Damage Analysis of The Electric Generator Diesel Engine Connecting Rod

Abstract

Diesel engine power plant suffered damage to a number of engine components after being operated a long time before. Damage begins with the sound of harsh sounds and then followed by very large vibrations. With this incident, the operator in charge then performs an emergency stop. Visually it is known that engine components that are damaged include the engine block and cylinder liner broken, broken piston rods, and broken crankcase covers. A number of engine components look out of position. From the visual observations obtained that the damage that occurs in the diesel engine most likely starts from damage that occurs in the piston rod. Therefore, the damage analysis carried out is only aimed at efforts to determine the types and factors that cause damage to the piston rod. A number of laboratory tests have been carried out including analysis of macroscopic examination of fracture surfaces, metallographic tests. From the results of damage analysis obtained shows that damage to the diesel engine piston rod is likely caused by wear that occurs at the small end of the piston rod so that it causes looseness in the bushing and causes enlargement in the gap between the rod eye and bushings. This condition causes a very large increase in stress on the bushing and rod eye so that the bushing is overloaded and in the end can cause damage (crack / break) on the bushing.