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 b. Testing.
(2) Never add antifreeze to a cooling sys-
tem containing corrosion inhibitor.
(1) Fill a container with sufficient water
The cooling system must be cleaned
to cover the thermostat.
and flushed (b above) to remove all
(2) Suspend a reliable thermometer in the
traces of corrosion inhibitor before
water.
adding antifreeze.
(3) Place the container over a heat source
(3) Add a sufficient quantity of ethylene
and stir water occasionally for even
glycol to the cooling system to provide
protection at the lowest expected tem-
(4) Thermostat should start to open in the
perature.
temperature range of 162 to 172 F.
and should be completely open between
(4) Add water as necessary to the ethylene
190 and 192 F.
glycol, then run engine and allow
coolant to reach operating tempera-
(5) Remove thermostat from water and
ture. Check strength of the solution
within a short time the thermostat
with a hydrometer.
should start to close.
(6) Discard thermostat if it fails to pass
e. Removal.
test.
(1) Remove overhead guard.
c. Installation. Reverse procedure in a above,
(2) Disconnect tail and stoplight wires at
Use a new gasket and cement in place. Tighten
connectors, then remove counter-
hose clamp and check for leaks with engine
weight.
running.
(3) Drain cooling system (a above).
(4) Remove upper and lower radiator
hoses.
a. Inspection. Visually inspect for leaks or
signs of wear.
(5) Disconnect transmission oil cooling
lines.
(6) Remove screws fastening radiator to
(1) Drain cooling system (para. 32a).
radiator supports, then remove radi-
(2) Remove upper radiator hose and dis-
ator supports, then remove radiator.
connect the lower hose at the pump.
(3) Remove recirculating tube.
f. Installation. Reverse procedures in e above.
(4) Loosen screw fastening adjusting
Caution: Use extreme care when installing
brace to generator and slip fan belt off
the counterweight so as not to bump the radi-
generator pulley.
ator. Make sure all hoses and lines are tight.
(5) Loosen locknut, then unscrew power
steering pump adjusting screw suf-
33. Thermostat
ficiently to allow removal of power
a. Removal. The thermostat is located in the
steering pump drive belt.
water outlet elbow (fig. 5) attached to the
(6) Slip fan belt over fan blade and re-
cylinder head, remove as follows:
move.
(1) Open radiator drain valve and drain
(7) Remove screws and washers fastening
cooling system until the level in the
pump to block, then remove pump and
radiator is below the water outlet el-
fan as an assembly.
bow.
(8) Remove old pump gasket.
(2) Disconnect upper radiator hose at
c. Installation. Reverse procedure in b above.
water outlet elbow.
Use a new mounting gasket.
(3) Remove two nuts and lockwashers se-
curing the elbow, then lift off elbow
fore installing power steering pump drive belt. Check
and gasket. Remove thermostat.
carefully for leaks after filling cooling system.
AGO 6217A
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