Thermostat: Service and Repair

Engine Coolant Thermostat Replacement

Removal Procedure

Note:
The engine cooling system thermostat and water pump will not function correctly if oil is present in the cooling system.

The cooling system MUST be flushed, the water pump and thermostat replaced if oil is found in the cooling system.

1. Drain the cooling system. Refer to Cooling System Draining and Filling (GE 47716) Cooling System Draining and Filling (GE 47716)Cooling System Draining and Filling (Static Fill) Cooling System Draining and Filling (Static Fill).

2. Reposition the outlet hose clamp at the water pump inlet.

3. Remove the outlet hose from the water pump inlet.





4. Remove the water pump inlet bolts.

5. Remove the water pump inlet.

6. The O-ring seal is integral to the thermostat housing.

7. Remove the thermostat housing.

Installation Procedure

1. Install the thermostat housing.

2. Ensure the thermostat housing has an O-ring seal and is in the groove correctly.





3. Install the water pump inlet (with thermostat).

Caution:
Refer to Fastener Caution Fastener Caution.

4. Install the water pump inlet bolts.

Tighten the water pump inlet bolts to 15 Nm (11 lb ft).

5. Install the outlet hose to the water pump inlet.

6. Position the outlet hose clamp at the water outlet.

7. Fill the cooling system. Refer to Cooling System Draining and Filling (GE 47716) Cooling System Draining and Filling (GE 47716)Cooling System Draining and Filling (Static Fill) Cooling System Draining and Filling (Static Fill).