46 AB Volvo Penta / Diesel Engine TAMD71B
10.3 Heat exchanger and
charge air cooler (CAC)
The TAMD71 has double heat exchangers con-
nected in series. The coolers are fitted on the
right of the engine, the heat exchanger(s) fore-
most.
In the heat exchanger, heat is transferred from
the engine’s inner cooling circuit (the freshwater
system) to its outer circuit (the raw water sys-
tem). In the CAC heat is transferred from the
charge air from the turbocharger to the raw
water. See also under “Charge air cooler“ in
chap. 7.10.
The cooler units are an aluminum housing with a
tubular cooling insert.
The raw water passes through the pipes, while
the freshwater (heat exchanger) or charge air
(for CAC) passes between the pipes.
Note! The heat exchangers and charge air cool-
ers are identical, so the cooling inserts, for ex-
ample, are interchangeable.
Fig. 10.6 Heat exchangers/radiator
and charge air coolers
A. Heat exchangers
B. Charge air coolers
C. Radiator
D. Charge air cooler
E. Fan cover
10.3.1Radiator and charge air
cooler (CAC)
The radiator is a liquid to air heat exchanger and
is a part of both the cooling water system and
the cooling air system. The hot coolant from the
engine passes trough tubes in the radiator and
is cooled by the cooling air from the fan.
The charge air cooler use the cooling air from
the fan to cool the charge air. The cooler is lo-
cated behind the radiator.
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