ARMY TM 9-6115-644-24
AIR FORCE TO 35C2-3-446-12
MARINE CORPS TM 09249A/09246A-24/2
2-108-4 Installation.
a.
Install coolant temperature sender (4, FIGURE 2-30) in engine head.
b. Connect electrical lead and close left side engine access doors.
c.
Connect negative battery cable and close battery access door.
2-109 COOLANT HIGH TEMPERATURE SWITCH.
2-109-1
a.
b.
c.
d.
e.
f.
g..
h.
i.
2-109-2
a.
b.
c.
d.
e.
f.
2-109-3
Testing.
Shut down generator set.
Remove coolant high temperature switch, paragraph 2-109-2.
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 condi-
tions.
Gradually heat antifreeze/water mixture, stirring so that heat will be evenly distributed and observe thermometer
and multimeter.
At between 220 and 230°F (101 and 107°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 2-109-4.
Removal.
Shut down generator set.
Open battery access door and disconnect negative battery cable.
WARNING
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.
WARNING
Always remove radiator cap slowly to permit pressure to escape. Failure to follow this
warning could result in severe personal injury.
Slowly remove radiator cap (1, FIGURE 2-23).
Open left side engine access doors open engine block drain valve (3, FIGURE 2-30), and drain coolant into
suitable container.
Tag and disconnect coolant high temperature switch (5) electrical leads.
Unscrew high temperature switch (5) from lower thermostat housing.
Cleaning and Inspection.
2-156
