Checking The Thermostat; Installing The Thermostat - Yamaha Grizzly550 User Manual

EAS26450

CHECKING THE THERMOSTAT

1. Check:
• Thermostat
Does not open at 50–54 °C (122–129.2 °F) →
Replace.
M MMM M MMM M M MMM M M MMM M
a. Suspend the thermostat "1" in a container "2"
filled with water.
b. Slowly heat the water "3".
c. Place a thermometer "4" in the water.
d. While stirring the water, observe the thermo-
stat and the temperature indicated on the
thermometer.
A. Fully closed
B. Fully open
TIP
If the accuracy of the thermostat is in doubt, re-
place it. A faulty thermostat could cause serious
overheating or overcooling.
L LLL L LLL L L LLL L L LLL L
M MMM M M MMM M MMM
L LLL L L LLL L LLL
6-5
2. Check:
• Thermostat housing cover
• Thermostat housing (cylinder head)
Cracks/damage → Replace.
EAS26480

INSTALLING THE THERMOSTAT

1. Install:
• Copper washer New
• Coolant temperature sensor
Coolant temperature sensor
18 Nm (1.8 m·kg, 13 ft·lb)
ECA28P1016
NOTICE
Use extreme care when handling the coolant
temperature sensor. Replace any part that
was dropped or subjected to a strong im-
pact.
2. Install:
• Thermostat "1"
• O-ring "2" New
• Thermostat cover "3"
Thermostat cover bolt
10 Nm (1.0 m·kg, 7.2 ft·lb)
TIP
Install the thermostat with its breather hole "a"
facing up.
3
2
LS
3. Fill:
• Cooling system
(with the specified amount of the recom-
mended coolant)
Refer to "CHANGING THE COOLANT" on
page 3-17.
4. Check:
• Cooling system
Leaks → Repair or replace any faulty part.
THERMOSTAT
New
a
1