causes of thrown rod
Thrown connecting rods are generally caused by poor lubrication or overspeeding the engine and exceeding the maximum rpm limit. Overspeeding the engine can be easily caused by a propeller with too little pitch.
A thrown rod is usually the result of metal fatigue, insufficient lubrication or over-revving of an engine. When gasoline combusts in a cylinder, it drives the piston head downward, pushing the connecting rod and turning the crankshaft.