Checking The Thermostat - Yamaha YP400T, YP400V, YP400W Service Manual

THERMOSTAT
EAS00462

CHECKING THE THERMOSTAT

1. Check:
• thermostat 1
Does not open at 70.5 ~ 73.5 °C (158.9 ~
164.3 °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 thermometer's indicated tem-
perature.
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1 Thermostat
2 Container
3 Thermometer
4 Water
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
Cracks/damage → Replace.
3. Check:
• thermostat inlet hose
• thermostat outlet hose
Cracks/damage → Replace.
6 - 5
COOL
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