CASE 1- Turbocharger oil leakage
The turbocharger impeller rotates flexibly; there is no phenomenon of rubbing against the housing; there is no oil at the inlet of the compressor housing or the turbine housing while oil flows out at the outlets, as shown in figure below:
- There is no oil at the inlet of the compressor housing.
- There is oil at outlet of the compressor housing.
Reason:
In structure, the two ends of the turbocharger are equipped with metal seal rings, but these ara incomplete rings. The seal of the turbocharger also depends on the housing at the both ends when the engine is working normally(Picture 1). If the build-up pressure is greater than the pressure in the intermediate oil return chamber(Picture 2), the turbocharger will not leak oil. When this pressure balance is broken, even if the turbocharger is not damaged, oil leakage will happen at the outlet of the compressor.
-Situation 1:
The engine air filter is dirty, causing excessive negative pressure in the air inlet pipe.
-Situation 2:
The air inlet pipe is blocked, causing excessive negative pressure in the air inlet pipe.
-Situation 3:
The connecting pipe leaks between the outlet of the compressor housing and the inlet pipe of the engine.
-Situation 4:
The pressure in the crankcase is too high.
-Situation 5:
The crankcase breather is blocked.
-Situation 6:
The oil level in the crankcase is too high.
-Situation 7:
The airflow under the engine is too high.
-Situation 8:
The oil return pipe is bent or damaged, causing the oil return blocking.
-Situation 9:
There are carbon deposits in the intermediate oil chamber, or the oil return port is blocked.
-Situation 10:
The connection between the inlet of the volute pipe and the outlet of the exhaust pipe is leaking.
-Situation 11:
The customers have actions as list:
- Vehicles' idle time is too long than 20 minutes.
- Using the exhaust brake for a long time.
- The engine is in reverse towing condition suche as downhill for a long time.
*In addition to the above situation, other reasons cause oil leakage are not under the warranty either since this is an error caster during operation and installation.
ADVICES:
- If the air filter is dirty, clean the filter or replace it if necessary.
- If the air inlet pipe is blocked, clean or repair the pipe.
- If there is air leak, tighten the clamp or replace the pipe and the clamp.
- If the pressure in the crankcase is too high, it should be checked according to the engine manufacturer's instructions.
- If the crankcase breather is blocked, it should be repaired or replaced.
- If the oil level is higher than the mark, drain the excess oil to prevent the oil from blocking the oil return port of the turbocharger.
- For the airflow, checking and follow the engine manufacturer's instructions.
- If the oil return pipe is bent of deformed, it should be repaired or replaced. Also, Try to keep the oil return pope vertically downward.
- If there are carbon deposits or the oil return port is blocked, clean the oil chamber and the oil return port of the turbocharger.