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wartsila logoApplicability: All owners, operators and personnel involved in maintaining and surveying vessels which have Wärtsilä RT-flex 2 stroke engines fitted with WECS-9520 control systems
 
Wärtsilä recently released Technical Bulletin RT-153 warning of a potential issue regarding RT-flex 2 stroke engines fitted with WECS-9520 control systems.

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nocyl_l-strdOccasionally patches of black deposits appear on the cylinder liner wall of 2-stroke engines. The black spots typically appear in the mid-stroke area of the liner, roughly between the oil quills and the scavenge ports.

Analysis shows the deposits mainly consist of Calcium Sulphate, some water is found, and some oxidation products from hydrocarbons. Calcium Sulphate is commonly known as Gypsum.

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