wsm M7040 - Page 150

ENGINE
M6040, M7040, WSM
1-S18
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.
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Radiator Cap Air Leakage
1. Set a radiator tester on the radiator cap.
2. Attach a radiator tester.
Apply the specified pressure of 88 kPa (0.9 kgf/cm
2
, 13 psi).
3. Check if the pressure drop to less than 59 kPa (0.6 kgf/cm
2
,
9 psi) in 10 seconds.
4. If the pressure is less than the factory specification, replace it.
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Radiator Water Leakage
1. Pour a specified amount of water into the radiator.
2. Attach a radiator tester.
Increase water pressure to the specified pressure of 137 kPa
(1.4 kgf/cm
2
, 20 psi).
3. Check the radiator for water leaks.
4. When water leakage is excessive, replace the radiator. If water
leakage is caused by a small pinhole, correct the radiator with
radiator sealant.
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Thermostat Valve Opening Temperature
1. Push down the thermostat valve and insert a string between the
valve and the valve seat.
2. Place the thermostat and a thermostat in a container with water
and gradually heat the water.
3. Hold the string to suspend the thermostat in the water. When
the water temperature rises, the thermostat valve will open,
allowing it to fall down from the string.
Read the temperature at this moment on the thermometer.
4. Continue heating the water and read the temperature when the
valve has risen by about 8 mm (0.315 in.).
5. If the measurement is not acceptable, replace the thermostat.
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Thermostat's valve
opening temperature
Factory specification
74.5 to 78.5 °C
166.1 to 173.3 °F
Temperature at which
thermostat completely
opens
Factory specification
90 °C
194 °F
KiSC issued 07, 2012 A