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Technical description
Cooling system
The engine uses a liquid coolant system and most engines incorporate a seawater cooled heat exchanger* in the sys-
tem. The coolant in the freshwater system is pumped round by the engine coolant pump. When the engine is cold the
coolant is directed through an inner circuit in the engine by the thermostats. When the engine reaches operating tem-
perature the coolant is directed into the heat exchanger where the excess heat is removed.
The seawater pump sucks in cooling water through the sea cock and then pumps it through the charge air cooler
(CAC) circuit and then on to the heat exchanger. The reverse gear is also cooled by seawater.
The freshwater pump and the seawater pump are driven via the timing gears.
The intake air to the engine is cooled in the charge air cooler (CAC).
A freshwater filter which is connected as a partial flow filter, maintains the correct pH value in the coolant and protects
the coolant system from clogging and corrosion.
* Note: TAMD162C and TAMD163A can also be delivered for connection to keel cooling systems.
Engine coolant flow when engine is cold Engine coolant flow when engine is at normal operat-
ing temperature
1. Seawater pump
2. Circulation pump
3. Seawater cooled heat exchanger
4. Expansion tank
5. Charge Air Cooler (CAC)
6. Thermostat housing with 2 thermostats
7. Coolant filter (freshwater)
8. Oil cooler
9. Distribution galleries for coolant
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