Coolant filter having a delayed release supplemental coolant additive cartridge

A coolant filter for a diesel engine, the coolant filter adapted to add a chemical additive to the coolant to minimize the cavitation erosion effects of coolant passing by vibrating cylinder liners of the diesel engine, the filter comprising:

• an outer housing defining a filter chamber, the outer housing being substantially cylindrical with a closed end and an open end closed by a baseplate, the baseplate including concentric inlets and outlets;
• a chemical additive cartridge mounted within the outer shell, the cartridge being substantially cylindrical with an open end and a closed end, the open end being closed with an end cap, the cartridge being filled with a supplemental coolant additive to be released into the coolant being filtered, the cartridge including an air vent and an outlet orifice to allow the additive to be released, the cartridge including a restriction orifice isolated from the coolant additive;
• and
• a filter cartridge mounted around the chemical additive cartridge and inside the outer housing, the filter cartridge being downstream of the chemical additive cartridge, coolant to be filtered entering the filter through the baseplate inlet and passing by the chemical additive cartridge outlet, the chemical additive thereby being added to the coolant, the coolant containing the additive then passing through the filter cartridge and exiting through the restriction orifice and baseplate outlet.