DESCRIPTION OF COMPONENTS

2.4 JTD 10V, 2.4 JTD 20V

ENGINE COOLANT RESERVOIR - R.R.

Specifications

Function

In addition to supplying the circuit, the coolant reservoir absorbs the variations in the volume of the coolant as the temperature of the engine varies and condenses the coolant vapours thereby avoiding the need for refilling.

A special calibrated valve in the pressurised cap assures the following:

• escape of air from the circuit collected by the pipe coming from the thermostat
• air intake when the circuit contains a vacuum (due to engine cooling).

The maximum pressure reached by the engine cooling circuit is 1.4 bar.

ENGINE COOLING RADIATOR

Composition

Structure

It consists of a radiant mass and two side tanks for the intake and outlet of coolant.

The radiator pipes and fins are aluminium, the tanks are plastic.

2.4 JTD 20V

WATER PUMP

Specifications

Type

This is a centrifugal vane pump with an aluminium alloy casng and phenolic resin impeller.

Secured to the engine crankcase and driven directly by timing belt.

THERMOSTAT

Operation

General remarks

Fitted to the rear of the cylinder head and performs the function of maintaining the engine at optimum temperature:

• with the temperature %lt; 80 ± 2°C the termostatic valve (closed) directs the fluid directly to the pump
• with the temperature %gt; 80 ± 2'C the thermostatic valve (open) directs the coolant towards the radiator.

The engine coolant temperature sensor is fitted on the thermostat and is connected to the injection control unit and the instrument panel.

(See assembly ) 1060G

FANS

Specifications

Function

The two speed cooling fans make it possible to increase the capacity dissipate heat from the radiator and/or air conditioning system condenser.

They are controlled directly by the injection control unit in accordance with a specific operating logic [DF 1060].

Fan control

According to coolant temperature and coolant pressure in the air conditioning system, the engine control node communicates with the fan control interface to provide enablement for:

• fan activation at first or second speeds.

• 1 Engine coolant temperature multifunction control unit
• 2 Multifunction control unit cover

Engine coolant temperature control

The engine control node with coolant temperature higher than 105° C.:

• reduces injected fuel quantity (reduces engine power)
• controls the cooling fan via the fan control interface
• turns on the coolant warning light on the instrument panel.

2.4 20V

ENGINE COOLANT RESERVOIR - R.R.

Specifications

Function

In addition to supplying the circuit, the coolant reservoir absorbs fluctuations in coolant volume as engine temperature changes.

A special calibrated valve in the pressurised plug allows:

• the emergence of air from the collection circuit through a pipe leading from the thermostat.
• air intake when the circuit contains a vacuum (due to engine cooling).

ENGINE COOLING RADIATOR

Composition

Structure

This consists of a radiant mass and a side reservoir for coolant intake and outlet.

The radiant mass pipes and fins aer in aluminium. The reservoir is plastic.

WATER PUMP

Specifications

Type

This is centrifugal, vane type with an aluminium alloy pump casing and phenolic resin impeller.

Secured to the engine crankcase and driven directly by timing belt.

THERMOSTAT

Operation

General remarks

Fitted to the rear of the cylinder head and performs the function of maintaining the engine at optimum temperature:

• with temperature < 83 +/- 2°C the thermostat valve (closed) deviates fluid directly toward the pump.
• with temperature > 83 +/- 2°C the thermostat valve (open) deviates coolant directly toward the radiator.

The engine coolant temperature sensor fitted to the thermostat is connected to the injection control unit and control panel [DF 1056B].

FAN

Specifications

Function

The two-speed cooling fan increase the heat dissipation capacity of the radiator and/or air conditioning system condenser.

They are controlled directly by the injection control unit in accordance with a specific operating strategy [DF 1056B].

Fan control

According to coolant temperature and coolant pressure in the air conditioning system, the engine control node communicates with the fan control interface to provide enablement for:

• fan activation at first or second speeds.

