Yamaha E40J - Checking the Cooling Water Passages; Checking the Thermostat

6F65G11
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Checking the thermostat
1. Remove the thermostat cover 1, gasket
2, and thermostat 3.
2. Suspend the thermostat in a container of
water.
3. Place a thermometer in the water and
slowly heat the water.
4. Check the thermostat valve opening at
the specified water temperatures.
Replace if out of specification.
5. Install the thermostat and thermostat
cover, and then tighten the cover bolts.
Checking the cooling water pas-
sages
1. Check the cooling water inlet cover 1,
screw 2 and cooling water inlet for clog-
ging. Clean if necessary.
å E40G
∫ E40J
2. Place the lower unit in water, then start
the engine.
3. Check for water flow at the cooling water
pilot hole. If there is no water flow, check
the cooling water passage inside the out-
board motor.
6B430060
6F630040
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6B430070
Fuel system/Power unit
Water
Valve lift a
temperature
58–62°C
0 mm (0 in)
(136–147°F) ( valve begins to tilt )
above more than
70°C (158°F)
3.0 mm (0.12 in)
6F630060
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6F630070
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å
∫
6F610170