Abstract: A producing method for a cylinder block includes: a spraying step of spraying a metallic material onto a bore inner surface of at least one cylinder bore formed in the cylinder block to form a spray deposit thereon; a pressurizing step of applying a predetermined pressure onto a surface of the spray deposit formed on the bore inner surface in the spraying step; and a honing step of applying a honing processing to the surface of the spray deposit after the pressurizing step.

Abstract: A water jacket spacer is inserted into a water jacket. The water jacket spacer includes an expansion member, a plate-shaped holder to which the expansion member is fixed, and a leaf spring that abuts the inner wall of the water jacket. The leaf spring projects from a face on the holder on the side opposite of the expansion member. The holder curves to match the shape of the water jacket. The position of the water jacket spacer in the water jacket is maintained by the biasing force of the leaf spring.

Abstract: A producing method for a cylinder block includes: a spraying step of spraying a metallic material onto a bore inner surface of at least one cylinder bore formed in the cylinder block to form a spray deposit thereon; a pressurizing step of applying a predetermined pressure onto a surface of the spray deposit formed on the bore inner surface in the spraying step; and a honing step of applying a honing processing to the surface of the spray deposit after the pressurizing step.

Abstract: An exhaust valve includes: a shaft section; and a head section that is formed in one end of the shaft section and formed with a valve face that seats on a valve seat disposed in a cylinder head of an internal combustion engine, in which the shaft section has a shaft diameter of a constant diameter; the head section has a head diameter that is larger than the shaft diameter; and a thick shaft section that has a diameter smaller than the head diameter and larger than the shaft diameter is formed within a section between a connecting position that connects the shaft section with the head section and a position that is spaced apart from the head front surface opposite to the valve face in an axial direction by a distance that is approximately the same as the head diameter.