As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NOISE HEARD AT IDLE POWER AFTER LANDING THAT SOUNDED LIKE A ROD KNOCK (OR A WELL RUNNING RADIAL ENG). DECIDED TO DISASSEMBLE ENGINE FOR OVERHAUL. FOUND TWO TEETH MISSING FROM CRANK GEAR P/N 536421 AND ONE TOOTH MISSING AND ANOTHER TOOTH CRACKED ON CAM GEAR P/N 535660. TEETH WERE FOUND IN OIL PAN. SUSPECT GEARS WERE STRESSED FROM SUDDEN STOPPAGE IN 1972. ENG TT SINCE CONT REMAN: 2,615 HRS.