Turbocharger Testing: Notes

NOTE: Each turbocharger has a unique noise level when operating. If sound raises and lowers, check for restrictions in air intake tube or dirt build-up in compressor housing or wheel. If a high-pitched noise or whistle occurs, check for air inlet or exhaust gas leak.

Remove exhaust outlet pipe from turbocharger housing. Using a mirror, observe wastegate movement while manually operating actuator linkage.
If wastegate fails to open or close, replace turbocharger assembly. Spin compressor wheel and check for binding. Replace turbocharger if binding exists.
Remove oil drain back tube from center housing. Check center housing for sludge in oil drain area. If center housing is heavily sludged or caked, replace turbocharger assembly.
Inspect compressor wheel and housing for signs of oil leakage, gouges, nicks or distortion. If damage or oil leakage is present, replace turbocharger assembly.