TM 5-6115-465-12
TO 35C2-3-446-1
NAVFAC P-8-625-12
TM 06858B/06859D-12
(2) Cleaning and Inspection.
(c) Remove thermostat.
(a) Clean heating elements with an approved
(2) Cleaning and Inspection.
solvent and dry thoroughly with filtered compressed air.
(a) Clean thermostat switch with an
(b) Visually inspect heating elements for
approved solvent and dry thoroughly with filtered com-
cracks, breaks, corrosion stripped or damaged threads, evi-
pressed air.
dence of shorting, or other damage.
(b) Visually inspect thermostat switch for
(3) Testing.
cracks, corrosion, evidence of shorting, stripped or dam-
aged threads and other damage.
( a ) Using an ohmmeter, check for open cir-
cuit between heater element terminal and casing. Ohmme-
(3) Testing.
ter shall indicate open circuit.
(a) Suspend thermostat switch in a container
( b ) Check resistance across terminals. Resis-
of clean water so that its temperature sensor is completely
tance shall be 30 3 ohms.
immersed but not touching the sides or bottom of the con-
tainer.
(c) Replace heater element which does not
test properly.
(b) Suspend a reliable thermometer in the
container so that its temperature sensing end is immersed
(4) Installation. Install heating element in
but not touching the sides or bottom of the container.
reverse order of removal procedures.
(c) Connect an ohmmeter across the termi-
h. Coolant Hoses and Fittings.
nals of the thermostat switch. Check that ohmmeter indi-
cates continuity.
(1) Removal. Remove damaged coolant hoses
and fittings by following the ascending numerical sequence
(d) Gradually heat container, stirring con-
of index numbers assigned to figure 4-5.
stantly to evenly distribute heat.
NOTE
(e) Observe both thermometer and ohmme-
ter. Ohmmeter should indicate continuity up to a tempera-
Only those hoses and fittings requiring replace-
ture of 150F 5F (65.6C 2.8C). Above this tempera-
ment need be removed.
ture, ohmmeter should indicate open circuit.
(2) Installation. Install coolant hoses and fit-
(f) Remove heat and allow the container to
tings in reverse order of removal procedures.
cool while observing thermometer and ohmmeter.
i.
Wiring Harnesses.
(g) Ohmmeter should indicate continuity at a
temperature of +35F (+1.7C) and below.
(1) Removal. Remove wiring harness assembly
terminals and connectors as required for access to other
(h) Replace thermostat switch if it fails to
components and testing or replacement of damaged parts.
operate properly.
NOTE
(4) Installation. Install thermostat switch in
reverse order of removal procedures.
Tag or otherwise identify electrical leads, termi-
g. Heating Elements.
nals, and connectors and wiring harness sup-
port clamps before removal to facilitate instal-
lation.
(1) Removal.
(2) Cleaning and Inspection.
(a) Drain engine cooling system (paragraph
(a) Clean wiring harness with filtered com-
pressed air and an electrician's brush or wipe with a clean,
(b) Tag and disconnect electrical leads to
lint-free cloth lightly moistened with an approved solvent.
heating elements (11, figure 4-5).
(b) Visually inspect wiring harness for
(c) Unscrew heating elements from pipe (12).
burned, bent, corroded or otherwise damaged terminals.
4-20
Change 17
