Interstage Cooler (Isc) - Navistar MaxxForce 15 Service Manual

18
Figure 9 Low and high-pressure turbocharger components
1. Low-pressure turbocharger
assembly
2. High-pressure turbocharger oil
supply hose
3. Air control valve
4. High-pressure turbocharger
assembly
5. High-pressure turbocharger
compressor inlet
The low and high-pressure turbochargers are installed
in series on the right side of the engine.
high-pressure turbocharger is connected directly
to the exhaust manifold through the high-pressure
turbine inlet. The turbine input of the low-pressure
turbocharger is connected to the turbine outlet of
the high-pressure turbocharger. The high-pressure
turbocharger is equipped with a wastegate actuator
which regulates turbocharger boost by controlling
the amount of exhaust gases that pass through the
turbine. When boost demand is low, the wastegate
opens, allowing part of the exhaust gas flow to bypass
the turbine.
ENGINE SYSTEMS
6. High-pressure turbocharger
turbine inlet
7. Low-pressure turbocharger
assembly
8. Low-pressure turbocharger oil
supply hose
9. Low-pressure turbocharger
compressor outlet
10. Low-pressure turbocharger
compressor inlet
Fresh air from the air filter enters the low-pressure
The compressor where it is compressed and directed into
the Interstage Cooler (ISC). Cooled condensed air
from the ISC enters the high-pressure compressor,
where it is further compressed and directed to the
High-Pressure Charge Air Cooler (HPCAC) mounted
near the cooling module. Cooled and condensed air
then flows directly into the engine throttle valve.

Interstage Cooler (ISC)

The ISC is installed between the low-pressure and
the high-pressure turbochargers. The ISC air inlet
11. High-pressure turbocharger
compressor outlet
12. High-pressure turbocharger
wastegate actuator
13. Turbine output pressure tube
14. Turbocharger oil drain tube
assembly
15. Low-pressure turbocharger
turbine outlet