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main engine exhaust gases bellows creaks

main engine exhaust gases bellows creaks

(OP)
hi all
i am chief engineer on board DP2 AHST which equipped with 2 YANMAR 8N280M-EV main engine.Sb side engine exhaust gases bellows creaked many times.i checked the aliment, bellows instillation direction, exhaust gases temperature and bellows fastening. every thing is OK. This fault happened 3 times in one year although the port side engine running normally without any problems in it's exhaust bellows working condition and engine parameters nearly the same for both engine.
any advise will be highly appreciated.
best regards   

RE: main engine exhaust gases bellows creaks

Carry more spares.
By which I mean, a year of life for a main exhaust bellows is typical, statistically, but earlier failure is not unknown.

By 'installation direction', I hope you mean that the bellows 'liner' is mounted to the upstream flange, so that the dead space between that tube and the bellows proper is filled with relatively cooler gas.

Double check the motor mounts; if an engine is flopping around on a partially broken mount, it can take out a bellows pretty quickly, even if it only does the huckle-buck at certain speeds.

 

Mike Halloran
Pembroke Pines, FL, USA

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