Navistar MaxxForce DT Diagnostic Manual page 150

DIAGNOSTIC MANUAL
1. HP turbocharger compressor inlet
2. HP turbocharger turbine inlet
3. LP turbocharger wastegate
actuator
4. HP turbocharger
5. HP turbocharger wastegate
actuator
6. LP turbocharger
Figure 43 High and Low Pressure Turbocharger Components — Inner and Outer Views (MaxxForce®
Turbochargers
MaxxForce® 11 and 13 engines are equipped with a pneumatically regulated two-stage turbo charging system.
The HP and LP turbochargers are installed on the right side of the engine.
Intake air flow: Filtered air enters the LP compressor, where it is compressed and directed to the LPCAC
(if equipped). Cooled LP air enters the HP compressor where it is further compressed and directed into the
HPCAC. Compressed air then travels through the ETV and the intake throttle duct. This system provides high
charge air pressure to improve engine performance and to help reduce emissions.
Exhaust gas flow: The HP turbocharger is connected directly to the exhaust manifold through the HP turbine
inlet. Exhaust gases exit the HP turbine outlet and are directed to the LP turbine inlet. The HP and LP
turbochargers are equipped with wastegates, which are controlled by pneumatic actuators. When boost
demand is low, the wastegate is opened, allowing part of the exhaust gas flow to bypass the turbine.
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11 and 13 Engines)
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7. LP turbocharger turbine outlet
8. Oil supply line
9. Oil return line
10. LP turbocharger compressor
outlet
11. LP turbocharger compressor inlet
12. HP turbocharger compressor
outlet