Abstract: In a water-cooling system for a water-cooled horizontal engine, a radiator and a radiator fan are arranged at the front of a cylinder head which is mounted forwardly of a cylinder block of the engine. A radiator fan generates a cooling air flow which passes through the space over the cylinder head and toward the radiator, the height of the radiator being sized to match the width of the cylinder block measured in the upward and downward direction.

Abstract: A system for blow-by gas return to the combustion chamber of an engine according to the present invention including an oil separator with an inlet communicating with an outlet through a diffusion chamber and a filter element; said oil separator communicating with the crankcase of the engine through a breather and an inlet pipe, and also communicates with the intake manifold of the engine through an outlet pipe, so as to separate the oil from the blow-by gas almost completely. The oil separator and the inlet and outlet pipes are disposed in a space directly over the cylinder head of the engine and the intake manifold, so as to prevent ice accumulation therein by the radiation and convection of engine heat thereon.

Abstract: In a water-cooling system for a water-cooled horizontal cylinder engine, a radiator and a radiator fan are arranged at the front of a cylinder head which is mounted forwardly of a cylinder block of the engine. A radiator fan generates a cooling air flow which passes through the space over the cylinder head and toward the radiator, the height of the radiator being sized to match the width of the cylinder block measured in the upward and downward direction.

Abstract: Two plastic tubelike members on which an annular protrusion or an annular groove are respectively provided to be used as two constructive block members for assembling valve or joint devices are directly coupled to assemble such devices. Critical dimensional relationships on the coupling end having the annular groove are established wherein a deformation process can be controlled to engage the annular groove with the annular protrusion by a radially widening motion and an axially spring motion in elastic dynamics, while the coupling end having the annular groove is softened by heating to become elastic. High coupling accuracy can be secured with high coupling strength and durability.

Abstract: A frame type tractor comprising an engine in a front portion, a transmission case in a rear portion thereof, a transmission shaft extending from the engine to the transmission shaft, and a front wheel drive shaft extending from the transmission case to a front wheel axle. The transmission shaft and front wheel drive shaft are connected to lower positions of the transmission case. An operator's step is mounted over the transmission shaft and front wheel drive shaft.

Abstract: A frame type tractor comprising an engine mounted on a forward region of a body frame, and a transmission mounted on a rear region of the body frame and operatively connected to the engine through a transmission shaft. The transmission consists of an input section, a change speed section and an output section. The input section includes an input shaft connected to the transmission shaft, a wet type multidisk clutch for establishing and breaking transmission of a engine drive received from the input shaft, and an oil pump driven by the input shaft.

Abstract: A closed evaporative cooling system for an engine includes a water jacket having an opening formed through an upper wall of said engine, a condenser having an upper tank, a bottom plate and condenser tubes, a seat formed around said upside opening for fixing said bottom plate of said condenser thereon, a pressure regulating valve for regulating internal pressure of said upper tank, each of said tube has an upper end penetrating through the bottom wall of said upper tank and brazed or soldered thereto, and a lower end penetrating through said bottom plate and brazed or soldered thereto respectively, and the system further includes a damper pipe for damping the variation of internal pressure of said upper tank, having one end communicated with said upper tank of said condenser fixed on the upper part of said water jacket of said engine and another end communicated with said pressure regulating valve.

Abstract: The present invention relates to a valve moving system of an over head valve engine, minimized the overall height of cylinder head and head cover by inclining valve stems and footing bolts of rocker arm supports, and by disposing the part of upper wall of the cylinder head, where said footing bolts are screwed in, lower than bosses for supporting valve stems, which are also formed on said upper wall of said cylinder head, so as to match said engine with any machines which have a side valve engine for general use.

Abstract: The present invention relates to a cooling means for the squish part of an air cooling over head valve engine, comprising a fan disposed in front of said engine for generating cooling wind. A fan case is provided which covers the front side of the fan and engine. A wind tunnel is formed through the cylinder head of said engine near the squish area and is aligned so as to pass a cooling wind, generated by the fan, above the squish area. The engine is provided with an intake and exhaust ports opening at the front and rear surfaces of said cylinder head, respectively. In the lateral side of the wind tunnel, an intake or exhaust pipe is disposed laterally over the front space of the tunnel, so as to guide cooling wind blown up from the fan to the tunnel along its lower peripheral surface thereof.

Abstract: The present invention relates to an automatic decompression system for starting an engine with a decompression pin penetrating the cam shaft to thrust a tappet of the valve moving system by biasing force of a spring for decompression and retreated from the tappet by centrifugal force of a fly weight and itself, wherein, said fly weight is inserted in the space between the inner periphery of the rim of the cam gear, which rim is extruded toward the cam, and the outer periphery of the flange faced against the outer periphery of the rim, which flange functions to decide the axial position of the cam gear.

Abstract: An apparatus for the return of crankcase vapors into a combustion chamber of an internal combustion engine, and for separating lubricating oil mist in the crankcase vapors. Some of the lubricating oil mist being removed primarily with a breather device and the residual oil mist being separated secondarily with an oil-bath type air cleaner, by directing the vapors into the air cleaner through a vapor passage.