Most of the cars on the market are wet oil sump, the reason why it is named wet oil sump is because the crankshaft crank and connecting rod head of the engine will be immersed in the lubricating oil of the oil sump once every rotation of the crankshaft, playing a lubricating role, and because of the high-speed operation of the crankshaft, each time the crank is immersed in the oil pool at high speed, it will stir up certain oil flowers and oil mist. Lubrication of the crankshaft and bearing is called splash lubrication.
In this way, the liquid level height of the lubricating oil in the oil pan has certain requirements, if too low, the crankshaft crank and connecting rod head can not be immersed in the lubricating oil, resulting in a lack of lubrication and smooth crankshaft and connecting rod and bearing shell; If the lubricating oil level is too high, it will lead to the entire bearing immersion, so that the crankshaft rotation resistance increases, and ultimately lead to the engine performance decline, while the lubricating oil is easy to enter the cylinder combustion chamber, resulting in engine oil burning, spark plug carbon accumulation and other problems.
