Cooling System; Engine Cooling - Cagiva Navigator Workshop Manual

COOLING SYSTEM

DESCRIPTION
The engine is cooled by an engine coolant that is pumped by force around the cooling system. The engine coolant passes
through the water jackets that are present in the cylinders, the cylinder heads and the radiator. The type of pump used to
pump the engine coolant around the cooling system is a high-pressure centrifugal pump. The radiator is made of aluminium
that is light and readily dissipates heat. It is constructed of tubes and fins.
The thermostat is a wax pearl type thermostat and is supplied with a valve for the control of the flow of engine coolant on
the basis of the temperature. The thermo-sensitive wax pearl activates the valve.
In the following figure, the thermostat is in the closed position and therefore the engine coolant circulates in a controlled
condition according to the pump, the engine, the by-pass holes of the thermostat and the radiator.
When the temperature of the engine coolant reaches approximately 50°C. and the valve of the thermostat starts to open,
a normal flow of engine coolant is created. At approximately 65°C., the thermostat opens completely and the major part
of the heat is dissipated in the atmosphere via the radiator.

ENGINE COOLING

THERMOSTAT
TANK
RADIATOR
N° 1 CYLINDER HEAD
N° 1 CYLINDER
WATER PUMP
N° 2 CYLINDER
N° 2 CYLINDER HEAD
H.3