COOLING SYSTEM 4-15

Thermostat

Thermostat Removal

•Remove:

Oil Cooler (see Oil Cooler Removal in the Engine Lubrication System chapter)

Thermostat Housing Cover Bolts [A] Thermostat Housing Cover [B] Thermostat

Thermostat Installation

•Install the thermostat [A] in the housing so that the air bleeder hole [B] is on top.

•Replace the O-ring [A] with a new one.

•Apply grease to the new O-ring.

•Install a new O-ring into the thermostat housing cover [B].

•Tighten:

Torque - Thermostat Housing Cover Bolts [C]: 5.9 N·m (0.60 kgf·m, 52 in·lb)

•Install the removed parts (see appropriate chapters).

Thermostat Inspection

•Remove the thermostat (see Thermostat Removal).

•Inspect the thermostat valve [A] at room temperature.

If the valve is open, replace the thermostat with a new one.

4-16 COOLING SYSTEM

Thermostat

•To check valve opening temperature, suspend the thermostat [A] in a container of water and raise the temperature of the water.

○The thermostat must be completely submerged and must not touch the container sides or bottom. Suspend an accurate thermometer [B] in the water so that the heat sensitive portions [C] are located in almost the same depth. It must not touch the container, either.

If the measurement is out of the specified range, replace the thermostat with a new one.

Thermostat Valve Opening Temperature

58 62°C (136 144°F)