Cooling Water System; Flow Of Cooling Water; Main Components - Yanmar EF-494T Technical Manual

3 ENGINE
3.4

COOLING WATER SYSTEM

3.4.1

Flow of cooling water

(A) Cylinder head
(B) Cylinder block
(C) Bypass
(D) Cooling water pump
(E) Thermostat
(F) Radiator
(G) Sub-tank
3.4.2

Main components

<Thermostat>
Maintains a constant temperature for the cooling
water, thereby preventing the engine from being
excessively cooled. If the water temperature is
low, the valve closes to circulate cooling water
without sending it to the radiator. If the water
temperature increases, the valve opens to send
cooling water to the radiator.
Thermostat
Temperature at which the
valve is opened
Temperature at which the
valve is fully opened
Valve lift
85°C
95°C
8mm minimum
93
(A) Thermostat
(A) Thermometer
(B) Heater
3 ENGINE
EF494T TM 06/2011 edition