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Service Manual Mitsubishi SQ-Series diesel engines
Version 08/2004
ENGLISH
THERMOSTAT COOLING SYSTEM
COOLING SYSTEM
15 THERMOSTAT
15.1 Inspection
Put each thermostat in a glass jar filled with water, and
test it for thermostatic action by heating the jar to raise
the water temperature. In the test, measure the
temperature at which the valve starts opening and that
at which the valve lift is more than 8 mm [0.3 in.]. If
these measurement are out of the assembly standard,
replace the thermostat.
Unit: mm [in.]
Figure 158 Testing thermostat
Valve lift, mm [in.]
Temperature, °C [°F]
0
8
[0.3]
76.5 ± 1.5
[170 ± 2.7]
90
[194]
Item Assembly Standard
Temperature at which valve
starts opening
76.5 ± 1.5°C
[170 ± 2.7°F]
Temperature at which valve lift
exceeds 8 mm [0.3 in.]
90°C [194°F]
CAUTION
a Stir up the water with a stick to keep the
temperature uniform.
b Install the thermostat with its air vent hole
up.
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