WATER PUMP AND THERMOSTAT

Description 1088C

1.2 8v, 1.4 16v

Water pump

It is the centrifugal type with vanes secured to the crankcase and operated directly through the timing belt.

1. Water pump impeller

2. Water pump casing

3. Water pump drive pulley

4. Water pump shaft

5. Bearing

6. Mechanical seal

Thermostat

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

• with the temperature < 88 ± 2°C the thermostat valve (closed) deviates fluid directly toward the pump.
• with the temperature > 88 ± 2°C the thermostat valve (open) deviates coolant directly toward the radiator.

The engine coolant temperature sensor is fitted on the thermostat and is connected to the injection control unit (see 1056).

1. Cover

2. Valve

3. Air breather body

4. Main spring

5. Crosspiece

6. Sensitive element

7. Gasket

8. Ball

9. Pin

10. Connector

11. Temperature sender unit

12. Air breather position

1.3 Multijet

WATER PUMP

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

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

1. Metal insert

2. Pulley

3. Shaft

4. Plug

5. Pump casing

6. Dynamic seal

7. 6 vane impeller

8. Metal insert for impeller

9. Gasket

THERMOSTAT

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

• with temperature < 80 ± 2°C the thermostat valve (closed) deviates fluid directly toward the pump.
• with temperature > 80 ± 2°C the thermostat valve (open) deviates coolant directly toward the radiator.

A. By-pass valve travel (9 ± 0.5 mm max)

1. Thermostat casing

2. Main filler (to the radiator)

3. O-ring seal

4. Seal

5. Sensitive element

6. Pin

7. Main valve

8. Main spring

9. By-pass spring

10. Crosspiece

11. By-pass valve

12. Gasket

13. Engine coolant filler to water/oil heat exchanger

14. Engine coolant filler to EGR and passenger compartment heater

15. Engine coolant temperature sensor

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

See descriptions 1060G DIESEL INJECTION PRESSURE PUMP ELECTRONIC CONTROL