Checking The Thermostat - Yamaha F115A Service Manual

POWR
a
CYLINDER HEAD ASSEMBLY
5280

CHECKING THE THERMOSTAT

1. Check:
• Thermostat
Damage/valve does not open →
Replace.
2. Measure:
• Valve operating temperature
• Valve lift a
Out of specification → Replace the
thermostat.
Water temperature
50˚C (122˚F)
60˚C (140˚F)
Measuring steps
(1) Suspend the thermostat in a container
filled with water.
(2) Slowly heat the water.
(3) Place a thermometer in the water.
(4) While stirring the water, observe the
thermometer's indicated temperature.
5-25
Valve lift
Below
0 mm (0 in)
Above Min. 4.3 mm
(0.17 in)
E
5