Mc Design Refinements

Feedback from MAN B&W MC engines in service has shown average liner wear rates as low as 0.05 mm/1000 hours and cylinder overhauling intervals of 6000-8000 hours. R&D targeting enhanced durability and extended mean times-between-overhauls (TBOs) has focused on:

• Engine structure: experience has shown that the jacket cooling water around the lower part of the cylinder frame may in some cases result in a corrosion attack and thus lead to higher wear rates. Cooling water in the lower part of the liner has therefore been omitted, thus increasing the temperature of the liner surface. The modification has been introduced on the latest engine versions (Figure 10.19). Cracks were experienced in the horizontal support for the forward main bearing in the thrust bearing housing. Investigations revealed that, under special service conditions, the design seemed to leave too narrow a margin; improper welding quality was also a contributory factor. While such rib cracks do not imply any risk with respect to the service of the ship in the short term, they should be rectified at the first available

Previous design

New design

Previous design

New design

Cooling water inlet

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