Closed loop fluid cooling system for marine outboard, inboard, and inboard-outboard motors

A marine vessel having a motor for propelling the marine vessel, the motor having a fluid cooling system, the improvement comprising:

• a motor cooling circuit in fluidic communication with fluid cooling jackets proximate to the motor;
• a heat dissipation circuit;
• the motor cooling circuit in closed fluidic communication with the heat dissipation circuit;
• a cooling fluid that circulates between the motor cooling circuit and the heat dissipation circuit;
• a heat dissipation member in fluidic communication with the heat dissipation circuit to receive the circulating cooling fluid, and the heat dissipation member submerged in a body of water on which the marine vessel is afloat to transfer heat from the cooling fluid to the body of water;
• and
• a thermostatic control comprising a heat dissipation mode for operating the cooling system and a heat preservation mode for operating the cooling system, wherein the heat dissipation mode permits or causes flow of the cooling fluid from the motor cooling circuit to the heat dissipation circuit and the heat preservation circuit stops flow of the cooling fluid from the motor cooling circuit to the heat dissipation circuit.

A method of controlling an operating temperature of a marine motor, comprising:

• providing a cooling system for the marine motor, comprising:
• a motor cooling circuit in fluidic communication with fluid cooling jackets about proximate to the marine motor;
• a heat dissipation circuit;
• the motor cooling circuit in closed fluidic communication with the heat dissipation circuit;
• a cooling fluid that circulates between the motor cooling circuit and the heat dissipation circuit;
• a heat dissipation member in fluidic communication with the heat dissipation circuit to receive the circulating cooling fluid, and the heat dissipation member submerged in a body of water to transfer heat from the cooling fluid to the body of water;
• and
• a temperature control valve in fluidic communication with the motor cooling circuit and the heat dissipation circuit;
• actuating the temperature control valve to permit flow of the cooling fluid from the motor cooling circuit to the heat dissipation circuit;
• and
• actuating the temperature control valve to shut off flow of the cooling fluid from the motor cooling circuit to the heat dissipation circuit.