4.9.7 Crankcase ventilation
Most modern cars are equipped with forced ventilation systems for crankcase gases. Such a system usually includes valves and pipes that connect the crankcase cavity to the intake manifold.
The crankcase ventilation itself is extremely important for the normal operation of the engine. The fact is that one way or another, the exhaust gases enter the engine crankcase through the gaps of the piston group. Gases are also created when engine oil comes into contact with hot engine parts. The escaping exhaust gases dilute the engine oil while acting on it. This leads to a decrease in service life and a loss of efficiency. Depending on the operating mode of the engine, gases that are trapped inside the crankcase can sharply increase the excess pressure. This will lead to the squeezing out of the sealing cuffs (oil seals) and gaskets. This is why manufacturers install electronically controlled valves, which are responsible for crankcase ventilation.
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