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Air Induction Systems: Turbocharger: Inspection

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  1. Disconnect air intake tube and exhaust pipe from turbocharger. Rotate turbine wheel, shaft assembly and compressor wheel inside turbocharger. Shaft assembly should rotate smoothly. Perform STEP 1. See Figure.
  2. Push compressor wheel and shaft assembly as far in one direction as possible while rotating shaft assembly. Ensure compressor wheel does not contact compressor housing while rotating shaft assembly. Push turbine wheel and shaft assembly as far in opposite direction as possible while rotating shaft assembly. Ensure turbine wheel does not contact turbine housing while rotating shaft assembly.
  3. If compressor wheel or turbine wheel does not contact housing while rotating shaft assembly, bearings in turbocharger are okay. Go to next step. If compressor wheel or turbine wheel contacts housing while rotating shaft assembly, bearings in turbocharger are defective. Replace turbocharger.
  4. Install dial indicator so stem on dial indicator contacts end of shaft assembly at the compressor wheel. Perform STEP 2. See Figure. Push shaft assembly as far in one direction as possible and zero dial indicator. Push shaft assembly as far in the opposite direction and note shaft end play. Replace turbocharger if shaft end play exceeds .0010-.0040" (.025-.102 mm). Check control rod tension. Attach spring scale on control rod. See Figure. Adjust control rod length to obtain a reading of 10 lbs. (4.5 kg) on spring scale. Remove spring scale.


  1. If still attached, disconnect air intake tube and exhaust pipe from turbocharger. Rotate turbine wheel, shaft assembly and compressor wheel inside turbocharger. Shaft assembly should rotate smoothly. Perform STEP 1. See Figure.
  2. Push compressor wheel and shaft assembly as far in one direction as possible while rotating shaft assembly. Ensure compressor wheel does not contact compressor housing while rotating shaft assembly. Push turbine wheel and shaft assembly as far in opposite direction as possible while rotating shaft assembly. Ensure turbine wheel does not contact turbine housing while rotating shaft assembly.
  3. If compressor wheel or turbine wheel does not contact housing while rotating shaft assembly, bearings in turbocharger are okay. Go to next step. If compressor wheel or turbine wheel contacts housing while rotating shaft assembly, bearings in turbocharger are defective. Replace turbocharger.
  4. Install dial indicator so stem contacts end of shaft assembly at compressor wheel. Perform STEP 2. See Figure. Push shaft assembly as far in one direction as possible and zero dial indicator. Push shaft assembly as far in the opposite direction and note shaft end play. Replace turbocharger if shaft end play is not .0010-.0040" (.025-.102 mm). Check control rod tension. Attach spring scale on control rod. See Figure. Adjust control rod length to obtain a reading of 10 lbs. (4.5 kg) on spring scale. Remove spring scale.
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