A turbo that fails in service can send metal downstream or oil into the intake. Both are more expensive than the turbo itself. The useful skill is recognising the late stage while the wheels are still intact.
Late-stage signs
- Noticeable in-out or radial play at the shaft
- Oil film in the compressor outlet
- Scraping noises that change as the engine slows
- Sudden smoke with a drop in boost
If the wheel has already broken, do not keep running the engine to “see if it clears.” Inspect the intake and the exhaust for debris, then decide on the turbo and any damaged piping together.
Include the engine serial and whether the wastegate is electronic or pneumatic. Those are different parts.