3-20
Maintenance
4st 2/2.5/3.5 2007
5. Install thermostat 2, new gasket 3 and then cap 1.
22) Inspection of Thermostat
1.
Remove bolts, and then thermostat cap 1 and thermostat 2.
4. Measure valve lift a of thermostat 2 when prescribed
temperature has been reached. Replace if the length is less
than specified value.
Water Temperature Valve Lifta
65˚C±2˚C(150˚F±4˚F) 3.0 mm (0.12 in) or more
2. Hang thermostat 2 in the water contained in vessel.
3. Put thermometer in the water, and warm up water to measure
valve opening temperature.
a
Thermostat Cap Bolt :
6 N･m (4 lb･ft) [0.6 kgf･m]
Put a piece of thread in the closed valve gap and
hang it in the water. Valve opening moment can be
known when thermostat 2 is released to drop due
to opening with rise of temperature.
Since thermostat starts to open a few minutes after
the opening temperature is reached, measure the
lift a after maintaining it for approximately 5
minutes at around 65˚C(150˚F).
Valve Opening Temperature :
52˚C±2˚C(125˚F±4˚F)
(Valve starts to open at this temperature.)
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