Checking The Cooling Water Passage - Yamaha 55DEHD Service Manual

3. Place a thermometer in the water and
slowly heat the water.
4. Check the thermostat valve opening at
the specified water
Replace if out of specification.
Water
temperature
48–52°C
(118.4–125.6°F)
above
60°C (140°F)
5. Install the new gasket 6 thermostat 5,
PCV 4, spring 3 and thermostat cover
2, and then tighten the thermostat cover
bolts 1.
5
6
6885J11
6B430060
temperatures.
6B430070
Valve lift a
0.05 mm (0.002 in)
(valve begins to lift)
more than
3.0 mm (0.12 in)
4
3
1
2
1
68830070
Fuel system / Power unit

Checking the cooling water passage

1. Check the cooling water inlet covers 1
and cooling water inlet. Clean the water
inlet cover and cooling water inlet if
clogged.
1
2. Place the lower unit in water, and then
start the engine.
3. Check for a water flow from the cooling
water pilot hole. Turn the engine off. If
there is no water flow, check the water
pump and cooling water passage.
1
2
1
3
68830080
4
5
6
68810130
7
8
9
3-4