5-12
COOLING
AND
LUBRICATION
SYSTEM
THERMOSTAT
REMOVAL
• Drain a small amount of engine coolant. (
c::r
2-14)
• Place
a rag under the thermostat case.
• Remove the thermostat case.
• Remove the thermostat.
INSPECTION
Inspect the thermostat petiet f
or
signs of cracking.
Test the thermostat at the bench for control action, in the follow-
ing manner.
• Immerse the thermostat
CD
in the water contained
in
a beaker,
as shown
in
the illustration. Nole that the immersed thermo-
stat
is
in
suspension. Heat the water by placing the beaker on
a stove and observe the rising temperature on a thermometer
<21.
• Read the thermometer just when opening the thermostat. This
reading, which is the temperature
level at which the thermo-
stat valve begins to open, should satisfy the standard value.
_
Thermostat
valve
opening
temperature
Standard:
Approx
. 75°C
(t
67 OF)
• Keep on heating the water to raise its temperature.
• Just when the water temperature reaches specified value, the
thermostat
valve should have lifted by at least 6.0 mm (0.24 in) .
..
Thermostat
valve
lift
Standard:
Over
6.0
mm
at
90°C (Over 0.24 in
at
194°F)
• A thermostat failing to satisfy either of the two requirements
(start·to·open temperature and valve lift) must be replaced
with a new one.
INSTALLATION
• Install the thermostat in the reverse order of removal.
• Apply
engine coolant to the rubber seal on the thermostat.
• After installing the thermost
at
, be sure to add engine coolant.
(c::r2-14)
• Install the front fender.
String
Water
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