL PUMP DRIVEN GEAR BUSHING FAILED SOME TIME AFTER TEST RUN AT OUR FACILITY. WE BELIEVE THIS TO BE A FAILURE OF THE BUSHING MATERIAL.