ARMY TM 9-6115-464-12
AIR FORCE TO 35C2-3-445-1
NAVY NAVFAC P-8-624-12
f.
(2) Cleaning and Inspection.
(a) Clean coolant pump and motor assembly with an approved solvent and dry with filtered com-
pressed air.
(b) Visually inspect motor for cracks, corrosion, evidence of shorting and other damage.
(c) Visually inspect pump for cracks, corrosion, and other damage.
(3) Testing.
(a)
(b)
(c)
(d)
(e)
(f)
(g)
(h)
(i)
Check that three-way valve (47, Figure 5-5) is in the CLOSED position.
Disconnect coolant hose assembly (67) from elbow (57) in three-way valve and position to drain
into a three gallon container.
Remove generator set radiator cap.
Place ON-OFF switch (Figure 5-7) in the ON position.
Note time required to fill container. Time shall be approximately three minutes.
Place ON-OFF switch in the OFF position and reconnect coolant hose assembly.
Replace pump and motor assembly if it fails to function properly.
Service generator set cooling system (paragraph 3-27).
Install coolant hoses and service cooling system (paragraph 3-27) if pump functions properly.
Thermostat Switch.
(1) Removal
(a) Refer to paragraph 3-27 and drain the radiator.
(b) Tag and disconnect electrical leads to thermostat switch (17, Figure 5-5).
(c) Remove thermostat.
(2) Cleaning and Inspection.
(a) Clean thermostat switch with an approved solvent and dry thoroughly with filtered compressed air.
(b) Visually inspect thermostat switch for cracks, corrosion, evidence of shorting, stripped or damaged
threads and other damage.
(3) Testing.
(a)
(b)
(c)
(d)
(e)
(f)
(g)
(h)
Suspend thermostat switch in a container of clean water so that its temperature sensor is completely
immersed but not touching the sides or bottom of the container.
Suspend a reliable thermometer in the container so that its temperature sensing end is immersed
but not touching the sides or bottom of the container.
Connect an ohmmeter across the terminals of the thermostat switch. Check that ohmmeter indicates
continuity.
Gradually heat container, stirring constantly to evenly distribute heat.
Observe both thermometer and ohmmeter. Ohmmeter should indicate continuity up to a tem-
perature of 150°F± 5°F (65.6°C ± 2.8°C). Above this temperature, ohmmeter should indicate
open circuit.
Remove heat and allow the container to cool while observing thermometer and ohmmeter.
Ohmmeter should indicate continuity at a temperature of +35°F ( +1.7°C) and below.
Replace thermostat switch if it fails to operate properly.
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