4-20 COOLING SYSTEM
Replace the O-ring [A] with a new one.
Apply grease to the O-ring, and install it.
Install the thermostat housing cover.
Note that the thermostat does not move at the place
when installing the thermostat housing cover.
Torque - Thermostat Housing Bolts: 5.9 N·m (0.60 kgf·m,
Apply a non-parmanent locking agent to the threads of
the water pipe bolt.
Torque - Water Pipe Bolt: 12 N·m (1.2 kgf·m, 106 in·lb)
Radiator (Water) Hose Clamp Screws: 2.9 N·m
(0.30 kgf·m, 26 in·lb)
Run the hoses correctly (see Cable, Wire, and Hose Rout-
ing section in the Appendix chapter).
Fill the radiator with coolant (see Coolant Change in the
Periodic Maintenance chapter).
Remove the thermostat (see Thermostat Removal), and
inspect the thermostat valve [A] at room temperature.
If the valve is open, replace the thermostat with a new
To check valve opening temperature, suspend the ther-
mostat [A] in a container of water and raise the tempera-
ture of the water.
The thermostat must be completely submerged and must
not touch the container sides or bottom. Suspend an ac-
curate thermometer [B] in the water so that the heat sen-
sitive 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)