DV11
Operation and Maintenance
180
Maintenance of Major Components
Printed in Mar. 2005 PS-MMA0608-E1A
5. Maintenance of Major Components
5.1. Cooling System
5.1.1. General descriptions and main data
z 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.
z 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.
z 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 temperature 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.
Radiator
Cylinder block
Water pump
Thermostat
Oil cooler
Cylinder block
Cylinder head
Cylinder no.
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