Kubota RTV1140CPX, Workshop Manual

Page: 97 / 379

ENGINE
RTV1140CPX, WSM
1-S14
CAUTION
• When removing the radiator cap, wait at least ten minutes after the engine has stopped and cooled down.
Otherwise, there is risk of scalding to yourself and people rearby from steam and hot water.
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Radiator Cap Air Leakage
1. Install radiator cap (1) on adaptor (3) and radiator tester (2).
2. Apply the specified pressure (88 kPa, 0.9 kgf/cm
2
, 13 psi), and
measure the time for the pressure to fall to 59 kPa (0.6 kgf/cm
2
,
9 psi).
3. If the measurement is less than the factory specification,
replace the radiator cap
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Radiator Water Leakage
1. Pour a specified amount of water into the radiator.
2. Install a radiator tester (1) and an adapter (2), and raise the
water pressure to the specified pressure.
3. Check the radiator for water leaks.
4. For water leak from a pinhole, repair with the radiator cement.
When water leak is excessive, replace the radiator.
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Thermostat Valve Opening Temperature
1. Suspend the thermostat in the water by a string with its end
inserted between the valve and seat.
2. Heating the water gradually, read the temperature when the
valve opens and leaves the string.
3. Continue heating and read the temperature when the valve
opens approx. 8 mm (0.315 in.).
4. If the measurement is not within the factory specifications,
replace the thermostat.
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Pressure falling time Factory specification
More than 10 seconds for
pressure fall from
88 to 59 kPa
(from 0.9 to 0.6 kgf/cm
2
,
from 13 to 9 psi)
(1) Radiator Cap
(2) Radiator Tester (3) Adaptor
Radiator water leakage
test pressure
Factory specification
177 kPa
1.80 kgf/cm
2
25.7 psi
(1) Radiator Tester (2) Adaptor
Thermostat's valve
opening temperature
Factory specification
80.5 to 83.5 °C
176.9 to 182.3 °F
Thermostat's at which
thermostat completely
opens
Factory specification
95 °C
203 °F
KiSC issued 05, 2014 A