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Wartsila’s User Group Forums 50 SG Engine Oil Analysis: Source of rising Al content?

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    We have 4 each 50SG engines that have been in operation for about 1 1/2 years.   The lead unit has logged just over 5000 hours, with the lag unit over 3000 hours.  Run-times average 8-10 hours/start in daily peaking service.

    Quarterly oil analysis is showing a rising trend in Aluminum content, with 2 units at or over 10 ppm.   Oil is Mobil Pegasus 1005, and make-up rates have been well within spec.

    We’re not aware of any aluminum components in these engines apart from the valve covers, crankcase covers, and similar non-wearing items.  Has anyone else seen rising aluminum content in your oil analysis, and if so, what is the source?

    Dave Mordecai, Hopkins Generating Station

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