ENGINE SYSTEMS 21
Variable Geometry Turbocharger (VGT)
Figure 13 Variable G eometry Turb
ocharger (VGT)
1. Turbine outlet
2. Oil supply port
3. Compressor outlet
4. Compressor housing
5. Turbine inlet
6. Turbine housing
7. Oil drain port
8. Compressor inlet
9. Electrical connector and wire
10. Turbocharger control module
11. VGT linkage
The Variable Geometry Turbocharger (VGT) has
actuated vanes in the turbine housing. The vanes
modify flow characteristics of exhaust gases through
the turbine housing. The benefit is the ability to control
boost pressure for various engine speeds and load
conditions. An additional benefit is lower emissions.
VGT Closed Loop System
Figure 14 VGT closed loop system
The Variable Geometry Turbocharger (VGT) is a
closed loop system that uses the Exhaust Back
Pressure (EBP) sensor to provide feedback to the
ECM. The ECM uses the EBP sensor to continuously
EGES-265-2
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
Follow all warnings, cautions, and notes.
© 2009 Navistar, Inc.
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