Radiator; Outline Of Radiator; Structure Of Radiator; Function Of Radiator - Kubota D1803-CR-E4 Workshop Manual

MECHANISM
7. Cooling system
Valve opening
Code number
temperature
80.5 to 83.5 ℃
1J801-73011
176.9 to 182.3 ℉

7.7 Radiator

7.7.1 Outline of radiator

The radiator cools coolant whose temperature has
been raised.
Returning of cooled coolant to the engine maintains
cooling performance of the engine.

7.7.2 Structure of radiator

The radiator is made up of an upper tank, lower tank,
and core and the like.
(1) Core
(2) Overflow pipe

(3) Radiator cap

(4) Upper tank
D1803-CR-E4,D1803-CR-TE4,D1803-CR-TIE4,V2403-CR-E4,V2403-CR-TE4,V2403-CR-TE4BG,V2403-CR-TIE4
Valve full-open
temperature
95 ℃
203 ℉
(5) Lower tank
(6) Cooling air
(7) Tube
(8) Fin

7.7.3 Function of radiator

The radiator has the role of cooling coolant whose
temperature has been raised by heat from the engine.
When passing through the radiator core passage,
coolant is cooled by heat dissipation from the core to
air.

7.7.4 Specification of radiator

(Reference values)
Radiator capacity
Test pressure
*These values may be different depending on the product used
7.8 Radiator cap

7.8.1 Outline of radiator cap

The radiator cap maintains the pressure in the cooling
system at the specified pressure.

7.8.2 Structure of radiator cap

The radiator cap is made up of a pressure valve and
vacuum valve and the like.
(1) Overflow tube
(2) Pressure valve
(3) Vacuum valve
(A) When radiator internal pres-
sure is high
4. ENGINE
4.0 L
1.1 U.S.gals
0.88 Imp.gals
137 kPa
2
1.40 kgf/cm
19.9 psi
(B) When radiator internal pres-
sure is below atmospheric
pressure
4-63
KiSC issued 12, 2018 A