2892425 - Introduction - ENGINE COOLING

-1, Water pump 2, Engine coolant temperature sensor (see DESCRIPTION AND OPERATION: 1056 PETROL INJECTION SYSTEM) 3, Thermostat 4, Radiator 5, Electric fan 6, Reservoir 7, Water pump rigid inlet pipe 8, Heater unitIn addition to supplying the system, the reservoir also absorbs the variations in volume of the cooling liquid, as the engine temperature varies.

Through a specific calibrated valve, contained in the pressurized cap:

• air emerges from the collection circuit from the pipe coming from the thermostat
• air enters when the circuit is in a vacuum (because of the engine cooling).

For leak test and test on pressurized cap   0510C30  cooling system - tightness test.

RADIATOR

This consists of a radiating mass and two side chambers acting as the coolant to inlet and outlet. The tubes and fins of the radiating mass are of aluminium, and the reservoirs are of plastic.

WATER PUMP

It is the centrifugal type with vanes, fixed to the crankcase and directly directly by the timing belt.

THERMOSTAT

Mounted on the rear of the cylinder head, its function is to keep the engine at the optimum temperature:

• at a temperature of < 83 ± 2°C, the (closed) thermostatic valve directs the coolant directly to the pump
• at a temperature of > 83 ± 2°C, the (open) thermostatic valve directs the coolant to the radiator.

Mounted on the thermostat, there is the coolant temperature sensor connected to the fuel injection control unit ( see DESCRIPTION AND OPERATION: 1056  PETROL INJECTION SYSTEM).

ELECTRIC FAN

The two speed electric cooling fan makes it possible to increase the dissipation of the heat from the radiator and/or the air conditioning system condenser.It is controlled directly by the injection control unit in accordance with a specific operating logic (  see DESCRIPTION AND OPERATION: 1056  PETROL INJECTION SYSTEM).