A cooling system for marine jet engines includes a marine jet engine assembly, a pressurized raw water inlet, a centrifugal filter, a strainer, and a hull-mounted heat exchanger. The marine jet engine assembly is configured with an engine, a drive shaft, a stator, a manifold heat exchanger, an exhaust, a water pump, and a coolant outlet so that the vessel can be functional. The pressurized raw water intake is in fluid communication with the stator. The centrifugal filter is in fluid communication with the pressurized raw water intake to supply a direct flow of raw water from the stator. The raw water is then cleaned through the strainer, discharged into a water inlet of the manifold heat exchanger, and discharged from a water outlet of the manifold heat exchanger before exiting into the exhaust. The hull-mounted heat exchanger is in fluid communication with the coolant outlet and the water pump.

A drive for a boat includes a housing that is arranged underwater during operation, and that houses an electric motor that drives a propeller. The housing includes a cooling section that includes a coolant duct.

A cooling device for a power source for a boat propulsion apparatus includes a cooling water passage. The cooling water passage includes a passage provided in the power source, in which an engine or an electric motor is used as the power source of the boat propulsion apparatus that propels a boat. Water from outside the boat is taken into the cooling water passage as cooling water to cool the power source, and the cooling water after cooling the power source is drained from the cooling water passage. From the cooling water flowing through the cooling water passage, foreign substances having a size that clogs the cooling water passage are removed. The cooling water passage is provided with a filter device which can filter residual foreign substances remaining in the cooling water.

A pod propulsion device includes: a pod configured to be disposed in water; a rotation shaft supported by the pod to be rotatable about a predetermined axis and having an end portion projecting out from the pod; a screw fixed to the end portion of the rotation shaft; an electric motor installed in the pod to rotationally drive the rotation shaft; multiple guide blades integrally formed on the pod to be arranged at intervals in a circumferential direction of the pod, each guide blade extending out radially from an outer surface of the pod; and a cooling circuit for cooling the electric motor, wherein the cooling circuit includes a cooling liquid passage formed to pass through an interior of at least one of the guide blades.

A bifurcating marine motor fresh water flush assembly comprising a wye having an inlet port and a manifold for distributing flow from the inlet port to each of a plurality of delivery ports. The wye further includes a valve for controlling flow through each delivery port. A supply line is connected to the inlet port. A delivery line connected to each delivery port. Each delivery line is connected to a flush port of a respective marine motor or an engine flusher. Flush water is provided to the inlet port, distributed to each open delivery port and forwarded to a respective marine motor to flush the motor accordingly. An engine flush intake adaptor assembly can be installed in each motor flush inlet connection, wherein a swivel connection of the adapter enables rotation when forming the union.

An outboard engine includes a steering mechanism having a pod propulsion device disposed in water outside a hull; a propulsive drive mechanism that is disposed in the hull and gives a propulsive drive force to the pod propulsion device; and a circulation cooling circuit which has an outward flow path that supplies a cooling oil to the steering mechanism and the propulsive drive mechanism, and an inward flow path which recovers the cooling oil from the steering mechanism and the propulsive drive mechanism, in which the inward flow path and the outward flow path of the circulation cooling circuit communicate with each other inside a case body of the pod propulsion device.

Provided is an energy storage system for a marine vessel. The energy storage system includes a battery pack and a storage container (i) configured for housing the battery pack and other components and (ii) including an electrical interface for electrically coupling the battery pack to the vessel. The energy storage system also includes an air blast cooling system (i) mountable to a first section of the container and (ii) for cooling the battery pack and an air conditioning system configured for cooling the other components.

A cooling system is for cooling a marine engine having an engine block and a cylinder head, and a supercharger configured to provide charge air for combustion in the marine engine. The cooling system has a charge air cooler configured to cool the charge air prior to combustion in the marine engine. The cooling system is configured to circulate cooling water from a body of water in which the marine engine is operating to the marine engine and then back to the body of water. The cooling system is further configured to convey the cooling water in parallel to the marine engine and the charge air cooler. A sprayer is configured to spray the cooling water into exhaust gas discharged from the marine engine. The cooling system is configured to convey the cooling water in series to the charge air cooler and then to the sprayer.

A cooling system for a boat includes at least one cooler located inside a hull of the boat and closed to the exterior of the hull. The cooler is configured for the exchange of thermal energy between a flow of coolant in the at least one cooler and a fluid flow outside of the hull via a hull wall positioned between the flow of coolant and the fluid flow. One or more coolant passages extend from the at least one cooler defining at least one coolant loop. The one or more coolant passages are configured to deliver the flow of coolant from the at least one cooler to one or more components located along the at least one coolant loop to cool the one or more components, and return the flow of coolant to the at least one cooler.

An exhaust system for a watercraft with an engine includes an upstream exhaust pipe including an end portion with an outlet, a water lock including an inner space accommodating the end portion, a downstream exhaust pipe connected to the water lock, and a flow direction diverter, such as a baffle. The upstream exhaust pipe guides exhaust gas from the engine to the end portion. The inner space of the water lock receives the exhaust gas from the outlet of the end portion. The downstream exhaust pipe exhausts the exhaust gas from the inner space to an outside of the watercraft body. The flow direction diverter changes a flow direction of the exhaust gas at the outlet to a cross direction which intersects a pipe axis of the end portion.