Garrett Report on Turbo Reconditioning

Always Genuine Parts – Reconditioned turbochargers: reasons not to use them

Download Garrett® Turbo Reconditioning Report

 

Summary of presentation contents

Index

  • Comparison between a Garrett® VNT™ turbocharger and a reconditioned VNT™ turbocharger
    • Case Study
    • Visual analysis
    • Component Comparison
    • Display
  • Comparison between a Garrett® turbo and a counterfeit turbo
    • What is the difference between a copy and a counterfeit turbo?
    • Visual Analysis
    • Component Comparison
  • How it affects engine performance

Case study

Visual analysis

Valve stem

The stem controls the movement of the variable geometry nozzle.

  • El vástago es una pieza crítica para el correcto funcionamiento del turbo y para el rendimiento del motor.

Valve Stem Surface Finish

Valve ( Dust and water seal )

Valve surface finish

Inside Valve

Reconditioned Valve – Potential Hazards

  • Seizure of the system that controls the movement of the blades and premature wear.
  • Rapid corrosion and failure of internal components.
  • Failure of the diaphragm in a short period of time.
    • No control on the VNT™ mechanism
    • Low engine performance
    • Excess emissions
    • Excess exhaust temperature
    • Engine damage
  • Spring breakage
    • Turbo may over-rev
      • Total failure and possible engine damage.
  • It is impossible to evaluate its service life

Exhaust Cone – Nozzle Ring

Exhaust cone – Contact surface

Adjacent to the blades

Nozzle ring

Poor surface finish

7 of 9 blades incorrect

  • Out of tolerances

Irregular dimensions

  • Out of tolerances

Blade tips bent inwards

  • Out of tolerances

POTENTIAL RISKS

Restriction of nozzle movement can cause permanent debris in the nozzle, reducing engine performance. Impacts turbo performance at low rpm, decreasing engine performance at low speed.

Exhaust segment

The segment is used to prevent oil and exhaust gases from leaving and entering the turbo.

The reconditioned turbo has a segment with incorrect clearance between tips.

  • Out of tolerances

Unknown material

POTENTIAL RISKS

Depends on operating conditions:

  • Exhaust gas inlet inside the turbocharger
  • Increased pressure in the turbo drain and crankcase
  • Oil leakage through the exhaust casing

Possible risk due to use of incorrect material

  • Segment deformation
  • Rotor contact

Plate

Screws overtightened

  • Damaged sealing area

Notes:

  • Honeywell chuck holes have a flat surface.
  • The Honeywell chuck screws have bosses that are driven into the flat aluminum surface of the chuck, achieving a perfect seal.

POTENTIAL RISKS

  • Oil leakage from the body to the inlet cowling
  • Oil contamination of the air intakes and intercooler
  • Oil burning during combustion
  • Out of specification emissions

Conclusion
Consequences on Engine Performance

Share this post:

TurboMaster s.l.
Mar Mediterráneo, 1 – Nave 7
28830 San Fernando de Henares
Madrid, Spain

Office hours
Mon-Fri de 9:00-13:30 & 15:30-19:00

Telephone numbers
+34 916 569 273 +34 916 569 288

© 1980-2019 TurboMaster S.L.

Spain’s official distributior

TurboMaster s.l.
Mar Mediterráneo, 1 – Nave 7
28830 San Fernando de Henares
Madrid, Spain

Office hours
Mon-Fri de 9:00-13:30 & 15:30-19:00

Now we are open

Telephone numbers
+34 916 569 273 +34 916 569 288

© 1980-2024 TurboMaster S.L.

Spain’s official distributior

210335