Description

DESCRIPTION

The cooling system is sealed and of the forced circulatio type. It features a centrifuge pump (1) operated by the crankshaft by means of a Poly-V belt.

A thermostat valve (6) located on the rear of the engine ensures optimal engine temperature. It opens when the coolant reaches a temperature of 87 ± 2°C.

The radiator (4) cools the fluid by means of dynamic air and a two double speed fans. The fans are controlled by a thermal contact (5) located on the radiator. An additional resistance and a relay operate the fans at higher speed when the temperature is high.

The expansion reservoir (3) feeds the circuit if the level decreases and absorbs the fluid variations in volume according to the temperature. Furthermore, it acts as a circuit air bleeder.

The circuit is equipped with an engine coolant temperature sensor (8) for the gauge and a maximum temperature thermal contact for the warning light up when the coolant temperature exceeds 115°C.

CIRCUIT OPERATION

The fluid cools the engine and reaches the thermostat (5) via the cylinder head. If its temperature is lower than 87°C the coolant is sucked by the pump (1) via a longitudinal return manifold located between the two cylinder heads.

If the temperature is higher than this values, the coolant is conveyed to the radiator (4) via the thermostat opening.

After being cooled in the radiator, the coolant returned to the thermostat from where it is conveyed to the pump via the longitudinal manifold.

A specific fitting (9) on the right-hand cylinder head receives the coolant from a suppelementary duct on the head and sends it via two specific pipes to the climate control system heater (10) and to the throttle casing for heating it.

The throttle is connected to the expansion reservoir (3) by means of a specific pipe which ensures fluid return and also bleeds the system.