Yamaha 40V - Thermostat Inspection

5-24
POWR
E
CYLINDER HEAD, THERMOSTAT AND EXHAUST
COVER
Thermostat inspection
1. Inspect:
● Thermostat
Stick/Damage → Replace.
2. Measure:
● Valve opening temperature
● Valve lift
Out of specification → Replace.
Water temperature Valve lift
Below 48 ~ 52 ˚C
(118 ~ 126 ˚F)
0 mm
(0 in)
Above 60 ˚C
(140 ˚F)
Min.3 mm
(0.12 in)
Measuring steps:
● Suspend thermostat in a vessel.
● Place reliable thermometer in a water.
● Heat water slowly.
● Observe thermometer, while stirring
water continually.