Cleaning device for intake pipe passage of engine

1. Field of the Invention A cleaning device of an intake pipe passage of an engine provided with a container storing a washer; an air feed line with one end connected to a source of compressed air and with another end communicated with the inside of the container for feeding compressed air from the compressed air source to the inside of the container; a washer feed line with one end communicated with the inside of the container for supplying from the bottom of the container the washer compressed by the compressed air; a spray nozzle connected to the other end of the washer feed line; and a pilot valve interposed in the middle of the washer feed line and opened and closed cyclically by a cyclic pilot pressure generated by an air pulse circuit operating by air of an air source.