• 1 Engine coolant temperature multifunction control unit
• 2 Multifunction control unit cover

Engine coolant temperature control

The engine control node with coolant temperature higher than 105° C.:

• reduces injected fuel quantity (reduces engine power)
• controls the cooling fan via the fan control interface
• turns on the coolant warning light on the instrument panel

2.4 JTD 10V

WATER PUMP

Specifications

Type

This is a centrifugal vane pump with an aluminium alloy casng and phenolic resin impeller.

Secured to the engine crankcase and driven directly by timing belt.

THERMOSTAT

Operation

General remarks

Fitted to the rear of the cylinder head and performs the function of maintaining the engine at optimum temperature:

• with the temperature %lt; 80 ± 2°C the termostatic valve (closed) directs the fluid directly to the pump
• with the temperature %gt 80 ± 2'C the thermostatic valve (open) directs the coolant towards the radiator.

The engine coolant temperature sensor is fitted on the thermostat and is connected to the injection control unit and the instrument panel.

(See assembly ) 1060G

FANS

Specifications

Function

The two speed cooling fans make it possible to increase the capacity dissipate heat from the radiator and/or air conditioning system condenser.

They are controlled directly by the injection control unit in accordance with a specific operating logic [DF 1060].

Fan control

According to coolant temperature and coolant pressure in the air conditioning system, the engine control node communicates with the fan control interface to provide enablement for:

• fan activation at first or second speeds.

• 1 Engine coolant temperature multifunction control unit
• 2 Multifunction control unit cover

Engine coolant temperature control

The engine control node with coolant temperature higher than 105° C.:

• reduces injected fuel quantity (reduces engine power)
• controls the cooling fan via the fan control interface
• turns on the coolant warning light on the instrument panel.

2.0 TB

ENGINE COOLANT RESERVOIR - R.R.

Specifications

Function

ENGINE COOLING RADIATOR

Composition

Structure

WATER PUMP

Specifications

Type

THERMOSTAT

Operation

General remarks

FAN

Specifications

Function

Engine coolant temperature control.

3.0 V6, 3.2 V6

ENGINE COOLANT RESERVOIR - R.R.

Specifications

Function

In addition to supplying the circuit, the coolant reservoir absorbs the variations in the volume of the coolant as the temperature of the engine varies.

The maximum pressure reached by the engine cooling circuit is 1.4 bar.

A special calibrated valve in the pressurised cap assures the following:

• emergence of air from the circuit collected by the pipe leading from thermostat.
• air intake when the circuit contains a vacuum (due to engine cooling).

ENGINE COOLING RADIATOR

Composition

Structure

This consists of a radiant mass and a side tank for coolant intake and outlet.

The radiator pipes and fins are aluminium, the tanks are plastic.

WATER PUMP

Specifications

Type

This is a centrifugal vane pump with an aluminium alloy casng and phenolic resin impeller.

It is secured to the crankcase and crankshaft-driven via a poly-V belt.

THERMOSTAT

Operation

General remarks

This is fitted to the gearbox end cylinder head and maintains the engine at optimum temperature:

• with temperature %lt; 87 ± 2°C, the thermostat valve (closed) directs fluid to the pump.
• with temperature %lt; 87 ± 2°C, the thermostat valve (open) directs fluid to the radiator.

The engine coolant sensor fitted to the thermostat is connected to the injection control unit and control panel [DF 1056].

FAN

Specifications

Function

The two-speed cooling fan increases the heat dissipation capacity of the radiator and/or air conditioning condenser.

They are driven directly by the injection control unit on the basis of a specific operating strategy [DF 1056].

Fan control

According to coolant temperature and coolant pressure in the air conditioning system, the engine control node communicates with the fan control interface to provide enablement for:

• fan activation at first or second speeds.

• 1 Engine coolant temperature multifunction control unit
• 2 Multifunction control unit cover

Engine coolant temperature control

The engine control node with coolant temperature higher than 105° C.:

• reduces injected fuel quantity (reduces engine power)
• controls the cooling fans via the fan control interface
• turns on the coolant warning light on the instrument panel.