What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
Narrative: the pilot reported that during climb out at around four thousand feet he started experiencing severe engine vibration and noise. He stated that the engine oil pressure and temperature indication was normal but that the RPM indication was very erratic. He said he retarded the throttle position to near idle, turned the aircraft around and successfully returned to the airport. After landing and with the engine at idle he taxied the aircraft off the runway and then shut down the engine. There were no injuries to the occupants as a result of this incident. Subsequent inspection of the engine after removal of a cylinder revealed internal engine failure. The engine had approximately 1050 hours since its last major overhaul and it is not known at this time what caused the failure. The owner will submit a malfunction or defect report after a more detailed inspection of the engine is completed. There was no pilot deviation. This incident is closed.
As the FAA filed it
NARRATIVE: THE PILOT REPORTED THAT DURING CLIMB OUT AT AROUND FOUR THOUSAND FEET HE STARTED EXPERIENCING SEVERE ENGINE VIBRATION AND NOISE. HE STATED THAT THE ENGINE OIL PRESSURE AND TEMPERATURE INDICATION WAS NORMAL BUT THAT THE RPM INDICATION WAS VERY ERRATIC. HE SAID HE RETARDED THE THROTTLE POSITION TO NEAR IDLE, TURNED THE AIRCRAFT AROUND AND SUCCESSFULLY RETURNED TO THE AIRPORT. AFTER LANDING AND WITH THE ENGINE AT IDLE HE TAXIED THE AIRCRAFT OFF THE RUNWAY AND THEN SHUT DOWN THE ENGINE. THERE WERE NO INJURIES TO THE OCCUPANTS AS A RESULT OF THIS INCIDENT. SUBSEQUENT INSPECTION OF THE ENGINE AFTER REMOVAL OF A CYLINDER REVEALED INTERNAL ENGINE FAILURE. THE ENGINE HAD APPROXIMATELY 1050 HOURS SINCE ITS LAST MAJOR OVERHAUL AND IT IS NOT KNOWN AT THIS TIME WHAT CAUSED THE FAILURE. THE OWNER WILL SUBMIT A MALFUNCTION OR DEFECT REPORT AFTER A MORE DETAILED INSPECTION OF THE ENGINE IS COMPLETED. THERE WAS NO PILOT DEVIATION. THIS INCIDENT IS CLOSED.