This blow-by gas discharge device is provided with: blow-by gas piping 23 which is extended from the height position of the upper end of an internal combustion engine 1 to the height position of the lower end, is exposed to the outside air, and has an outlet 33 open to the atmosphere; and a heating chamber 24 which is provided between the ends of the blow-by gas piping, is formed in the flywheel housing 10 of the internal combustion engine, and heats blow-by gas.

Provided is a timing chain cover that allows suppressing vibration transmission. A timing chain cover of the present disclosure houses a timing chain transmitting a rotative force of a crankshaft to a camshaft in one end side of an internal combustion engine. The timing chain cover includes a chain cover main body and a damping resin layer formed on an abutment surface of the chain cover main body. The abutment surface abuts on an internal combustion engine main body. The damping resin layer contains a heat resistant resin and a damping filler. The damping filler converts a vibration energy into a heat energy.

An internal combustion engine includes a one-piece cylinder block casting, a flywheel supported for rotation at a front block end, and a back gear train supported for rotation at a back block end. Cast-in pump inlet and outlet passages are formed in the cylinder block casting and open in a pump mounting face at the back block end. An oil pump is clamped to the pump mounting face and includes a pump inlet and a pump outlet fluidly connected, respectively, to the cast-in pump inlet passage and the cast-in pump outlet passage.

An internal combustion engine includes a one-piece cylinder block casting, a flywheel supported for rotation at a front block end, and a back gear train supported for rotation at a back block end. Cast-in pump inlet and outlet passages are formed in the cylinder block casting and open in a pump mounting face at the back block end. An oil pump is clamped to the pump mounting face and includes a pump inlet and a pump outlet fluidly connected, respectively, to the cast-in pump inlet passage and the cast-in pump outlet passage.

Provided is a cover structure for an air-cooled engine to be cooled by cooling air generated by a cooling fan, the cover structure including: a fan housing covering the cooling fan and configured to guide the cooling air to a cylinder unit, the fan housing being formed with an opening part for maintenance of the cylinder unit; and a debris cover removably attached to the fan housing so as to close the opening part. The fan housing is formed with an air guide plate that constitutes a part of an outer periphery of the fan housing. The air guide plate includes a proximal end portion and a distal end portion extending from the proximal end portion to a cooling fin of the cylinder unit. A reinforcing plate for securing rigidity of the fan housing is formed at the proximal end portion of the air guide plate.

Provided is a cover structure for an air-cooled engine to be cooled by cooling air generated by a cooling fan, the cover structure including: a fan housing covering the cooling fan and configured to guide the cooling air to a cylinder unit, the fan housing being formed with an opening part for maintenance of the cylinder unit; and a debris cover removably attached to the fan housing so as to close the opening part. The fan housing is formed with an air guide plate that constitutes a part of an outer periphery of the fan housing. The air guide plate includes a proximal end portion and a distal end portion extending from the proximal end portion to a cooling fin of the cylinder unit. A reinforcing plate for securing rigidity of the fan housing is formed at the proximal end portion of the air guide plate.

An engine device including a cylinder block having one side portion to which a flywheel that is rotated integrally with a crankshaft is disposed. The engine device is provided with a starter that transmits a rotational force to the flywheel at a time of engine start. A flywheel housing, which accommodates the flywheel and includes a starter attachment pedestal for attaching the starter, is attached to the one side portion of the cylinder block. The starter is disposed inner side of the engine than a portion of the flywheel housing, the portion being located outermost in the engine with respect to a direction that is perpendicular to a direction along a crankshaft center and that is parallel to the cylinder head joining surface of the cylinder block.

Methods and systems are provided for an engine component assembly having one or more fastener retention apparatuses. In one example, a system may include each of the one or more fastener retention apparatuses including a rigid limiter and an integrated fastener retention feature adhered to an inner surface of an interior passage of the rigid limiter. Further, one or more fasteners may be held captive by each of the one or more fastener retention apparatuses capturing one fastener of the one or more fasteners.

An engine device having a flywheel housing in which a flywheel that is rotated integrally with a crankshaft is accommodated on one side portion of a cylinder block, in which the cylinder block is integrally formed with housing bracket portions each protruding in a direction away from the crankshaft from each of opposite side portions of the cylinder block extending along a crankshaft axial direction, the housing bracket portions protruding from end portions of the opposite side portions close to the one side portion, and a space surrounded by the one side portion, the housing bracket portions, and the flywheel housing constitutes a gear case for accommodating therein a gear train.

An engine includes: a crankcase; a cover that is connected to the crankcase at a mating surface of the cover inclined toward an inner side in a vehicle width direction in going downward when the engine is mounted to a vehicle body, the cover covering a protruding end of a rotary shaft; and attachment bosses that are formed to be integral with the cover, have a predetermined height from the mating surface, and accept fastening members for fastening the cover to the crankcase. Accordingly, when mounted on a two-wheeled motor vehicle, the engine can restrain protrusion in the vehicle width direction and can be disposed at a position as low as possible with reference to the vehicle.