2. The primary filter is in series between the oil pump and the main oil channel, so it is also called a full-flow filter to remove large impurities in the oil. It is mainly composed of upper cover, shell, paper filter element and bypass valve. When the engine is working, the lubricating oil with pressure is sent into the cavity around the filter element. The larger impurities in the oil are blocked by the paper filter element, while the clean lubricating oil enters the filter element's cavity and then enters the main oil passage of the cylinder block through the oil outlet.
　　3, fine filter: the function is to filter out smaller impurities in the lubricating oil, usually in parallel with the main oil channel, there are centrifugal and paper board.
　　This article is organized by dongguan oneness filtration technology co., LTD