Inspection Of Thermostat - TOHATSU MD 70-90C2 Service Manual

Maintenance

3) Inspection of Thermostat

1. Remove air rail.
Loosen cover installation bolts 1, remove them, and then
2.
remove cover 2 and thermostat 3.
Hang thermostat 3 in the water contained in vessel.
3.
4. Put thermometer in the water, and warm up water to
measure valve opening temperature.
Put a piece of thread in the closed valve gap and
hang it in the water. Valve opening moment can
be known when thermostat is released to drop
due to opening with rise of temperature.
Valve Opening Temperature:
60°C (140°F)
Measure valve lift a of thermostat when prescribed
5.
temperature has been reached. Replace if the length is
less than specified value.
Water Temperature
75˚C (167˚F)
6. Install thermostat, new gasket and cover.
Thermostat Cover Bolt:
6 N · m (4 lb · ft) [0.6 kgf · m]
3-12
Valve Lift a
4.5 mm (0.177 in) or more
3 3
1
2
3
a
TLDI 75/90C2 2010