Diverter fittings for cooling systems of an engine

An engine block assembly, comprising:

• an engine block defining a block interior coolant passage;
• a cavity disposed in the engine block, the cavity comprising a receiving opening for receiving coolant, an inner opening that is in fluid communication with the block interior coolant passage, and an outer opening that is in fluid communication with an area exterior to the engine block;
• and
• a passive diverter fitting disposed in the cavity of the engine block, the passive diverter fitting comprising a base defining an interior cavity, an inlet opening, an outlet opening, and a bypass opening, wherein the inlet opening is in fluid communication with the receiving opening of the cavity of the engine block, wherein the outlet opening is in fluid communication with the outer opening of the cavity of the engine block, and wherein the bypass opening is in fluid communication with the inner opening of the cavity of the engine block, wherein
• the base comprises a cylindrical wall, an open first end, and a closed second end, wherein the inlet opening and the bypass opening each extend through the cylindrical wall, and wherein coolant received in the interior cavity of the passive diverter fitting via the inlet opening is split, such that a first portion of the coolant moves through the outlet opening and a second portion of the coolant moves through the bypass opening.

A cooling system, comprising:

• a pump for pumping coolant through the cooling system;
• an engine comprising an engine block, wherein the engine block comprises a block interior coolant passage, a cavity, and a return opening, wherein the cavity is in fluid communication with the block interior coolant passage and an area exterior to the engine block, wherein the return opening is in fluid communication with the block interior coolant passage and the area exterior to the engine block;
• a passive diverter fitting disposed in its entirety in the cavity of the engine block, the passive diverter fitting comprising a base defining an interior cavity, an inlet opening, an outlet opening, and a bypass opening, wherein the inlet opening extends through the base and is in fluid communication with the pump, wherein the outlet opening is in fluid communication with the inlet opening, and wherein the bypass opening extends through the base and is in fluid communication with the inlet opening and the block interior coolant passage;
• an external cooler having an inlet passage in fluid communication with the outlet opening of the passive diverter fitting and an outlet passage in fluid communication with the return opening of the engine block;
• and
• a radiator in fluid communication with the engine block and the pump;
• wherein the pump is configured to pump coolant through the passive diverter fitting such that a first portion of the coolant moves through the outlet opening of the passive diverter fitting and into the external cooler and a second portion of the coolant moves through the bypass opening of the passive diverter fitting and into the block interior coolant passage.