Abstract: A piston unit for coupling to a crosshead piston rod with a crosshead piston pin includes a piston crown member and an integrated crosshead pin support and skirt member. The piston crown member consists essentially of forged steel. An integrated crosshead pin support and skirt member consists essentially of forged steel. The integrated pin support and skirt member is affixed to the piston crown member and is configured to support the crosshead piston pin. In a method of making a crosshead piston, a piston crown member is forged from steel. An integrated crosshead pin support and skirt member is forged from steel. The piston crown member is welded to the integrated crosshead pin support and skirt member.

Abstract: A coolant groove-type internal combustion engine has a cylinder block that includes a frame having at least one longitudinal surface and a lateral member transverse to the longitudinal surface, the lateral member defining a coolant passage therethrough, wherein the lateral member also defines at least one cylinder opening and a groove coolant port extending from the coolant passage to the cylinder opening. A cylinder liner includes a cylindrical member, defining an elongated cylinder bore. The cylinder member has an outer surface that has a diameter that allows the cylindrical member to be fitted into the cylinder opening so as to form a coolant jacket between the outer surface of the cylindrical member and the longitudinal surface. The outer surface of the cylindrical member includes an upper portion that plugs the groove coolant port.

Abstract: A coolant groove-type internal combustion engine has a cylinder block that includes a frame having at least one longitudinal surface and a lateral member transverse to the longitudinal surface, the lateral member defining a coolant passage therethrough, wherein the lateral member also defines at least one cylinder opening and a groove coolant port extending from the coolant passage to the cylinder opening. A cylinder liner includes a cylindrical member, defining an elongated cylinder bore. The cylinder member has an outer surface that has a diameter that allows the cylindrical member to be fitted into the cylinder opening so as to form a coolant jacket between the outer surface of the cylindrical member and the longitudinal surface. The outer surface of the cylindrical member includes an upper portion that plugs the groove coolant port.

Abstract: A coolant groove-type internal combustion engine has a cylinder block that includes a frame having at least one longitudinal surface and a lateral member transverse to the longitudinal surface, the lateral member defining a coolant passage therethrough, wherein the lateral member also defines at least one cylinder opening and a groove coolant port extending from the coolant passage to the cylinder opening. A cylinder liner includes a cylindrical member, defining an elongated cylinder bore. The cylinder member has an outer surface that has a diameter that allows the cylindrical member to be fitted into the cylinder opening so as to form a coolant jacket between the outer surface of the cylindrical member and the longitudinal surface. The outer surface of the cylindrical member includes an upper portion that plugs the groove coolant port.

Abstract: A piston assembly includes a cross-head piston and a cylindrical cross pin. The cross-head piston includes a piston head having a cylindrical wall, a lateral surface and an opposite inward surface. Two spaced-apart connection ears, each having a proximal end and an opposite distal end, extend outwardly from the inward surface. Each proximal end is affixed to the inward surface and each distal end defines a pin bore passing therethrough. A piston well is defined by the inward surface and the connection ears. The cylindrical cross pin is disposed coaxially with a central axis so as to be engaged with both pin bores. The cross pin defines a central cross pin oil passage passing transversely to the central axis. The cross pin is placed in relation to the piston head so that the second end of the cross pin oil passage is directed to the piston well.