1-S18
MX5100, WSM
ENGINE
Radiator Cap Air Leakage
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.
1. Set a radiator tester and an adaptor on the radiator cap.
2. Apply the specified pressure 90 kPa (0.9 kgf/cm
2
, 10 psi), and
measure the time for the pressure to fall to 60 kPa (0.6 kgf/cm
2
,
9 psi).
3. If the measurement is less than the factory specification, replace
the radiator cap.
W10387530
Radiator Water Leakage
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.
1. Pour a specified amount of water into the radiator.
2. Set a radiator tester and an adaptor 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.
• 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.
W10389070
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. 6 mm (0.2 in.).
4. If the measurement is not within the factory specifications,
replace the thermostat.
W1035849
Pressure falling time Factory spec.
More than 10 seconds
for pressure fall from
90 to 60 kPa
(from 0.9 to 0.6 kgf/cm
2
,
from 10 to 9 psi)
Radiator water leakage
test pressure
Factory spec.
No leak at specified
pressure
Thermostat’s valve
opening temperature
Factory spec.
69.5 to 72.5 °C
157.1 to 162.5 °F
Temperature at which
thermostat completely
opens
85 °C
185 °F
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