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Symptoms of a   turbocharger   not working? 

Symptoms of a turbo not working?(图1)

Turbocharger Oil leaking

Phenomenon 1:  The oil consumption is large, but the exhaust smoke color is normal, and the power is not reduced.

Cause: This condition is generally caused by engine oil leakage.


The external oil pipes of the engine lubrication system (including the turbocharger inlet and oil return pipes) should be checked for oil leakage;

Phenomenon 2: The oil consumption is large, and the exhaust emits blue smoke, but the power does not drop.

Cause: Due to the oil leakage at the end of the Turbocharger, the oil enters the combustion chamber through the engine intake pipe and is burned. There are the following possibilities:

>The oil return pipe of the Turbocharger is not smooth, and the oil accumulates too much at the intermediate supp-ort of the rotor assembly, and flows into the compressor impeller along the rotor shaft.

After the sealing ring or oil throwing ring near the end of the compressor impeller is damaged, the oil enters the impeller chamber from this, and then enters the combustion chamber through the inlet pipe together with the pressurized air in the chamber.


  • Open the air outlet of the compressor or the engine intake straight pipe (rubber hose), and check whether the nozzle and the wall of the pipe are oil adhered. If so, please check

  • Check whether the oil return pipe is unobstructed. If it is not smooth, it is caused by excessive oil accumulation at the intermediate su-pport, and the oil return pipe should be dredged and then installed.

  • If it is smooth, it is due to the damage of the impeller-end sealing ring or the Oil Flinger, and the Turbocharger should be disassembled for repair.

Phenomenon 3: The oil consumption is large, the exhaust emits blue smoke or black smoke, and the power drops.


  • The gap between the piston and the cylinder is worn too much, and the oil escapes into the combustion chambe -r and burned.

  • When the air is sucked in by the Turbocharger, the air flow encounters a large resistance. (For example, the air filter is blocked, the intake hose is sucked and deformed or flattened, etc.),the pressure at the air inlet of the compressor is low, causing oil leakage into the compressor, and the compressed air enters the combustion chamber and burns.


Check whether there is oil in the wall of the intake straight hose, and whether it is flattened, thus airflow is blocked or the air filter element is blocked.

Metallic rubbing noise

Phenomenon: Black smoke is emitted from the exhaust, power drops, and abnormal noise.


  • If there is metal friction sound, it is caused by excessive wear of the Shaft bearing or thrust bearing, and then cause the friction between the impeller and the impeller housing.

  • If it is not the sound of metal friction, but the sound of airflow, it is due to the high-speed rotation of the turbocharger rotor, the rotating sound, or the air leakage at the inlet and exhaust interfaces due to poor connection.


  • The first one be repaired by replacing damaged spare parts according to the wear and tear.

  • The second one should be carefully distinguished and targeted solutions.

Bearing damage failure

Phenomenon: Turbocharger bearing is damaged, the engine power is reduced, the oil consumption is high, black smoke is emitted, and tur-bocharger cannot work in serious cases.


  • Insufficient lubricating oil pressure and flow.

  • Insufficient supply of lubricating oil for shaft and thrust bearings;

  • Insufficient supply of lubricating oil for shaft and journal bearings;

  • Turbocharger running at high speed, and the lubricating oil has not been supplied in time.

  •  Debris or sediment enters the lubrication system.

  •  Oxidative deterioration of oil.

  •  Diesel oil is overheated, and too much gas passes between the piston and the cylinder wall;

  •  Cooling water leaks into the oil;

  •  Improper selection of oil and failure to change oil regularly as required.


  • Check whether the lubricating oil pressure is normal and whether the oil quantity meets the requirements.

  • Regularly replace the lubricating oil as required by the regulations, and ensure that the lubricating oil is clean.

  • Use lubricating oil in strict accordance with the regulations and do not mix them.

  • The engine should be prevented from working at high temperature and the normal working temperature of the engine should be ma-intained

If the above phenomenon occurs, the turbocharger should be disassembled for cleaning and the corresponding parts should be replaced. W-hen the turbocharger oil leakage is found, it is necessary to check whether the oil return pipe of the turbocharger and the ventilation pipe o-f the diesel engine are blocked, and whether the oil cooler works normally.

When the oil is found to be sludge-like, the oil filter should be replaced immediately in accordance with the regulations. Only in this way can the fault of the supercharger be eliminated and ensure that it works in good condition.

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