Patent ID: 6263889
Filing Date: 2001-07-24
Classification: F01M,F02B

Abstract:
An engine oil system cleaning apparatus, comprising:a solution delivery line having one end connected with a cleaning solution reservoir and an opposite end connected with the engine interior,a pump for pumping solution via the solution delivery line from the solution reservoir to the engine interior,a solution drain line having one end connected with an engine oil pan and an opposite end connected with the cleaning solution reservoir,a pressure sensitive device in the solution delivery line to generate a signal in response to a predetermined pressure drop in the solution delivery line,a filter and an exit line connected with the engine interior and with the solution drain line to conduct to the solution reservoir cleaning solution pumped by the engine oil pump,a return valve disposed in a solution return line and adapted to close in response to said signal from the pressure-sensitive device, anda loop valve disposed between the exit line and the solution return line and adapted to open upon said signal from the pressure-sensitive device and closure of the return valve to pass solution to the solution delivery line to the engine,whereby a closed loop fail-safe cleaning solution flow circuit is provided, comprising the exit flow line, the solution return line, and the engine pump to maintain cleaning solution flow to and from the engine in the event of a predetermined pressure drop in the cleaning solution delivery line.