10-11
Chapter 10 COOLING SYSTEM
2.3 Thermostat for Jacket Water and Air Cooler - Inspect
2.3.1 Thermostat Seal - Inspect
(1) Inspect the thermostat seal for deterioration and cracks.
If defects are found, replace the seal with a new one.
(2) Refer to the illustration for correct orientation of seal
installation.
Thermostat Seal - Install
2.3.2 For Water Jacket and Air Cooler Thermostat
Operation - Inspect
(1) Immerse the thermostat in a container filled with water.
(2) Heat the water while measuring water temperature.
Record the temperature at which valve start to open,
and at which valve lift becomes to the standard value.
Replace the thermostat if a deviation from the standard
temperature is unusual.
Note:(a) Stir the water to maintain uniform temperature dur-
ing the test.
(b) At assembling, be sure to check the valve opening
temperature marked on the side of thermostat valve.
Thermostat Operation - Inspect
Mounting direction
Thermostat seal
Thermostat
Be very careful with hot water and flames.
Or, you may get burned or cause a fire.
Water (stir with a stick)
Part No. Item Standard value Remarks
For jacket water 37546-21700
Valve opening temperature
69 to 73 ºC
[157 to 163 ºF]
Opening temperature stamp 71 ºC [160 ºF]
Temperature at which valve lift
becomes 9 mm [0.35 in.] or more
85 ºC
[185 ºF]
For air cooler
35C46-05200
Valve opening temperature
33 to 37ºC
[91.4 to 98.6 ºF]
Opening temperature stamp 35 ºC [95 ºF]
Temperature at which valve lift
becomes 10 mm [0.35 in.] or more
50ºC
[122 ºF]
37546-40700
Valve opening temperature
69 to 73 ºC
[157 to 163 ºF]
Opening temperature stamp 71 ºC [160 ºF]
Temperature at which valve lift
becomes 11 mm [0.43 in.] or more
85 ºC
[185 ºF]
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