TM 5-6115-465-12
TO 35C2-3-446-1
NAVFAC P-8-625-12
TM 06858B/06858D-12
d. Installation.
(5) Gradually heat the oil, stirring so that heat will
(1) Install temperature transmitter into thermostat
be evenly distributed, and observe the thermometer and
housing spacer and tighten to 12-15 lbs-ft torque.
ohmmeter.
( 2 ) Refer to paragraph 3-31 and service the
(6) At 220F 3F. (104.8 + 1.5C.) the ohm-
radiator.
meter should indicate discontinuity.
OVER-TEMPERATURE
SWITCH
(7) Check continuity between pins B and C. Ohm-
meter should indicate continuity.
a. Removal.
(8) Replace the over-temperature switch if it fails
(1) Refer to paragraph 3-31 and drain the coolant
to operate within the above limits.
from the radiator.
d. Installation.
(2) Unscrew wiring connector from the overtem-
(1) Install over-temperature switch into cylinder
perature switch connector.
block and tighten to 12 to 15 lbs-ft torque.
NOTE
(2) Refer to paragraph 3-31 and service radiator.
The over-temperature switch is located on
the left rear side of the engine cylinder head
assembly.
a. Removal.
(3) Unscrew over-temperature switch from cylin-
der head assembly.
NOTE
b. Cleaning and Inspection.
Test oil pressure transmitter in accordance
(1) Clean over-temperature switch with filtered
with c below prior to removal.
compressed air and a soft bristle brush or with a clean,
(1) Remove nut, washer, and electrical lead from
lint-free cloth lightly moistened With an approved sol-
oil pressure transmitter.
vent.
(2) Unscrew oil pressure transmitter from coupling
(2) Inspect over-temperature switch for cracked
in engine block.
casing, corrosion, stripped or damaged threads, and
b. Cleaning and Inspection.
bent or broken connector pins.
(1) Clean oil pressure transmitter with dry, filtered
c. Testing.
compressed air and a soft bristle brush or wipe with a
(1) Suspend over-temperature switch in a container
clean, lint-free cloth lightly moistened with an ap-
of clean oil so that sensing element is completely
oroved solvent.
immersed but not touching the sides or bottom of the
(2) Inspect oil pressure transmitter for cracked cas-
container.
ing, stripped or damaged threads, corrosion, or other
(2) Suspend a reliable thermometer in the contain-
visible damage.
er. Do not allow the end of the thermometer to rest on
c. Testing.
the bottom of the container.
(1) Disconnect electrical lead to oil pressure
(3) Using an ohmmeter, check continuity between
transmitter.
(2) Connect an ohmmeter between transmitter ter-
B and C of the switch connector. A and D should indi-
minal and casing.
cate continuity and B and C should indicate discon-
(3) Refer to paragraph 2-10 and start the engine.
tinuity.
(4) Allow the engine to operate until normal
(4) Attach the ohmmeter leads to pins A and D.
operating temperatrue is indicated on the temperature
WARNING
gauge.
(5) Observe ohmmeter. Resistance shall be as
Do not exceed 250F (121.1C) as oil may ig-
specified in paragraph 1-6b(4).
nite.
