As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING OIL CHANGE AND C/W TEXTRON LYCOMING MANDATORY SB 518C, FOUND THE VERNATHERM CRIMP NUT WAS EXTREMELY LOOSE. THE ENGINE WAS OVERHAULED AT 1,642 HOURS AND THIS VALVE WAS NOT REPLACED AS RECOMMENDED BY THE MANUFACTURER. SUBMITTER SUGGESTS SB 518C BE ACCOMPLISHED AT NEXT OIL CHANGE AND ALL LYCOMING VERNATHERM VALVES REPLACED AT OVERHAUL.