Yamaha N MAX GPD150-A 2015, Service Manual

Page: 301 / 450

T H E R M O S T A T
6-6
EAS31248
CHECKING THE THERMOSTAT ASSEMBLY
1. Check:
• Thermostat “1”
Does not open at 74–78°C (165–172°F)
→
Replace.
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a. Suspend the thermostat “1” in a container “2”
filled with water.
b. Slowly heat the water.
c. Place a thermometer “3” in the water.
d. While stirring the water “4”, observe the ther-
mostat and thermometer’s indicated temper-
ature.
e. Check the thermostat element position “5”.
Same level for the thermostat element upper
end and the hole lower line “a” at 90 °C(194
°F)
TIP
If the accuracy of the thermostat is in doubt, re-
place it. A faulty thermostat could cause serious
overheating or overcooling.
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EAS30445
INSTALLING THE THERMOSTAT
ASSEMBLY
1. Fill:
• Cooling system
(with the specified amount of the recom-
mended coolant)
Refer to “CHANGING THE COOLANT” on
page 3-19.
2. Check:
• Cooling system
Leaks
→
Repair or replace any faulty part.
Refer to “INSTALLING THE RADIATOR” on
page 6-3.
3. Measure:
• Radiator cap opening pressure
Below the specified pressure
→
Replace the
radiator cap.
Refer to “CHECKING THE RADIATOR” on
page 6-3.
1
1
2
3
4
5
a
A. Fully closed
B. Fully open
B
A
74 – 78˚C
(165 – 172˚F)
90˚C
(194˚F)
7 mm
(0.28 in)
0.5 mm
(0.02 in)