Working Principle of Oil Filter
Early production engines did not use oil filters, or even installed poor quality oil, which led to frequent oil changes. When the first full flow oil filtration system was invented, the problem was solved. Normally, the oil flows through the filter before reaching the moving parts inside the engine.
When oil enters the device through a series of small holes on the flange of the outer edge base, the operation of the oil filter is simple and easy to understand. The oil is cleaned through the filter and returned to the engine through a large central hole.
At present, most filters are designed with anti drainage return valve, most of which are in the form of rubber membrane. This part is usually located at the peripheral hole of the bottom flange. When oil enters the filter housing under pressure, the diaphragm opens. When the engine is stationary, this film will close the hole. The system valve keeps the oil in the filter to prevent the engine from becoming dry, which is to enable the engine to start without oil.
Modern internal combustion engines are equipped with a bypass filter, called a secondary oil filter. Under certain circumstances, they can protect the engine from starvation. For example, in very cold weather, they can cause the oil to thicken and bypass the oil filter to allow the oil to pass easily. The oil can also bypass the filter when the filter is plugged. This is because, even if there is a full flow filter in the engine, the oil will not be filtered sometimes.
