Marine Engine Lubrication
OwnerJames C. Doddinventor
Life of this patent
Estimating the term…
Abstract
A two-stroke, cross-head, slow-speed, compression-ignited marine engine is operated by (i) fuelling it with a diesel fuel, as a pilot fuel, and with a low sulphur fuel, as a main fuel; and (ii) lubricating the engine cylinder(s) with a lubricant having a BN of 20 or less and having a detergent additive system comprising one or more different metal detergents having a surfactant group selected from phenate, salicylate and sulphonate, or one or more complex metal detergents containing two or more different surfactant soap groups selected from phenate, salicylate and sulphonate, and a distilled cashew nut shell liquid or hydrogenated distilled cashew nut shell liquid.
Claims13
A method of operating a two-stroke, cross-head slow-speed compression-ignited engine comprising
- (i) fuelling the engine with a diesel fuel, as a pilot fuel, and with a low sulphur fuel, as a main fuel;
- and
- (ii) lubricating the cylinder(s) of the engine with a cylinder lubricant having a base number (BN) of 20 mg KOH/g or less, comprising a detergent additive system comprising one or more metal detergents having a surfactant selected from phenate, salicylate and sulphonate, or one or more complex metal detergents containing two or more different surfactant soap groups selected from phenate, salicylate and sulphonate, and comprising 1-5 mass %, based on the lubricant mass of one or more phenolic compounds comprising distilled cashew nut shell liquid or hydrogenated distilled cashew nut shell liquid.
Dependencies are inferred from the claim text.