Engine includes: crankcase housing crankshaft extending in vertical direction; cylinder block mounted on side of crankcase and formed with cylinder; cylinder head mounted on side of cylinder block and provided with air inlet port and air outlet port communicating with cylinder; cylinder head cover mounted on side of cylinder head and covering air inlet port and air outlet port; mount case including: supporting portion provided below crankcase and cylinder block and supporting crankcase and cylinder block; and extending portion extending from supporting portion below cylinder head and cylinder head cover; oil pan provided below mount case and storing lubricating oil; and communication tube communicating first space formed between cylinder head and cylinder head cover and second space formed between mount case and oil pan. Communication tube is provided between cylinder head cover and extending portion.

A two-cycle internal combustion engine with rear compression chamber, other than that of a crank case. This present engine has valves that can be screwed on the engine block near top dead center, and is actuated by air pressure. This present two-cycle engine yet uses an oil sump similar to that of a four-cycle engine, which eliminating the need to premix oil with the fuel. This present engine has a stationary piston which operates within a movable piston to form a rear-compression chamber. The movable piston has ports near its crown to transfer charge to the combustion chamber. The movable piston also has ports near bottom of its skirt to allow the fuel and air mixture to enter the rear compression chamber. This engine has a piston seat which is adapted to connect the movable piston to the connecting rod.

Side surfaces of an end cam cap and a pair of side surfaces of a recess for cam cap form two cross-sectional area gradually changing gaps therebetween. A gasket is filled between an inner surface of the recess for cam cap and an outer surface of the end cam cap. The inner surface includes the side surfaces of the recess for cam cap and the outer surface includes the side surfaces of the end cam cap.

Oil distribution blocks and oil distribution systems equipped therewith. Such an oil distribution block includes a rigid block body configured to be secured to a cylinder head of an engine, an oil inlet, and an oil outlet. The oil inlet is configured to be releasably coupled to a first oil distribution line or a fitting therebetween, receive a flow of oil therefrom, and route the oil to an inlet of a cooling passage of the cylinder head. The oil outlet is configured to be releasably coupled to a second oil distribution line or a fitting therebetween, receive a flow of oil from an outlet of the cooling passage of the cylinder head, and route the oil to the second oil distribution line. The oil inlet and the oil outlet are configured to threadably couple with the first and second oil distribution lines, respectively, or the fittings therebetween.

A double sump oil pan includes a separator made of plastic that partitions the interior of the oil pan into an inner sump and an outer sump, a plate, and an elastically deformable sealing member attached to the plate. The sealing member closely contacts the inner wall of the oil pan and seals the outer sump. The plate and the separator are fixed to each other.

A double sump oil pan includes a separator made of plastic that partitions the interior of the oil pan into an inner sump and an outer sump, a plate, and an elastically deformable sealing member attached to the plate. The sealing member closely contacts the inner wall of the oil pan and seals the outer sump. The plate and the separator are fixed to each other.

A crankcase assembly for an engine comprising: a crankcase comprising a crank sump; the crank sump comprising primary and secondary sump volumes; one or more crankcase oil catchers, the crankcase oil catchers comprising surfaces to catch dispersed oil in the crankcase and direct the oil away from a crankcase casing wall and towards the crank sump, wherein the crankcase oil catchers are provided above a crankshaft and below a piston of the engine; and one or more guides to collect oil and guide the oil to the primary sump volume. At least a portion of the guide is movable between a first configuration in which the guide collects the captured oil that would otherwise have.

Embodiments are directed toward an engine. In some embodiments, the engine includes a water pump and a balancer shaft. In some embodiments, the water pump has a plain bearing. In some embodiments, plain bearing is supplied with pressurized oil. In some embodiments, the balancer shaft drives the water pump as well as cam shafts.

An internal combustion engine, having a cylinder crankcase delimiting a crank chamber and a lubricant pan accommodating a lubricant sump, which has a lubricant pan upper part arranged between the crank chamber and the lubricant sump and a lubricant pan lower part fastened on the lubricant pan upper part. Multiple ridges originate from a base component of the lubricant pan upper part in the direction of the lubricant sump, which ridges partially intersect and thus form chambers which are peripherally closed in section between them, and lubricant passage openings formed in the lubricant pan upper part open into at least part of the chambers, via which openings the crank chamber and the lubricant sump are fluidically connected.

An apparatus is described for heating oil for an internal-combustion engine. The apparatus includes a heat-exchanger arranged within an oil sump of the internal-combustion engine, which is flowed through or capable of being flowed through by a thermal medium for the purpose of emitting heat to oil in the oil sump. The apparatus further includes a heat-source in fluidic communication with the heat-exchanger, which is designed to heat the thermal medium outside the oil sump and outside the internal-combustion engine.