As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENGINE DISASSEMBLED DUE TO ROTOR BLADE STRIKE. FOUND SEVERAL DEEP RINGS WORN IN ROCKER COVERS WHERE ROCKER SHAFTS RIDE. (NOT CAUSED BY ACCIDENT.) SUBMITTER STATED THIS PROBLEM HAS BEEN CORRECTED ON OTHER TYPES OF LYCOMINGS BY INSTALLATION OF PLASTIC THRUST BUTTONS, BUT NOT ON THIS TYPE.