Incident Sequence
During a pleasure cross-country flight, the pilot performed a precautionary landing due to smoke in the cockpit and a low oil pressure indication. After landing, examination revealed a broken oil line to the oil pressure gauge. Repairs were completed, and the pilot took off. Approximately 10 minutes into the flight, the engine experienced an overspeed. A few minutes later, the pilot heard a loud bang, and oil began to cover the windshield. The pilot executed an emergency landing on a road. During the landing roll, the aircraft collided with a pole.
Examination Findings
Inspection of the engine found that the No. 4 connecting rod had failed and punctured the crankcase. Further examination of the bearing showed evidence of high-temperature scorching.