D7A TA KC (1½-circuit)
Drain points HT-circuit
Drain points LT-circuit
The engine cooling water is cooled by, e.g, a box
cooler, a grid cooler, or any other external heat
exchanger. When the coolant temperature in the HT-
circuit is too high the thermostat valve opens and
allows water of a lower temperature from the LT-
circuit to enter the HT-circuit.
The HT-circuit is cooling the cylinder liners, the
cylinder heads, and the lubrication oil.. An engine
driven HT-pump circulates the coolant through the
engine.
The LT-circuit is cooling the charge air. An engine
driven LT-pump circulates the coolant through the
CAC.
1 Engine
2 HT-pump
3 Thermostat valve
4 Expansion tank
5 LT-pump
6 Charge air cooler
7 HT-circuit
8 LT-circuit
Maintenance
78 47713337 03-2021 © AB VOLVO PENTA
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