TOHATSU MFS 8B Service Manual page 79

1. Check propeller blades and spline for cracks, damages,
wear and corrosion. Replace if necessary.
1. Loose thermostat cover nut and remove thermostat
2. Hang thermostat in the water contained in vessel.
3. Put thermometer in the water, warm up water and
measure water temperature when valve opens.
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±1.5°C (140 ± 3°F)
(Valve starts to open at this temperature.)
4. Measure valve lift of thermostat when prescribed
temperature has been reached. Replace if the length is
less than specified value.
Water Temperature
75±1.5°C
(167 ± 3.0°F)
5. Install thermostat, new gasket and cover.
Install thermostat with recess
valve directing upward.
Thermostat Cover Bolt :
6 N · m (4 lb · ft) [0.6 kgf · m]
4st 8/9.8 2016
.
Valve lift
3.0mm (0.12in) or over
of air bleeding
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