The turbocharger needs lubrication due to its high rotational speeds.

High rotational speeds generate much heat, so adequate oil flow and cooling are crucial to prolong the turbocharger's life.

What are the most common causes for Turbocharger breakdowns?

Damage from foreign objects (often in suction)

• Engine fragments, such as valve pieces, can hit the turbine wheel, but poor air filter maintenance can allow particles (of sand, gravel, and other impurities) to enter the turbo by hitting the compressor wheel's propellers.
• Damage to the propellers causes turbine imbalance.
• Generating vibrations over time leads to severe damage and turbo failure.
• On-site turbine inspection may not always be feasible, so ensure the engine is in good health, with quality air filters in good condition, to help prevent premature damage.
• If you can inspect the turbine (by removing the intake sleeve), quickly check its condition by moving the turbine up and down. Excessive play or any chipping and marks on the turbine propellers indicate a balancing problem.
• In these situations, overhauling or replacing the turbocharger is highly recommended to prevent damage to other engine components.

Sudden engine shutdown at high RPM and/or without a cooling down period

It's important to shut off the engine when idling, giving the turbocharger a chance to cool down for a few seconds (30 to 40 sec.).

This short period lets the cooling system dissipate heat from the turbine and assembly, preventing temperatures > 900°C from persisting inside the turbocharger, causing carbonization due to heat transfer.

Improper warm-up of a turbocharged engine is also important, as excessive expansion rate with a cold engine can cause component cracks due to thermal shock. Respecting engine warm-up and cool-down times is crucial to avoid premature damage.

Overheating

Turbocharged engines reach much higher temperatures than older naturally aspirated engines → + Power = + Heat. Excessive heat can rupture or deform the heat shield and turbine housing, deforming the turbine or melting/carbonizing components. To avoid this, keep engine compartment air passages clear by properly cleaning the radiators and hood grilles.

Low level or lack of engine oil

Due to the high rotational speeds of the turbine (>100,000 rpm), a lack or shortage of lubrication oil, even for a fraction of a second, can cause serious costly damage.

• Non-compliance with engine oil change times
  A turbocharger is not a sealed system, oil can leak out of the bearing housing, allowing exhaust gases to enter the oil. If engine oil isn’t changed often enough, combustion deposits from the exhaust can build up in the oil, changing its viscosity. If this happens, oil flow within the turbocharger is reduced, potentially blocking the turbine.
• Lubrication circuit problems
  Check the lubrication system for visible damage and/or obstruction.
• Using the correct lubrication fittings
  Ensure the lubrication circuit fittings are correct for the turbocharger, so as not to restrict oil supply to the main body bearings.

Incorrect engine design

Many turbochargers are prone to failure when the engine isn't quite suitable for the application. This can occur when too-small engines are used on very heavy vehicles or when small engines have developed too much horsepower. This leads to excessive lubrication oil pressures, potentially causing turbine shaft failure.

Indicator signs of a defective turbocharger

• Excessive engine oil consumption
  Can result from worn turbo seals, which let oil pass into the intake system.
• Overconsumption of fuel
  The stoichiometric ratio (air/fuel mixture) of turbocharged engines is very precise. If the turbocharger isn’t working properly, it can vary the ratio, bringing incorrect airflow. This results in worse combustion and higher fuel consumption.
• Bluish smoke
  The bluish color of exhaust gas indicates oil combustion. If the problem stems from the turbocharger, blue smoke will occur both at engine idle speed and during standard operation.
• Engine oil leaks
  Oil leaks near the intercooler clamps may depend on long periods of engine downtime. However, if leaks don't cease during use, it's advisable to check the turbocharger condition.
• Excessive and/or prolonged turbocharger “whistle”
  The turbocharger generates high airflow, creating a “whistle” that, if constant or very high-pitched, indicates a defect in the bearing assembly or turbine. Should this happen, it's advisable to inspect the turbocharger condition.
• Loss of power
  Most power from a turbocharged engine comes from the turbocharger itself. If damaged, there's significant performance loss.

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