Checking The Thermostat; Installing The Thermostat - Yamaha YFM660FP Service Manual

Temperature
THERMOSTAT

CHECKING THE THERMOSTAT

1.Check:
Thermostat 1
●
Does not open at 50 ~ 54 °C (122 ~ 158 °F)
→ Replace.
*****************************************************
Checking steps:
●
Suspend the thermostat in a container filled
with water.
●
Slowly heat the water.
●
Place a thermometer in the water.
●
While stirring the water, observe the thermo-
stat and thermometer's indicated tempera-
ture.
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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 housing cover
●
Thermostat housing
●
Cracks/damage → Replace.

INSTALLING THE THERMOSTAT

1.Install:
Thermostat 1
●
Thermostat housing cover
●
NOTE:
Install the thermostat with its breather hole a
facing up.
2.Fill:
Cooling system
●
(with the specified amount of the recom-
mended coolant)
Refer to "CHANGING THE COOLANT" in
CHAPTER 3.
3.Check:
Cooling system
●
Leak → Repair or replace any faulty part.
5 - 6
COOL