Abstract: A cylinder liner for use in an internal combustion engine has an inner peripheral surface at which a surface treatment layer is formed upon water vapor treatment. The surface treatment layer has a surface configuration capable of providing excellent lubrication oil retaining function and initial break-in property as well as capable of being machined easily. The treatment surface of the cylinder liner has a plateau configuration providing a surface roughness Rz of 0.8 to 5.9 ?m, and the plateau configuration is defined under DIN4776 by a reduced peak height Rpk of not more than 0.64 ?m, a core roughness depth Rk of 0.05 to 1.8 ?m, and a reduced valley depth Rvk of 0.15 to 3.3 ?m. For grinding to the surface, a honing machine employs a grindstone containing metal bonded diamond grains at high density. Diamond grain size is not less than 4000.

Abstract: A cylinder liner for use in an internal combustion engine has an inner peripheral surface at which a surface treatment layer is formed upon water vapor treatment. The surface treatment layer has a surface configuration capable of providing excellent lubrication oil retaining function and initial break-in property as well as capable of being machined easily. The treatment surface of the cylinder liner has a plateau configuration providing a surface roughness Rz of 0.8 to 5.9 &mgr;m, and the plateau configuration is defined under DIN4776 by a reduced peak height Rpk of not more than 0.64 &mgr;m, a core roughness depth Rk of 0.05 to 1.8 &mgr;m, and a reduced valley depth Rvk of 0.15 to 3.3 &mgr;m. For grinding to the surface, a honing machine employs a grindstone containing metal bonded diamond grains at high density. Diamond grain size is not less than 4000.

Abstract: A cylinder liner formed of a cast iron and having an inner peripheral surface subjected to honing which forms cross-hatching grooves on the surface. A resultant surface roughness ranges from 0.4 &mgr;mR3Z to 0.8 &mgr;mR3Z, and an open phase rate of graphite is not less than 80% at the inner peripheral surface.