3 ENGINE 3 ENGINE
EF494T TM 06/2011 edition
<Radiator (with sub-tank)>
Sub-tank
The sub-tank is used to store evaporated cooling
water, thereby preventing cooling water from
being consumed.
(A) Sub-tank
(B) Supply port
(C) Upper limit
(D) Lower limit
Radiator cap
When the internal pressure of the radiator rises
because of an increase in water temperature, the
valve opens to send water vapor to the sub-tank
to prevent the radiator from deforming or
otherwise changing.
When the water temperature decreases, the
valve closes, the internal pressure of the radiator
becomes negative, and then the water in the sub-
tank is sucked back to the radiator.
(A) From sub-tank
(B) To sub-tank
(C) When vapor pressure decreases
(D) When vapor pressure increase
(E) Water is sucked from the sub-tank back to the
radiator.
(F) Steam is sent to the sub-tank.
Checking a leak from the radiator or engine
cylinder block
(1) Remove the radiator cap and add cooling
water until it is full.
(2) Install the tester.
(3) Apply a pressure of 1.0-1.2 kgf/cm
2
.
(14.2-17.0 lb/sq.in)
CAUTION
Too much pressure can damage the hose and
radiator.
(4) Leave for approximately 10 minutes while
watching the gauge on the tester.
(5) A falling reading means that there is a leak.
Check the radiator and internal engine
parts (gaskets, seals, etc.).
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