Abstract: A single-piece piston body for an internal combustion engine includes a crown portion having a circumferential ring belt including an oil ring groove configured to accommodate an oil control ring and a skirt portion having a first skirt wall disposed on the major thrust side and a second skirt wall disposed on the minor thrust side of the piston, and two box walls that connect the skirt walls and which are set back with respect to the ring belt. A first plurality and a second plurality of axial drain passages extend from the oil ring groove to the bottom of the crown portion, the first and second pluralities of axial drain passages being substantially centered at opposite box sides of the piston and each plurality of axial drain passages spanning an arcuate portion of about 45-75 degrees.

Abstract: A cylinder liner and compound seal assembly for an internal combustion engine includes a cylinder liner having a liner body with an outer surface and an inner surface defining a longitudinal bore. The cylinder liner further includes a first axial end, and a second axial end which includes a sealing surface and a protective end projection extending in an axial direction from the sealing surface. A compound sealing mechanism for establishing seals between an engine head and an engine housing includes a one-piece gasket body having an outer radial region and an inner radial region which includes a combustion seal having an engine head sealing surface and a cylinder liner sealing surface, and a recess formed in the lower surface and located radially outward of the cylinder liner sealing surface and configured to receive therein a protective end projection of the cylinder liner.

Abstract: A single-piece piston body for an internal combustion engine includes a crown portion having a circumferential ring belt including an oil ring groove configured to accommodate an oil control ring and a skirt portion having a first skirt wall disposed on the major thrust side and a second skirt wall disposed on the minor thrust side of the piston, and two box walls that connect the skirt walls and which are set back with respect to the ring belt. A first plurality and a second plurality of axial drain passages extend from the oil ring groove to the bottom of the crown portion, the first and second pluralities of axial drain passages being substantially centered at opposite box sides of the piston and each plurality of axial drain passages spanning an arcuate portion of about 45-75 degrees.