Daewoo DE12T Manual page 156

6.2. Cooling System
6.2.1. General information
This engine is water-cooling type. Heat from the combustion chamber and engine oil heat are
cooled down by coolant and radiated to the outside, resulting in the normal operation of the
engine.
Looking into the cooling system, the water pumped up by the water pump circulates around
the oil cooler through the water pipe to absorb the oil heat, and then flows through the water
jacket of the cylinder block and water passage of the cylinder head to absorb the heat of the
combustion chamber.
The water absorbing the oil heat and combustion chamber heat goes on to the thermostat
through the water pipe, and circulates to the water pump if water temperature is lower than the
valve opening temperature on the thermostat, while circulating to the radiator at water tem-
perature higher than the valve opening temperature. At the radiator, the heat absorbed in the
coolant is radiated to cool down and the coolant recirculates to the water pump.
6.2.2. Specification
1. Water pump
2. Thermostat
3. Cooling fan and belt
MAINTENANCE OF MAJOR COMPONENTS
Thermostat
Water pump
Air compressor
Description
Type
Delivery
Pumping speed
Pumping back pressure
Operating temperature
Fan diameter - Number of blades l812.8 mm - 9
Fan belt tension
- 152 -
Water pipe
Cylinder head
Cylinder block
Oil cooler
Specification
Centrifugal type
About 350 liter/min
2,100 rpm
760 mmHg
71 ~ 85°C
15 mm / deflection by thumb
EQM4001I