A 2500kw High speed Main Propulsion engine suffered failure by seperation of the piston Crown. Shown below is the detached crown seized in the liner.

Damage occurred to an extent that the conrod was able to exit the liner space and impact and break several adjacent structures. Shown below is the conrod sitting on an adjacent bearing cap. Damage can be seen to liner, adjacent entablature structure and next unit.

The severe action of the conrod caused failure of the bottom end arrangement. Here can be seen that at least one of the cap bolts has failed and that the cap has several hammer blow indentations.

This led to failure of both the effect unit and also through loss of lubrication the adjacent unit mounted on the same pin. Shown below are the two bearing shells. In addition damage is shown to the pin in the form of a deep indentation. This alone would have cuased the crankshaft to be scrapped as too great a reduction in diameter would have been required to restore the running surface. There was also a raised section on the opposite side caused by transfer of material either from the shell or con rod.
Several fractures occured as well as material seperation.

• Dry Docking Operations - 2009-07-04 - 02:13:45
• Alternator repair - 2009-06-29 - 06:18:03

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