Intake And Exhaust Systems; Design And Function; Charge Air Cooler; Turbocharger - Volvo Penta TAD1630G Workshop Manual

Group 22

Intake and exhaust systems

Charge air cooler

The TAD1630 and TAD1631 are equipped with an air to air
charge air cooler. The purpose of the cooler is to lower the
temperature of the intake air before it is blown into the engine
cylinders.
TWD1620, TID162, TWD1630 and TD164KAE is equipped
with a charge air cooler of the water to air type.
The charge air cooler (intercooler) lowers the air temperature
by about 100°C (TWD) and 150°C (TAD) respectively and
increases engine output. Engine torque is also higher and
fuel consumption is lower.
On the TAD1630 and TAD1631 the charge air is cooled
when it is passing the charge air cooler which is placed be-
hind the engine's cooler. The air is pressed from the turbo-
charger through the charge air cooler and into the inlet mani-
fold (air to air cooling).
On the TWD1630 the charge air is cooled by the water
cooled charge air cooler placed on top of and on the right
hand side of the engine (water to air cooling).

Turbocharger

The turbo unit is of type:
TAD1630, TAD1631 – Schwitzer S4T
TWD1620, TID162 – Holset HSB0870/B36
TWD1630 – Holset H3B
TD164KAE – Garret TV75
The turbocharger is powered by the exhaust gases which
pass through the turbine housing to reach the exhaust sys-
tem. The passage of the exhaust gases causes the turbine
wheel to spin. On the same shaft as the turbine wheel is a
compressor wheel. The compressor wheel spins in a com-
pressor housing which is connected between the air filter and
the engine's inlet manifold.
As the compressor wheel rotates, air is sucked in from the
air cleaner. The air is compressed by the compressor wheel
and is forced into the engine cylinders.

Design and Function

Intake and exhaust systems
109