Abstract: An engine assembly includes an engine block, a cylinder head coupled to the engine block with a cooling system running through both. The engine block defines a first cylinder bore and a first cylinder cooling jacket at an outer periphery of the first cylinder bore. The cylinder head defines a first port cooling jacket for a first set of ports in communication with the first cylinder bore. The coolant supply is in communication with the first cylinder cooling jacket and the first port cooling jacket. The first port cooling jacket defines a first head coolant flow path in a parallel flow arrangement with a coolant flow path defined by the first cylinder cooling jacket.

Abstract: In an exemplary embodiment, an internal combustion engine includes an oxidation catalyst configured to receive an exhaust gas flow from the internal combustion engine, a urea injector positioned downstream of the oxidation catalyst to inject a urea flow into the exhaust gas flow and a mixer positioned downstream of the urea injector to mix the exhaust gas flow and the urea flow to form a mixed exhaust gas and urea flow. The engine also includes a particulate filter and catalytic reduction assembly positioned downstream of the mixer to receive the mixed exhaust and urea flow from the mixer to form a treated exhaust gas flow and an exhaust gas recirculation system coupled to the particulate filter to receive a portion of the treated exhaust gas flow and recirculate the portion of the exhaust gas flow to be mixed with a fresh air flow for the internal combustion engine.

Abstract: A cooling system for an engine assembly includes an engine block that defines a coolant flow passage configured to carry coolant through the engine block. The engine block also defines an oil flow passage configured to carry lubricating oil through the engine block. The oil flow passage at least partially surrounds the coolant flow passage and is sufficiently adjacent to the coolant flow passage so that the lubricating oil flowing in the oil flow passage is cooled by the coolant flowing in the coolant flow passage by heat transfer through the engine block. The engine block may define ridges along the coolant flow passage that increase a surface area of the coolant flow passage to increase heat transfer capability. The engine block may define two such coolant flow passages, a first and a second coolant flow passage, positioned so that the oil flow passage passes between the coolant flow passages.

Abstract: A cooling system for an engine assembly includes an engine block that defines a coolant flow passage configured to carry coolant through the engine block. The engine block also defines an oil flow passage configured to carry lubricating oil through the engine block. The oil flow passage at least partially surrounds the coolant flow passage and is sufficiently adjacent to the coolant flow passage so that the lubricating oil flowing in the oil flow passage is cooled by the coolant flowing in the coolant flow passage by heat transfer through the engine block. The engine block may define ridges along the coolant flow passage that increase a surface area of the coolant flow passage to increase heat transfer capability. The engine block may define two such coolant flow passages, a first and a second coolant flow passage, positioned so that the oil flow passage passes between the coolant flow passages.

Abstract: In an exemplary embodiment, an internal combustion engine includes an oxidation catalyst configured to receive an exhaust gas flow from the internal combustion engine, a urea injector positioned downstream of the oxidation catalyst to inject a urea flow into the exhaust gas flow and a mixer positioned downstream of the urea injector to mix the exhaust gas flow and the urea flow to form a mixed exhaust gas and urea flow. The engine also includes a particulate filter and catalytic reduction assembly positioned downstream of the mixer to receive the mixed exhaust and urea flow from the mixer to form a treated exhaust gas flow and an exhaust gas recirculation system coupled to the particulate filter to receive a portion of the treated exhaust gas flow and recirculate the portion of the exhaust gas flow to be mixed with a fresh air flow for the internal combustion engine.

Abstract: A method of manufacturing a pump assembly includes sand casting a pump housing with a cavity and die casting an impeller that includes pump blades and a first portion of a shroud. The pump housing may be sand cast as a one-piece component and the impeller may be die cast as another one-piece component. A pump cover is provided with a second portion of the shroud. The pump cover is inserted into the cavity so that the second portion of the shroud is adjacent to the first portion of the shroud, providing a substantially continuous surface defining flow channels through the impeller. A pump assembly manufactured according to the method is also provided.

Abstract: In one exemplary embodiment of the invention an exhaust after treatment system is provided that includes an inlet housing, an inlet in the inlet housing configured to receive an exhaust gas flow from an internal combustion engine and an outlet in the inlet housing configured to direct the exhaust gas flow to a pollutant reduction device. The system also includes a deflector coupled to an inner surface of the inlet housing, the deflector configured to receive the exhaust gas flow from the inlet and uniformly direct the exhaust flow through the outlet and to the pollutant reduction device.

Abstract: An engine assembly includes an engine block, a cylinder head coupled to the engine block with a cooling system running through both. The engine block defines a first cylinder bore and a first cylinder cooling jacket at an outer periphery of the first cylinder bore. The cylinder head defines a first port cooling jacket for a first set of ports in communication with the first cylinder bore. The coolant supply is in communication with the first cylinder cooling jacket and the first port cooling jacket. The first port cooling jacket defines a first head coolant flow path in a parallel flow arrangement with a coolant flow path defined by the first cylinder cooling jacket.

Abstract: A cooling system for an engine assembly includes an engine block that defines a coolant flow passage configured to carry coolant through the engine block. The engine block also defines an oil flow passage configured to carry lubricating oil through the engine block. The oil flow passage at least partially surrounds the coolant flow passage and is sufficiently adjacent to the coolant flow passage so that the lubricating oil flowing in the oil flow passage is cooled by the coolant flowing in the coolant flow passage by heat transfer through the engine block. The engine block may define ridges along the coolant flow passage that increase a surface area of the coolant flow passage to increase heat transfer capability. The engine block may define two such coolant flow passages, a first and a second coolant flow passage, positioned so that the oil flow passage passes between the coolant flow passages.

Abstract: A method of manufacturing a pump assembly includes sand casting a pump housing with a cavity and die casting an impeller that includes pump blades and a first portion of a shroud. The pump housing may be sand cast as a one-piece component and the impeller may be die cast as another one-piece component. A pump cover is provided with a second portion of the shroud. The pump cover is inserted into the cavity so that the second portion of the shroud is adjacent to the first portion of the shroud, providing a substantially continuous surface defining flow channels through the impeller. A pump assembly manufactured according to the method is also provided.