TM 5-3805-262-20
5-8. SENDING UNITS AND WARNING SWITCHES MAINTENANCE (CONT)
c. Water Temperature Sending U n i t ( c o n t ).
INSPECTION, TESTING, AND REPAIR
(1) Inspect wiring harness terminal (4) wire for cracked or broken insulation
or broken wire strands at connection to terminal. Repair cracked or bro-
ken insulation by applying insulation tape to area. If broken wire
strands are seen, cut wire as close to terminal as possible. Strip 1/4
inch insulation from end of wire taking care not to cut through wire then
crimp new terminal securely onto wire.
(2)
Inspect water temperature sending unit (5) for cracks, breaks, damaged
threads, distortion, broken or missing terminal, or other damage. Replace
if any of these conditions are seen.
( 3 ) I n s p e c t r e m a i n i n g p a r t s f o r c r a c k s , b r e a k s , d i s t o r t i o n , o r d a m a g ed
threads;
replace as necessary.
(4) Test water temperature sending unit (5) as follows:
( a)
(b)
(c)
(d)
( e)
Connect multimeter between water temperature sending unit body and
terminal as shown below.
Lower a thermometer and threaded end of water temperature sending unit
into a pan of water.
Slowly heat and stir water while watching thermometer and multimeter.
At 100 degrees F, multimeter should indicate 3000 to 3600 ohms. At 200
degrees F, multimeter should indicate 640 to 780 ohms.
Remove water temperature sending unit and thermometer from water and
disconnect multimeter.
Replace water temperature sending unit if multimeter indications in
step (c) above are not obtained.
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