Thermostat: Service and Repair

Removal

NOTE:
Removal of the thermostat would have an adverse effect, causing a lowering of cooling efficiency. Do not remove the thermostat, even if the engine tends to overheat.

1. Disconnect the battery terminals and remove the battery (A).
2. Remove the engine cover (B).
3. Disconnect the ECM connector (C).
4. Disconnect the breather hose and then, remove the air duct (D) and air cleaner assembly (E).

Tightening torque :
7.8 - 9.8N.m (0.8 - 1.0kgf.m, 5.8 - 7.2lb-ft)




5. Drain engine coolant so its level is below thermostat.
6. Remove the radiator lower hose (A).




7. Remove water inlet fitting (A) and thermostat (B).

Tightening torque :
7.8 - 11.8N.m (0.8 - 1.2kgf.m, 5.8 - 8.7lb-ft)




8. Installation is reverse order of removal.

NOTE:
Install the thermostat with the jiggle valve upward.

9. Fill the engine coolant.
10. Start the engine and check for leaks.
11. Recheck the coolant level.

Inspection

1. Immerse the thermostat in water and gradually heat the water.




2. Check the valve opening temperature.

Valve opening temperature:82°C (177°F)
Full opening temperature:95°C (205°F)

If the valve opening temperature is not as specified, replace the thermostat.
3. Check the valve lift.

Valve lift :8mm (0.3in.) or more at 95°C (205°F)

If the valve lift is not as specified, replace the thermostat.