57
= Charge air or freshwater = Seawater
TAMD71: Engine coolant pump (circulation
pump) and thermostat housing
1. Piston thermostat
Thermostat function, cold engine
Thermostat function at operating temperature
Thermostat
The engines have a piston thermostat which has a
bulb filled with wax. When the engine is cold, the
thermostat keeps the route to the heat exchanger
completely closed. The coolant is then fed directly
back to the engine through a by-pass line. After the
engine has warmed up, the volume of the wax
increases and the thermostat subsequently opens
the route to the heat exchanger, while the by-pass
line is closed.
TAMD63, TAMD73, TAMD74: Flow through heat
exchanger
1. Expansion tank 4. Heat exchanger
2. Hot coolant from 5. Seawater inlet (from charge
engine’s thermostat housing air cooler)
3. Coolant to coolant 6. Seawater outlet (to reverse
pump suction side gear oil cooler)
1
4
6
5
2
3
2
5
3
4
1
TAMD63, TAMD73, TAMD74: Flow through charge
air cooler (CAC)
1. Charge air cooler (CAC) 4. Seawater inlet (from sea
2. Heated charge air from water pump)
turbocharger 5. Seawater outlet (to heat
3. Cooled charge air to the exchanger)
engine’s combustion chambers
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