Cooling system
2-58
Thermostat
In addition to the thermostat in each cylinder bank of the F350A (F350CC), a thermostat has been add-
ed to the crankcase and cylinder block for a total of 4 thermostats.
Because the cooling water passages have been divided into 2 sections that are controlled separately,
the engine temperature and output are stabilized, the warming-up time is reduced, the fuel consump-
tion is lower, and condensation in the lubrication system is prevented.
In addition, the high-temperature water that passes through the thermostats is discharged instead of
flowing through the cooling water passages, which reduces the amount of corrosion.
Specifications 1 2 3
Valve opening temperature
58–62 °C
(136–143 °F)
58–62 °C
(136–143 °F)
58–62 °C
(136–143 °F)
Fully open temperature 70 °C (158°F) 70 °C (158°F) 70 °C (158°F)
Fully open stroke 5.0 mm (0.20 in) 3.0 mm (0.12 in) 3.0 mm (0.12 in)
Diameter “a” 45.65 mm (1.797 in) 27.3 mm (1.075 in) 27.3 mm (1.075 in)
Flow rate at a pressure dif-
ference of 19.6 kPa (0.196
kgf/cm², 2.8 psi)
2.8 L/min 0.3–0.4 L/min 0.1–0.2 L/min
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