Exhaust valve guide for engines

Abstract

An exhaust valve guide for engines which is not corroded with SOx contained in an exhaust gas from an engine in which EGR is carried out, or from an engine using a fuel of a high sulfur content. A tubular member of the exhaust valve guide is press-fitted in a receiving hole of a cylinder head. A valve stem of an exhaust valve is slidably inserted into a shaft hole of the tubular member. An inner side of the shaft hole of the exhaust valve guide is surface treated with a material having a corrosion resistance and an abrasion resistance. The tubular member is made of, for example, regular cast iron, and the surface treatment operations using a material having a corrosion resistance and an abrasion resistance include, for example, Cr plating, Mo flame spraying, Ni plating.

Dependencies are inferred from the claim text.