Equi-pressure pump for cleaning an engine

摘要

An engine cleaning pump includes two piston heads reciprocally and movably received in two separate sleeves. When pressured air enters to force the two piston heads to move to the left, cleaning solution sucked from the fourth connector is able to flow to the first connector to carry the contaminated oil out of the engine. When the two piston heads are moved to the right, the cleaning solution forces the third ball away to pass through the oil entrance to enter the internal of the engine so as to clean the inside of the engine.