312000123 - 1088C WATER PUMP AND THERMOSTAT

Water pump

It is the centrifugal type with vanes secured to the crankcase and operated directly through the timing belt.
1. Water pump impeller2. Water pump casing3. Water pump drive pulley4. Water pump shaft5. Bearing6. 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. Cover2. Valve3. Air breather body4. Main spring5. Crosspiece6. Sensitive element7. Gasket8. Ball9. Pin10. Connector11. Temperature sender unit12. Air breather position