A pressurized pre-start engine oiling device for an internal combustion engine having an electrical ignition system that produces current in an on position and engages a starter in a start position and a lubricating system including an oil galley conduit pressurized by an oil pump to effect lubrication after the engine is started and when the engine is running and depressurized when the engine is not running and during the starting period, said device comprising:
- a main body having a first oil passageway and a piston chamber disposed adjacent thereto, an upper and a lower oil port disposed in said main body extending between said first oil passageway for conducting oil to and from said piston chamber,;
- an oil reservoir connected in fluid communication with said first oil passageway for containing a supply of oil under pressure;
- a first oil line connected at one end with said first oil passageway and connected at another end to said lubricating system between said oil pump and said oil galley conduit for conducting oil between said first oil passageway, said oil pump, and said oil galley conduit;
- a check valve in said first oil passageway disposed between said upper and lower oil ports and movable between an open position allowing oil under pressure to flow from said oil pump into said reservoir in response to oil pressure produced by said oil pump exceeding pressure in said reservoir and a closed position in response to oil pressure in said reservoir becoming approximately equal to the oil pressure produced by said oil pump;
- a solenoid valve means having an extendible and retractable piston with a piston head slidably disposed in said piston chamber and having an oil bypass port extending therethrough in axial alignment with said first oil port, said piston head spring biased to a normally closed position closing off flow of oil through said lower oil port and retracted upon said ignition system being turned to the on position;
- electronic timing and switch means connected with said solenoid valve means and said electrical ignition system to energize said solenoid valve means simultaneously upon said ignition system being turned to the on position and before engaging said starter and to deenergize said solenoid valve means after a preset time interval;
- said reservoir being initially filled with oil under pressure when said ignition system is turned to the start position to engage said starter whereby said piston head is retracted allowing a portion of oil flowing from said oil pump to said oil galley conduit to flow into said reservoir through said first oil line, said first oil passageway, said lower and upper oil ports, and said check valve, and after the preset time interval said piston head is spring biased to its closed position by said switch means shutting off current to said solenoid valve means thereby closing off flow of oil through said lower oil port and allowing oil to flow into said reservoir through said check valve as said oil pump continues pumping oil whereby air trapped in said reservoir compresses the oil therein;
- said check valve closing upon the oil pressure in said reservoir becoming approximately equal to the pressure produced by said oil pump to contain a charge of pressurized oil in said reservoir;
- thereafter
- said check valve opening in response to oil pressure produced by said oil pump exceeding the oil pressure in said reservoir and closing upon the oil pressure in said reservoir becoming approximately equal to the pressure produced by said oil pump to constantly maintain a charge of pressurized oil in said reservoir approximately equal to the greatest oil pressure produced by said oil pump when the engine is running and which does not drop when the engine is turned off and the lubricating system is depressurized;
- and
- when said ignition system is again turned to the on position and before it reaches the start position to engage said starter, said solenoid is energized by said timer and switch means to retract said piston head and allow said charge of pressurized oil to flow rapidly from said reservoir through said upper and lower oil ports, through said first oil line and into said oil galley conduit at a pressure approximately equal to the greatest oil pressure produced by said oil pump prior to the engine being turned off.