Automatic oil additive injector

An automatic oil additive injector for use in injecting a predefined volume of silicone fluid into engine lubricating oil during periodic oil service intervals thereof when an oil service component is installed, the injector comprising:

• a housing engaged to said engine having a passage which communicates with said engine lubricating oil, the housing including therein a reservoir of a fluid oil additive, pumping means disposed in said housing comprising a plurality of spring biased valves and a pumping member which coact to allow transfer of a predetermined discrete amount of said additive from said reservoir to said lubricating oil through said passage only upon said pumping member being operated by disengagement and engagement of said oil service component with said engine.

An automatic oil additive injector for use in injecting a predetermined volume of additive into an engine oil pan during periodic oil changes, said oil pan having a drain plug, the injector comprising:

• a housing engaged to a bottom wall of the oil pan and extending upwardly into the oil pan, the housing further having an additive reservoir, a central bore closed by said drain plug, and a radial channel extending from an intermediate portion of said bore which communicates with the lubricating oil, pumping means disposed in said housing bore including a plurality of spring biased valves and a pumping member having a portion disposed for engagement by said drain plug, the valves and pumping member coacting to transfer said predetermined volume of said additive from said reservoir of the injector upon operation of said pumping member by the disengagement and engagement of said drain plug.

An oil additive injector which automatically dispenses a predetermined volume of the additive into an engine oil pan whenever a drain plug is engaged within a central channel of the injector, the injector including a housing within which an additive reservoir is defined, the reservoir being in communication with the central channel through coacting valve assemblies, the injector including a radial throughbore therein which extends from the central channel and drains into the oil pan, and the valves coacting in a fixed primary and a slidable secondary manner where said primary valve assembly is operated to allow fluid flow therethrough when said secondary valve assembly drops to a lowermost position thereof, upon disengagement of the drain plug a chamber created between the valves filling with fluid and said secondary valve assembly being operated to allow fluid flow therethrough by raising of the valve assembly to an uppermost position thereof upon threaded engagement of the drain plug, an outlet of the secondary valve assembly being in communication with the radial throughbore.

An automatic oil additive injector for use in injecting a predetermined volume of additive into an engine oil filter assembly during periodic oil filter changes, said engine oil filter assembly having a removable filter, the injector comprising:

• a filter header housing having an additive reservoir, a pumping bore communicating with said filter, and a passage interconnecting the reservoir and pumping bore;
• a check valve mounted in said housing and disposed to permit additive flow from said reservoir to said pumping bore while preventing reverse flow;
• pumping means disposed in said pumping bore including a pumping member having a portion disposed for engagement by said filter, a spring-biased check valve disposed to permit additive flow from said pumping bore to said filter while preventing reverse flow, a pumping member having a portion disposed for engagement by said filter, the valves and pumping member coacting to transfer said predetermined volume of said additive from said reservoir of the injector upon operation of said pumping member by the disengagement and engagement of said filter.