Patent ID: 7392771

Claim:
A cylinder sleeve for being inserted in a cylinder bore defined in a block body of a cylinder block for an internal combustion engine, said cylinder bore having therein a first annular recess and a second annular recess, and projecting walls, said cylinder bore communicating with a water jacket, comprising: a hollow cylindrical body that is inserted into the cylinder bore with at least part of an outer circumferential wall thereof adjacent to an inner circumferential wall of the protecting walls of the cylinder bore; a larger-diameter portion projecting diametrally outwardly from an upper end of the outer circumferential wall of said hollow cylindrical body, and closing an end of said water jacket at a gasket surface; a step disposed on an outer circumferential wall of said larger-diameter portion, and a reduced-diameter portion provided by reducing a diameter of an inner circumferential wall of said hollow cylindrical body, said reduced-diameter portion being located at a position adjacent to the projecting walls of the cylinder bore; wherein said larger-diameter portions of said adjacent cylinder sleeves are stacked through said step.