Yamaha RS90K Manuel D'atelier page 578

a
b
THERMOSTAT
INSPECTION
1. Inspect:
• Thermostat
Does not open at 69 ~ 73 °C (156 ~ 163 °F)
→ Replace.
Inspection 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 thermostat
and thermometer's indicated temperature.
1 Thermometer
2 Water
3 Thermostat
4 Container
È Fully closed
É Fully open
Ê More than 7 mm (0.28 in)
NOTE:
If the accuracy of the thermostat is in doubt,
replace it. A faulty thermostat could cause serious
overheating or overcooling.
2. Inspect:
• Thermostat housing cover
• Thermostat housing
Cracks/damage → Replace.
INSTALLATION
1. Install:
• Thermostat
(into the thermostat housing)
NOTE:
Install the thermostat with its breather hole a
aligned with the this place b on the thermostat
housing.
2. Install:
• Thermostat housing cover
• Thermostat housing cover bolts
Thermostat housing cover bolt:
10 Nm (1.0 m · kg, 7.2 ft · lb)
6-7
COOL