T O 35C2-3-442-2
P-8-627-34
TM-07464A-35
TM 5-6115-457-34
4. Connect 0 to 20 PSI pressure
b . Pressure Test.
gauges to radiator hose tubes. Connect
1. Plug radiator filler neck, hose
manual shut off valve and then an 80 GPM
water supply to upper radiator hose tube.
tubes, and shutter power element port.
Connect return line from gauge at lower
Connect a regulated pressure air supply
radiator hose tube to water supply reser-
manual shutoff valve, and 0-20 PSI pressure
voir. Close manual shut off valve.
gauge, to radiator vent tube.
CAUTION
2. Place radiator in suitable tank
filled with water.
Stop test immediately if pressure
gauge at top hose port reaches
3. Slowly apply 15 PSI to radiator
15 PSI.
and check for air bubbles that would indi-
cate leaks. Mark leaks if any.
5. Start water supply. Slowly open
manual shutoff valve while observing gauge
4. Remove radiator from tank.
at top hose tube. Stop test if pressure
Relieve all air pressure and remove test
reaches 15 PSI. Fully open shutoff valve
equipment. Repair leaks.
and record pressure on both gauges. If
4-11. DISASSEMBLY. Refer to figure 4-1
pressure differential between upper and
and disassemble radiator as follows:
lower gauges exceeds 1.8 PSI, the radiator
i s restricted.
NOTE
6. Shut down water supply, relieve
Prior to disassembly of radiator,
pressure, and remove test equipment from
its condition should be analyzed by
r a d i a t o r . If pressure differential exceeded
1.8 PSI, remove radiator cap and perform
performing test specified in para-
graph 4-10.
the following procedures.
a. Mark mounting brackets, top tank,
CAUTION
and bottom tank in relation to core assem-
bly to insure proper reassembly.
Do not immerse cold radiator in
b. Remove oxide film on all soldered
boiling solution.
joints.
c. Using suitable soldering tools,
7. Mix a solution of one pound baking
unsolder vent tube, mounting brackets, top
soda to each gallon. of water. Fill a
tank, and bottom tank.
suitable boiling tank with solution and place
WARNING
radiator in tank. Bring solution to a boil
and boil radiator for a minimum of 30 min-
Avoid breathing fumes generated by
utes. Remove radiator and perform steps 2.
unsoldering/soldering. Eye pro-
through 6.
tection is required.
4-12. CLEANING.
8. If pressure differential still
a. Remove excessive solder using a
exceeds 1.8 PSI, the radiator must be dis-
suitable torch and rag.
assembled and cleaned.
Change 8
4-2
