LT Cooling Water O Ring Material?

[Anonymous]

Fellow 18V50 Owners,  We have seen several failures of O ring part # 354 1628 and 354 414 on the LT cooling water lines to the charge air coolers.  The O rings appear undamaged when removed apart from a permanent flattening of the ID where they contact the pipe.  These leaks have all occurred at very low hours (2500-5000 hrs).  I suspect that a better grade O ring material would have a longer service life, but do not know what material was originally used by Wartsila.  Does anyone out there know what these O rings are made of, and have any of you switched to aftermarket Viton or other materials for longer life?

Thanks in advance,

Dave Mordecai, Hopkins Generating Station

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