Yamaha XT660R(S) Automobile User Manual


 
6 - 6
COOL
THERMOSTAT
EAS00462
CHECKING THE THERMOSTAT
1. Check:
thermostat
1
Does not open at 71 ~ 85 °C (159.8 ~
185 °F)
Replace.
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a. Suspend the thermostat in a container filled
with water.
b. Slowly heat the water.
c. Place a thermometer in the water.
d. While stirring the water, observe the ther-
mostat and thermometers indicated tem-
perature.
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1
Thermostat
2
Thermometer
3
Water
4
Container
È
Fully closed
É
Fully open
NOTE:
_
If the accuracy of the thermostat is in doubt,
replace it. A faulty thermostat could cause seri-
ous overheating or overcooling.
2. Check:
thermostat cover
thermostat housing (cylinder head)
Cracks/damage
Replace.
Opening (mm)
Temperature
EAS00466
INSTALLING THE THERMOSTAT
1. Install:
thermostat
1
O-ring
2
thermostat cover
3
NOTE:
_
Install the thermostat with its breather hole
a
facing up.
Lubricate the O-ring with a thin coat of lith-
ium-soap-based grease.
1
2
3
a
New
New
T
R
.
.
10 Nm (1.0 m · kg, 7.2 ft · lb)