TOHATSU BFT115A Service Manual page 365

THERMOSTAT INSPECTION
Remove the thermostat (page 11-5).
Immerse the thermostat (1) in water.
Heat the water and observe the operation of the
thermostat as the water temperature increases.
Measure the water temperature when the thermostat
starts opening.
Don't let the thermometer (2) or the thermostat touch
the container; this may cause a false reading.
CYLINDER HEAD SIDE:
START OPENING: 48 °C - 52 °C (118 °F - 126 °F)
FULLY OPEN:
CYLINDER BLOCK SIDE:
START OPENING: 58 °C - 62 °C (136 °F - 144 °F)
FULLY OPEN:
Measure the lift height when the thermostat is fully
open.
CYLINDER HEAD SIDE:
LIFT HEIGHT:
CYLINDER BLOCK SIDE:
LIFT HEIGHT:
60 °C (140 °F)
70 °C (158 °F)
More than 3.0 mm (0.12 in)
More than 3.0 mm (0.12 in)
COOLING SYSTEM
(2)
(1)
11-15