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What is the problem of oil seepage at turbine inlet pipe?

Release time: 2022-10-26

We know that when the engine is running, the gas from the crankshaft ventilation leaks out through the piston ring, which will carry the oil. If you take some gasoline with you, it will lead to oil burning.

A part called an oil and gas separator is needed, which separates the leaking gas carrying the oil into oil and air, and returns the oil to the oil pan. Today BMW's gas separator is integrated into the valve chamber cover.

We all know that, but the air that comes out of the oil and gas separator, separates the air from the turbine intake pipe, into the inlet. And then they burn together.

So, how does the separated gas get into the inlet?

First of all, the engine is now basically a supercharged engine, here only introduces the crankcase ventilation of the supercharged engine. Next, the ventilation path of B48 engine under pressurized mode is introduced: crankshaft channeling gas -- oil return channel -- oil and gas separator on valve chamber cover -- throttle check valve on valve chamber cover -- turbine inlet pipe -- inlet pipe

First of all, the air separated from the oil and gas separator is definitely not pure air. The air still holds some oil. After a long time of accumulation, there will be a slight oil leakage and accumulation phenomenon in the seal ring at the connection between the turbine and the air pipe. So why there is oil leakage in the turbine inlet pipe?

When driving at low load or short distances for a long time, this will also lead to incomplete oil separation in the cylinder head cover, and a small amount of oil will enter the turbine intake line through the crankcase vent.

There is also a possibility that the oil and gas separator inside the valve chamber cover is damaged, which can not separate the oil back to the oil pan, so as to directly enter the turbine intake pipe. There will be leakage in the turbine inlet pipe, in this case, there will be obvious burning oil.

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