Incident Overview
While flying approximately 10 miles southeast of the airport over the ocean, the pilot reported that the engine began to vibrate. In response, the pilot elected to return to the airport. However, a few minutes later, the engine oil pressure dropped to zero, forcing the pilot to ditch the aircraft in the ocean.
Investigation Findings
Post-incident examination revealed that the number 4 connecting rod cap had separated from the connecting rod. This separation occurred due to the failure of one rod cap bolt. No other mechanical issues were identified in the investigation.
Conclusion
The ditching was necessitated by a complete loss of engine oil pressure following the mechanical failure. The aircraft was recovered from the ocean for further inspection.