Method for preventing exhaust valve seat recession

C - Chemistry – Metallurgy – 10 – M

Patent

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Details

C10M 141/12 (2006.01) C10M 169/04 (2006.01) F01N 3/00 (2006.01)

Patent

CA 2752334

A method for preventing or inhibiting exhaust valve seat recession in a natural gas fueled internal combustion en-gine is disclosed. The method involves lubricating the engine with a lubricating oil composition comprising (a) a major amount of an oil of lubricating viscosity, and (b) a minor amount of a natural gas engine oil additive package, wherein the lubricating oil composition is substantially free of each of any zinc compounds and alkaline earth metal salts of a condensation product of an alkylene polyamine, an aldehyde and a substituted phenol.

La présente invention porte sur un procédé permettant d'empêcher ou d'interdire un retrait de siège de soupape d'échappement dans un moteur à combustion interne à gaz naturel. Le procédé met en jeu la lubrification du moteur avec une composition d'huile lubrifiante comprenant (a) une quantité principale d'une huile de viscosité de lubrification, et (b) une quantité secondaire d'un groupe d'additifs d'huile moteur à gaz naturel, la composition d'huile lubrifiante étant sensiblement exempte de chacun d'un quelconque composé de zinc et d'un sel de métal alcalino-terreux d'un produit de condensation d'une polyamide alkylène, d'un aldéhyde et d'un phénol substitué.

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