Thermostat: Service and Repair

REMOVAL
Pre-removal Operation:
- Engine Coolant Draining.

Follow removal steps outlined in illustration.

INSTALLATION
Installation in reverse order as removal.

Installation Service Points





]A[ Thermostat Installation.
[SOHC]
Install the thermostat to the intake manifold as illustrated.

CAUTION: Be careful not to install the thermostat obliquely by fitting the thermostat flange in the spot facing provided in the intake manifold.

[DOHC]
Install the thermostat with its jiggle valve lined up with the mark on the thermostat housing.

Fig. 57 Installing Air Intake Hose "A":

]B[ Air Intake Hose A Installation.
Assemble the air intake hose A with its notches (arrow-marked) lined up with the marks on the air intake hoses B and C. Insert the hoses into the air intake hose A until they are bottomed.

Post-installation Operation:
- Engine Coolant Supplying.





INSPECTION
- Check that valve closes tightly at room temperature.
- Check for defects or damage.
- Check for rust or incrustation on valve, and remove if necessary.
- Immerse thermostat in container of water. Stir to raise water temperature and check that thermostat opening valve temperature and the temperature with valve fully open [valve lift-over 8 mm (0.31 inch)] are at the standard value.





NOTE: Measure valve height when fully closed. Calculate lift by measuring the height when fully open.