Sensor Inspection - Komatsu 4D98 Series Shop Manual

3; Inspection and Adjusfemenf
3.9 Sensor Inspection
(1)
Thermostat and Thermal Switch Inspection
0
Thermostat
Place the thermostat in a container
filled with water. Heat it while measur-
ing the water temperature, and see that
the thermostat is actuated at tempera-
ture of following table.
4TNE94.98 4TNE106(T)
Valve
opening
temperature (X)
71 - 85
82 - 95
n -
Themometer
0
(2)
Thermoswitch
Place the thermoswitch in a container
filled with antifreeze or oil. Heat it while
measuring the fluid temperature. The
switch is normal if the voltammeter
shows continuity when the fluid tem-
perature is 107°C - 113%.
Oil pressure switch
Disconnect the connector from the oil
pressure switch. Keep the voltammeter
probes in contact with the switch terminal
and cylinder block while operating the
engine. It is abnormal if circuit is closed.
ter probes
J
3-10