As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) ENGINE MODIFIED IAW FIREWALL FORWARD CENTRILUBE STC. PREVIOUS EXPERIENCE WITH THIS ENGINE SERIES PROMPTS REGULAR TAPPET INSPECTIONS. TAPPETS INSPECTED AND SPALLING WAS FOUND, EVEN ON THIS STC`D ENGINE. TAPPETS SENT TO FIREWALL FORWARD FOR EXAMINATION, AND ONLY 3 OF THE 12 TAPPETS WERE JUDGED REUSABLE. THIS TAPPET-BODY MANUFACTURING PROCESS HAS BEEN HIGHLY SUSPECT FOR MANY YEARS BY THIS SUBMITTER. (TC NR 20070319006)