Thermostat unit

1. Slacken the fastening screws and remove the side protection on the exhaust side.
2. Remove the two fastening screws and remove the water pump complete with O-Ring.

• Refit reversing the sequence followed for removal.

For refitting the timing gear drive belt and timing and for assembly of the auxiliary components drive belt see GROUP 00.

THERMOSTAT UNIT

The thermostat unit is fitted on the rear end of the cylinder head.

Its purpose is to prevent the engine from exceeding the optimum temperature: until the coolant temperature reaches 83 °C, the thermostatic valve diverts the coolant fluid towards the pump; at higher temperatures, the opening of the thermostatic valve enables the passage of the fluid towards the radiator.

On the thermostat unit there is a sensor (NTC) for detecting the coolant temperature to be sent to the control unit.

1. Disconnect all the pipes connected to the thermostat unit.
2. Slacken the fastening screws and remove the thermostat unit.

REMOVING/REFITTING

• Remove the battery.

1. Drain the engine coolant fluid disconnecting the radiator delivery sleeve from the thermostatic cup.
2. Disconnect the electrical connection from the engine coolant temperature sensor (NTC).

RADIATOR

The radiator is sized to meet the heat dispersal requirements when the engine is running.

It comprises a radiant mass and two side reservoirs fitted with inlet and outlet unions for the coolant fluid; the pipes and radiant mass fins are in aluminium, the reservoirs are in plastic.