Maintenance and Repairs

Machining ZA40 Bottom End

 
 

 

 

After failure of the bottom end on a Sulzer ZA40V engine, tests were carried out to ensure that overheating had not cracked or affected the hardness of the crankpin. After discussion and with approval of the classification society, the crankshaft was remachined and new undersize bearings fitted.

 

 

The photographs show the wiped bearings, the damaged crankpin, and the chain driven cutting tool set up to machine the crankpin. The bright marks on the partially machined crankpin show the hard spots caused by localised overheating.

 

 

 

The last photograph shows the crankpin after initial machining and before final finishing.

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