Incident Overview
A flight instructor with 2,292 hours of flight experience reported that the engine lost power shortly after takeoff. The instructor initiated a forced landing to a field. During the landing roll, the left wing of the airplane impacted a tree, after which the airplane came to rest upright.
Engine Examination
Review of the engine logbooks revealed that the starter clutch assembly had been replaced twice within the preceding 15.64 hours of operation. Examination of the engine found that the starter-clutch assembly would not rotate freely. The starter-clutch shaft was observed to be severed into two pieces. Additionally, the bolts that attach the accessory drive-gear to the camshaft were also found severed.
Conclusion
The investigation documented the mechanical failures found in the engine, including the non-rotating starter-clutch assembly, severed starter-clutch shaft, and severed accessory drive-gear bolts. No further analysis or probable cause was provided in the source material.