Inspection Of Propeller; Inspection Of Thermostat - TOHATSU MFS 4 Service Manual

18) Inspection of Propeller

1. Check propeller blades and spline for cracks, damages,
wear and corrosion. Replace if necessary.

19) Inspection of Thermostat

Loose thermostat cover nut and remove thermostat 1.
1.
Hang thermostat 2 in the water container.
2.
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 :
50 - 54°C (121 - 129°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 :
63 - 67°C (146 - 154°F)
Valve lift a :
3.0mm (0.12in) or over
5. Install thermostat, new gasket and cover.
Thermostat Cover Bolt :
6 N · m (4 lb · ft) [0.6 kgf · m]
4st 4/5/6 2011
1 1
2
a
3
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