Incident Overview
During flight, the engine lost partial power and engine oil leaked out, covering the windshield. About 3 miles from the airport, the engine quit completely. The pilot executed a forced landing downwind, during which the aircraft overran the runway, collided with two fences, and nosed over.
Post-Crash Examination
Examination of the engine after the accident revealed that the No. 3 connecting rod had disconnected from the crankshaft. A nut from the No. 3 connecting rod was found in the oil pan with no thread damage. The corresponding rod bolt's threaded portion was protruding through the engine case, also without thread damage. All other engine damage was consistent with secondary damage following the connecting rod separation.
Engine History
The engine had accumulated 47 flight hours since its last major overhaul, at which time the connecting rod bolts were replaced.