Damage Analysis Of Crank Pin Number 4 Sulzer 12 ZAV 40 S PLTD Ampenan Unit 7

The Crank Pin is a part of the Crank Shaft which functions as a place where the Connecting Rod is installed. The Crank Pin together with the Crank Shaft functions to change the up and down (translational) movement of the piston into rotational or rotary movement. The crankshaft is the main component in the diesel engine used by PLTD. Diesel Power Plant (PLTD) are a type of creator that's still extensively used in Indonesia. The presence of cracks on the crankshaft surface can be a potential risk of engine damage or failure. Cracks on the crankshaft surface can be caused by operational failures such as lubrication failure, jammed bearings and overspeed. The characteristics of cracks resulting from operational failure are the direction of crack propagation parallel to the axis of the shaft and a high surface hardness value. Apart from being a result of operational failure, cracks in the crankshaft can be caused by material fatigue due to cyclic loading. There was a problem with Crank Pin number 4 of PLTD Ampenan Unit 7 which caused the unit to not operate. In this case the author carried out a series of observations and tests to determine the level of crank pin damage. From the test results, an analysis of the causes of the disturbance will be carried out and recommendations for actions that must be taken will be carried out.