Course of events
The ship was alongside in port when the main engine was started, and the oil mist detector gave a warning alarm. When opening up the crank case a hot crankpin bearing was found. The crankshaft was found to be seriously damaged in way of one crankpin, causing the vessel to be put off hire for more than a month before resuming operation.

Extent of damage
The original crankshaft was damaged beyond repair, and a new one was fitted, following the manufacturer’s recommendations.

Probable cause
The main medium speed diesel engine is elastically mounted by using rubber mounts. Thus all cooling water, fuel oil and lubricat- Information from DNV to the maritime industry No. 5 December 2007

Source: Det Norske Veritas S.A.

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File	Description	File size
CASUALTY_INF-NO5DECEMBER_2007[1].pdf	Probable cause : The main medium speed diesel engine is elastically mounted by using rubber mounts. Thus all cooling water, fuel oil and lubricat- Information from DNV to the maritime industry No. 5 December 2007	89 Kb