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7-8
COOLING SYSTEM
(2)
Remove the radiator bottom tank.
(3) Melt the soft solder holding the cooler to
the tank.
(4)
Remove the stamped retainer nuts holding the
cooler fittings to the bottom tank and remove the
cooler.
(5) Install a new cooler or repair the old cooler with
silver solder
and reinstall as follows:
(6)
Position the oil cooler in the bottom tank and
install the stamped retainer nuts on the oil cooler
(7) Use soft solder to secure the cooler in the tank.
(8)
Attach the bottom tank to the radiator using soft
(9)
Install the radiator as described in Paragraph
(10) Fill the cooling system and test for leaks.
If
the transmission operates properly after repair-
ing the leak, drain the transmission and torque con-
verter while hot, remove the transmission oil pan and
inspect for sludge, rust, dirty or plugged inlet filter.
If none of these conditions are found, reconditioning
may not be necessary. Reassemble, using Transmis-
sion Fluid Type "A," Suffix "A."
solder.
"RADIATOR."
PRESSURE FLUSHING THE COOLING
SYSTEM
(1)
Clean the system using the recommended Cool-
ing System Cleaner according to the directions on the
label.
(2)
Drain the radiator and engine block and re-
move both radiator hoses.
(3) Remove the thermostat and reinstall the hous-
ing.
(4)
Connect a flushing gun, Tool C-3514, to the en-
gine thermostat housing, using a length of rubber
hose.
(5)
Install a drain hose on the water pump inlet.
(6)
Connect a flushing gun to sources of water and
air pressure.
(7)
Fill
the cylinder block with water by restrict-
ing the drain hose. Leave the water valve open.
(8) Open and close the air valve to agitate and
force away any foreign material. Continue the opera-
tion until the water runs clear.
(9)
For the final block flushing,
fill
the block with
water and remove the drain plugs. Use air pressure
until the water from the block drains runs clear.
(10) To reverse flush the radiator, disconnect the
two hoses from the engine and attach them to the
radiator. Attach the flushing gun hose to the lower
radiator tank and the drain hose to the top tank.
(11) Fill
the radiator with water, leave the water
valve open, and open and close the air valve. Con-
tinue the operation of the air valve until the water
runs clear.
(12) For the final radiator flushing, attach a flush-
ing gun to the top hose and repeat the flushing oper-
ation.
(13) Test the thermostat as described in Paragraph
"THERMOSTAT." If satisfactory, install with the pel-
let towards the engine, using a new gasket.
(14) Install the hoses and fill the cooling system
to 1% inches below the filler neck, using water and
rust resistor or water and antifreeze, depending on the
season.
(15) Operate the engine until the temperature
gauge indicates normal operating temperature and
continue an additional five minutes to release any
air trapped in the system. Inspect the coolant level
and if necessary, add additional water.
THERMOSTAT
The thermostat is actuated
by
a pellet containing
a copper-impregnated wax (Fig. 10). As the temper-
ature of the pellet increases, the wax expands and
opens the valve. A 180' thermostat is standard equip-
ment.
Fig. IO--Thermostats
If the thermostat does not close completely when
cold, the engine will warm up slowly or not at all,
and heater performance
will
also be impaired. Poor
heater performance may also be due to the valve open-
ing at too low a temperature. Too high a valve open-
ing temperature or
a
valve that will not open can
cause overheating.
Removal
mostat level or below.
mostat housing using pliers Tool C-3250.
move the thermostat and housing.
Testing the Thermostat
(1) Visually inspect the thermostat to make
sure
the valve closes tightly. If the valve does not close
completely due to dirt, sand or other foreign ma-
terial, carefully clean the sealing edge making sure
the sealing edge is not damaged. If the valve does
not close tightly when clean, install a new thermostat.
(1)
Drain the cooling system down to the ther-
(2) Remove the upper radiator hose from the ther-
(3) Remove the thermostat housing bolts and re-
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