Removal And Installation

THERMOSTAT


Removal and Installation


REMOVAL
1. Drain engine coolant from radiator. Refer to Service and Repair.

CAUTION:
- Perform this step when engine is cold.
- Never spill engine coolant on drive belt.
2. Remove the air duct (inlet). Refer to Service and Repair.
3. Remove the radiator hose (lower) from the engine. Refer to Service and Repair.
4. Remove water inlet.
5. Remove thermostat.
6. Remove water pump, if necessary. Refer to Component Removal And Installation.
7. Remove thermostat housing, if necessary.

INSPECTION AFTER REMOVAL
- Place a thread (A) so that it is caught in the valves of thermostat





(1). Immerse fully in a container (B) filled with water. Heat while stirring.
- The valve opening temperature is the temperature at which the valve opens and falls from the thread.
- Continue heating. Check the full-open valve lift amount.

NOTE:
The full-open valve lift amount standard temperature for the thermostat is the reference value.
- After checking the full-open valve lift amount, lower the water temperature and check the valve closing temperature.





- If out of the specification, replace thermostat.

INSTALLATION
Installation is in the reverse order of removal.
- Use the following procedure to install the thermostat.





- Install thermostat while making rubber ring (1) groove fit to thermostat flange (A) around the whole circumference.

CAUTION:
Replace the rubber ring with a new one.





- Install thermostat (1) into the thermostat housing (2) with jiggle valve (A) facing upwards.
- Use the following procedure to install the thermostat housing.
- Securely insert the rubber ring into the mating groove of thermostat housing and install it.

CAUTION:
Replace the rubber ring with a new one.
- Install the thermostat housing to the cylinder block without displacing the gasket from the gasket position.

INSPECTION AFTER INSTALLATION
- Check that the reservoir tank cap is tightened.
- Check for leaks of engine coolant. Refer to Testing and Inspection.
- Start and warm up the engine. Visually check for leaks of engine coolant.