ARMY TM 9-6115-464-12
AIR FORCE TO 35C2-3-445-1
NAVY NAVFAC P-8-624-12
4-20 COOLANT TEMPERATURE TRANSMlTTER.
a.
Removal.
NOTE
Test coolant temperature transmitter in accordance with paragraph c. below prior to
removal. Coolant temperature transmitter is located on the engine thermostat housing.
(1) Refer to paragraph 3-27 and drain coolant from the radiator.
(2) Unscrew the wiring connector from the temperature transmitter.
(3) Unscrew the temperature transmitter from the thermostat housing.
b. Cleaning and Inspection.
(1) Clean temperature transmitter with filtered compressd air and a soft bristle brush or with a dean lint-free
cloth Iightly moistened with an approved solvent.
(2) Inspect temperature transmitter for cracked casing, corrosion and damaged threads and connector.
c.
Testing.
(1)
(2)
(3)
(4)
(5)
(6)
(7)
Disconnect wiring harness connector from coolant temperature transmitter.
Connect an ohmmeter or similar device between the connector and casing.
Refer to paragraph 2-6 and start the engine.
Allow the engine to operate while observing the ohmmeter.
Resistance should increase to a reading of 680 to 745 ohms when the engine reaches normal operating
temperature.
Refer to paragraph 2-7 and stop the engine.
Replace coolant temperature transmitter if resistance is not within specified limits.
d.
Installation.
(1) Install temperature transmitter into thermostat housing spacer and tighten to 12-15 lbs-ft torque.
(2) Refer to paragraph 3-27 and service the radiator.
4-21 OVER-TEMPERATURE SWITCH.
a.
Removal.
(1) Refer to paragraph 3-27 and drain the coolant from the radiator.
(2) Unscrew wiring connector from the overtemperature switch connector.
NOTE
The over-temperature switch is located on the left rear side of the engine cylinder head
assembly.
(3) Unscrew over-temperature switch from cylinder head assembly.
b. Cleaning and Inspection.
(1) Clean over-temperature switch with filtered compressed air and a soft bristle brush or with a clean, lint-
free cloth Iightly moistened with an approved solvent.
(2) Inspect over-temperature switch for cracked casing, corrosion, stripped or damaged threads, and
bent or broken connector pins.
4-38
