Abstract: An oil-pump-screen (1) cleaning method and apparatus with which an oil pan (3) of an internal-combustion engine (2) is drained by removal of a drain plug (7) from a drain aperture (15); the drain plug is reinserted in the drain aperture; a measured amount of a predetermined carbon-disintegrative liquid is put in the oil pan, preferably through a dipstick tube (10), to immerse the oil-pump pickup screen, but not the oil pump (41) without contacting engine bearings, gaskets, or other engine components that could be deteriorated or otherwise damaged by the carbon-disintegrative liquid. The cleaner liquid is left in the oil pan long enough, preferably about one hour, for it to disintegrate and dislodge all carbonic and other material from the oil-pump pickup screen while not running the engine or otherwise conveying the carbon-disintegrative liquid to other parts of the engine.

Abstract: An oil-pump-screen (1) cleaning method and apparatus with which an oil pan (3) of an internal-combustion engine (2) is drained by removal of a drain plug (7) from a drain aperture (15); the drain plug is reinserted in the drain aperture; a measured amount of a predetermined carbon-disintegrative liquid is put in the oil pan, preferably through a dipstick tube (10), to immerse the oil-pump pickup screen, but not the oil pump (41) without contacting engine bearings, gaskets, or other engine components that could be deteriorated or otherwise damaged by the carbon-disintegrative liquid. The cleaner liquid is left in the oil pan long enough, preferably about one hour, for it to disintegrate and dislodge all carbonic and other material from the oil-pump pickup screen while not running the engine or otherwise conveying the carbon-disintegrative liquid to other parts of the engine.