International HS 2.8L Service Manual page 18

International HS 2.8L
TURBOCHARGER
The turbocharger is compound of a rotary turbine
and a air compressor, located in opposite sides
of a same shaft. The compressor and turbine
rotors are covered by housing denominated
compressor and turbine, which function is to
direct the gases flow through the rotors shovels.
These gases having energy in pressure,
temperature and speed form, cause the rotation
of the turbine rotor and consequently of the
compressor rotor.
With the rotation, the atmospheric air (that must
be properly filtrate) is aspired, and later on,
compressed to the compressor rotor from where
goes to turbocharging (in turbocharged
International HS 2.8L engines) and later on to the
engine cylinders. Having a higher pressure in the
intake, the work done by the cylinders is positive,
in other words, the cylinders spent a smaller
amount of energy in the intake.
In turbocharged International HS 2.8L engine, the
turbocharger is also composed by a Wastegate
valve or VNT, which controls the maximum
pressure to be provided by the compressor, to
avoid damages in the engine.
Other advantage:
Existing a larger mass of air, we can fire a larger
amount of fuel, besides we get a better
combustion of the mixture.
The operation of an engine equipped with
turbocharger does not require any special
procedure.
Anyway, to assure the maximum durability of the
turbocharger, take care of these items:
To accelerate the engine immediately after
starting damages the turbocharger, because it
gets a high speed without the oil flow need on its
shaft.
To accelerate the engine before stop it, also
damages the turbocharger, because it stops the
lubrication but, on the other hand, the turbo shaft
still has a high speed.
INTERNATIONAL ENGINES
8120081 - 05/02 - Service Manual
Operation and Maintenance Recommendations
Exhaust
gases from
the engine
Exhaust
Turbine rotor
gases
Compressed air
Filtrate air
Compressor rotor
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