What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
(-23) PIC reported smoke in the cabin and engine power loss in flight. Pilot diverted his route of flight to land at the nearest suitable airport which was Fairview Airport, Landrum, SC (33A). Due to the heavy amount of smoke in the cabin his approach to land was too high and too fast, he elected to land long and did not have enough runway remaining to stop in the hard surface. He departed the hard surface and came to a stop approximately 100 yards in the grass over-run causing minor damage to the aircraft. Further inspection by an FAA rated mechanic disclosed that an engine valve broke loose causing the piston to fail and allowed engine oil to be dumped into the engine exhaust system.
As the FAA filed it
(-23) PIC REPORTED SMOKE IN THE CABIN AND ENGINE POWER LOSS IN FLIGHT. PILOT DIVERTED HIS ROUTE OF FLIGHT TO LAND AT THE NEAREST SUITABLE AIRPORT WHICH WAS FAIRVIEW AIRPORT, LANDRUM, SC (33A). DUE TO THE HEAVY AMOUNT OF SMOKE IN THE CABIN HIS APPROACH TO LAND WAS TOO HIGH AND TOO FAST, HE ELECTED TO LAND LONG AND DID NOT HAVE ENOUGH RUNWAY REMAINING TO STOP IN THE HARD SURFACE. HE DEPARTED THE HARD SURFACE AND CAME TO A STOP APPROXIMATELY 100 YARDS IN THE GRASS OVER-RUN CAUSING MINOR DAMAGE TO THE AIRCRAFT. FURTHER INSPECTION BY AN FAA RATED MECHANIC DISCLOSED THAT AN ENGINE VALVE BROKE LOOSE CAUSING THE PISTON TO FAIL AND ALLOWED ENGINE OIL TO BE DUMPED INTO THE ENGINE EXHAUST SYSTEM.