MAIN ENGINE ROLLER CHAIN DAMAGE
MAN B&W 6S70MC-C engine visited to find reason of abnormal sound in M/E roller chain casing.
Based on the inspection; it was found that guide bars were severely damaged which is common phenomenon, however guide bar damage itself would not cause that much noise.
After further investigation, it was found out that aft chain has become slacked on some particular point, due to defect on one of the links which is about to detached.
To rectify such serious defects, damaged ones have been replaced with new link thus the proper tightening adjustment performed according to the manufacturer specifications.
In general roller chains are trouble free systems and no need much attention, however in case of failure; consequences might be devastating.
Considering above, it is worth to spend time to carry out regular chain inspection according to MAN B&W Maintenance Manual Section-906.
