As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) TIP OF ROCKER ARM THAT PUSH ROD PUSHES ON ARM TO DEPRESS EXHAUST VALVE BROKE OFF. THIS TYPE OF BREAK IS THE FIRST ONE I HAVE SEEN IN THE 31 YEARS THAT I HAVE WORKED WITH TYPE OF ENGINE. THE CYLINDER WAS NEW WITH ONLY A TOTAL OF 593 HOURS ON UNIT. REMOVED PART FROM CYLINDER FOR EVALUATION IF REQUESTED. AIRCRAFT WAS FORCED TO MAKE AN EMERGENCY LANDING ON WATER. AIRCRAFT IS FLOAT EQUIPPED. (X)