Kubota SM-E4B Series Workshop Manual page 82

SM-E4B SERIES, WSM
CAUTION
• When removing the radiator cap, wait at least ten minutes after the engine has stopped and cooled down.
Otherwise, hot water may gush out, scalding nearby people.
Radiator Cap Air Leakage
1. Set a radiator tester (1) and an adaptor (2) on the radiator cap.
2. Apply the specified pressure of 88 kPa (0.90 kgf/cm
and measure the time for the pressure to fall to 59 kPa
2
(0.60 kgf/cm , 8.5 psi).
3. If the measurement is less than the factory specification,
replace the radiator cap.
Pressure falling time Factory specification
(1) Radiator Tester
Radiator Water Leakage
1. Pour a specified amount of water into the radiator.
2. Set a radiator tester (1) and an adaptor (2) and raise the water
pressure to the specified pressure.
3. Check the radiator for water leaks.
4. For water leak from the pinhole, replace the radiator or repair
with the radiator cement. When water leak is excessive, replace
the radiator.
Radiator water leakage
Factory specification
test pressure
NOTE
• The pressure of the leak test is different from each radiator
specification.
Thus, do the leak test, refer to the test pressure of each
radiator specification.
(1) Radiator Tester
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. 8.0 mm (0.31 in.).
4. If the measurement is not within the factory specifications,
replace the thermostat.
Thermostat's valve
Factory specification
opening temperature
Temperature at which
thermostat completely Factory specification
opens
1-S18
ENGINE
9Y1210785ENS0008US0
2
, 13 psi),
More than 10 seconds for
pressure fall
88 → 59 kPa
(0.90 → 0.60 kgf/cm
13 → 8.5 psi)
(2) Adaptor
9Y1210785ENS0009US0
No leak at specified
pressure
(2) Adaptor
9Y1210785ENS0010US0
69.5 to 72.5 °C
157.1 to 162.5 °F
85 °C
185 °F
9Y1210785ENS0011US0
KiSC issued 01, 2013 A
2
,