Reasons for Shaft Breakage (Rims & Axle of Turbocharger)

1. Foreign object damage (most common)

   Debris, broken filter pieces or metal scraps sucked into intake damage compressor wheel; broken valve fragments in exhaust hit turbine wheel, leading to shaft fracture.
2. Poor lubrication / oil starvation

   Insufficient engine oil or clogged oil passage damages floating bearings. Shaft runs eccentric, seizes under high heat and snaps from torsion.
3. Turbo overspeeding

   Engine runaway or faulty fuel injection causes excessive turbo RPM, exceeding material tensile limit and breaking the shaft.
4. Thermal fatigue

   Persistent excessive operating temperature and poor cooling induce metallurgical change of shaft material; repeated thermal expansion & contraction causes fatigue cracking.
5. Unbalanced rotation

   Chipped or damaged impeller ruins dynamic balance. Continuous high-frequency vibration results in fatigue fracture over time.

Quick Inspection Tips

• Nicks on impeller: Broken by foreign matter
• Blued/scuffed shaft journal: Breakage due to oil starvation & seizure