Failures of single cylinder diesel engines crank shafts

The single cylinder diesel engines are extensively used in agricultural areas for several purposes such as water pumping. In some cases, these engines are also used for driving some auxiliary agricultural vehicles. This imposes unexpected loads on the components of the engines resulting in the premature failures. In this study, two different failure cases of crankshafts of these engines are analyzed. Some characterization studies and fractographic analyses are carried out to asses the failure reason. However, the cranks have some miner design differences, both failures are occurred after a fatigue process. One of the failed cranks has important heat treatment error.