MBLP MEC encountered the same flaking condition early on. The flakes were very large and almost looked like brown snow coming down. We reported it via a claim on each of our three 18V50DF engines. The Wartsila response was the same as what you received:
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<p style=”margin: 0in 0in 0pt;”><span lang=”EN-GB” style=”mso-ansi-language: EN-GB;”><span style=”color: #000000; font-family: Calibri;”>Below is the comment from TS in regards to 3 claims:</span></span></p>
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<p style=”margin: 0in 0in 0pt;”><span style=”color: black; font-family: ‘Arial’,sans-serif; font-size: 8.5pt;”>According to the provided information and samples.
The ejected material is magnetic and seems to be milling scales from the manufacturing of the exhaust gas ducts steel pipes.
The stack should be from Corten B.
Corten has the function that after significant hot / dry cycles the steel form a protective layer.
This site has short running hours, so the problem should cure over time as the milling scale is lost and the protective layer is formed.</span></p>
John