Pre-lubrication system for reducing engine wear

In combination with an internal combustion engine having an engine block with structure therein defining a pressurized lubrication system for circulating lubricant therethrough, a pressure sensing device, structure for normally mounting said pressure sensing device on said block in communication with said system for monitoring the pressure conditions therein including a passageway through a wall of said block communicating with said system and receiving said sensor, an ignition switch, and a starter for cranking the engine electrically connected with said ignition switch, a pre-lubrication assembly for said engine and comprising:

• an accumulator vessel including an inlet for receiving engine lubricant therein and having a bladder positioned within said vessel and filled with fluid under positive pressure, a filling nipple in operative fluid communication with said bladder and extending through the wall of said vessel for selectively charging said bladder with fluid, said bladder serving to subject engine lubricant contained in said vessel to positive pressure, said accumulator vessel further including a selectively openable drain plug for draining the contents of said vessel;
• a tee fitting including first, second and third intercommunicated tubular legs, said first leg being operatively received within said engine block passageway in lieu of said sensor for communication with said system, said pressure sensor being secured to said second leg for monitoring pressure conditions within said system;
• means for operably coupling said vessel and said system for at least partially filling said vessel with lubricant during operation of said pressurized lubrication system following an initial ignition sequence, for maintaining lubricant within said vessel when engine operation ceases, and for conveying lubricant from said vessel back to said system during a subsequent ignition sequence of said engine, said coupling means including a lubricant-conveying conduit operatively connected between said vessel inlet and said third tee leg, valve means interposed within said conduit for permitting selective flow of lubricant from said engine system to said vessel during engine operation, and for alternately permitting the flow of lubricant from the vessel to the system during said subsequent ignition sequence,
• said valve means comprising a solenoid-operated valve, there being means for operating said solenoid valve to permit said flow of lubricant from the vessel to the system during said subsequent ignition sequence, and a check valve in parallel with aid solenoid valve for permitting said flow of lubricant from said system to said vessel during operation of said engine;
• and
• an electronic timing device operably connected between said starter and said solenoid valve for opening said solenoid valve for a preselected period at the outset of said initial ignition sequence in order to deliver engine lubricant from said vessel to said engine, and for thereafter closing the solenoid valve after said preselected period has elapsed for maintaining the solenoid valve in a closed condition until a subsequent ignition sequence.