ARMY TM 9-6115-643-24
AIR FORCE TO 35C2-3-445-22
d. Inspect temperature sender for cracked casing, corrosion, and damaged threads and connector.
e. If no repair is needed, install coolant temperature sender, paragraph 2.106.4.
2.106.4. Installation.
a. Install coolant temperature sender (3, FIGURE 2-31) in engine head.
b. Connect electrical lead and close right and left side engine access doors.
c. Add coolant to overflow bottle (5, FIGURE 2-26), as necessary, to replace drained coolant.
d. Connect negative battery cable and close battery access door.
2.107. COOLANT HIGH TEMPERATURE SWITCH.
2.107
a.
b.
c .
d .
e.
f .
g.
h.
i.
2.107
a.
b.
W A R N I N G
c .
.1. Testing.
Shut down generator set.
Remove coolant high temperature switch, paragraph 2.107.2.
Suspend high temperature switch in a container of 50/50 mixture of antifreeze and water so that sensing element
is completely immersed but not touching sides or bottom of container.
Suspend a reliable thermometer in container. Do not allow end of thermometer to rest on bottom of container.
Set multimeter for ohms and check for continuity between switch terminals. Switch operates under open conditions.
Gradually heat antifreeze/water mixture, stirring so that heat will be evenly distributed and observe thermometer
and multimeter.
At between 216.5 and 223.5°F (102.5 and 106°C) multimeter should indicate continuity.
Replace high temperature switch if it fails to operate as above.
If replacement is not needed, install coolant high temperature switch, paragraph 2.107.4.
.2. Removal.
Shut down generator set.
Open battery access door and disconnect negative battery cable.
Coolant can get very hot. Allow system to cool down before performing
maintenance. Failure to follow this warning could result in severe burns
and injuries.
W A R N I NG
Always remove radiator cap slowly to permit pressure to escape. Fail-
ure to follow this warning could result in severe personal injury.
Slowly remove radiator cap (1, FIGURE 2-23).
2-151
