When Boring Is Interesting

Line Boring MAN B&W 12K80MC

Having carried out major engine overhauls in the area in the past, it was no surprise when Goltens was awarded the contract to line bore an MAN B&W 12K80MC engine at a power plant in Guam, Micronesia. The plant had suffered a casualty that damaged one of the engine’s main journals and damaged one of the bearing pockets.

While line boring and in-situ machining are daily occurrences for Goltens, the extra large bore diameter of 992mm on the B&W 12K80MC engine made the job more challenging.

Goltens Singapore first completed in-situ machining of the damaged crankshaft main journal in the agreed time and to the engine maker’s satisfaction. Following this, a solution was proposed and agreed to regarding repair to the damaged bearing pocket and collapsed saddle. The solution involved removal of the crankshaft from the engine to create sufficient space for machining.

A complete inspection was then carried out, confirming the need for oversize machining of one bearing pocket as well as the correction of landing faces in order to achieve good contact before further machining. The in-situ boring bar was then mounted in the correct position using laser alignment tools, and the line bore was completed within two days.