Method for reducing piston deposits in a marine diesel engine

A method of reducing the incidence of deposits on the pistons of a 4-stroke marine diesel engine during operation of the engine when it is fuelled with a marine residual fuel meeting the 5 ISO 8217 2017 fuel standard for marine residual fuels and having a sulphur content of more than 0.1% and less t...

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Bibliographische Detailangaben
Hauptverfasser:	HUGHES, Jonathan Mark, MARSH, Adam Paul, CLITHEROW, Tim
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMISTRY FUELS LUBRICANTS LUBRICATING COMPOSITIONS METALLURGY PEAT PETROLEUM, GAS OR COKE INDUSTRIES TECHNICAL GASES CONTAINING CARBON MONOXIDE USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATINGINGREDIENTS IN A LUBRICATING COMPOSITION
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Beschreibung
Zusammenfassung:	A method of reducing the incidence of deposits on the pistons of a 4-stroke marine diesel engine during operation of the engine when it is fuelled with a marine residual fuel meeting the 5 ISO 8217 2017 fuel standard for marine residual fuels and having a sulphur content of more than 0.1% and less than 0.5% by mass. The method comprises lubricating the engine using a lubricating oil composition comprising: (a) at least 50% by mass, based on the mass of the composition, of an oil of lubricating 0 viscosity; (b) 5 to 25% by mass, based on the mass of the composition, of an oil-soluble or oil dispersible alkali metal or alkaline earth metal salicylate detergent, or a mixture of two or more oil-soluble or oil-dispersible alkali metal or alkaline earth metal salicylate detergents; 5 (c) 0.1 to 10 % by mass, based on the mass of the composition of one or more oil-soluble or oil-dispersible ashless dispersants; and optionally, (d) 0.1 to 10 % by mass, based on the mass of the composition of a polyalkylene-substituted succinic anhydride.