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A marine diesel running at 350 rpm had satisfactorily completed 13,000 h before failure of one of the piston pins took place. The pin, 17 in. long, with a central bore of 3 in. diam, failed transversely approximately 3 in. from one end. The characteristic conchoidal markings indicative of fatigue failure were present with origins at about the mid-thickness of the pin located each side of the step in the fracture surface. In addition, cracking was evident in the axial direction. The crack ran into one of the radial oil holes near the end of the pin. A further...

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