checked
and
replaced,
if
found
4. Connect the water hose of the gun to
defective.
the water outlet and the air hose to the
compressed air outlet.
When water connection seals and hoses
are i n s t a l l e d b e s u r e t h e c o n n e c t i n g
5. Turn on the water and, when the ra-
parts are properly aligned and the seal
diator is full, turn on the air in short
or hose is in its proper position before
blasts.
tightening the clamps. All external leaks
should be corrected as soon as detected.
NOTE
The fan belt must be adjusted to provide
the proper tension and the fan shroud
Apply air gradually. Do not exert
must be tight against the radiator core to
more than 30 psi (207 kPa) air
prevent recirculation of air which may
pressure. Too great a pressure
lower the cooling efficiency.
may rupture a radiator tube.
C o n t a m i n a t e d Engine
6. Continue flushing until only clean wa-
ter is expelled from the radiator.
When the cooling system or lubricating
system becomes contaminated, it should
Reverse-flush the cylinder block and cyl-
be flushed thoroughly to remove the con-
inder head water passages as follows:
taminants before the engine is seriously
damaged. One possible cause of such
1. Remove the thermostat and the water
contamination is a cracked oil cooler
pump.
core. In such a case oil will be forced
into the cooling system while the engine
2. Attach a hose to the water inlet of the
i s o p e r a t i n g , and coolant will leak into
cylinder block to drain the water away
the lubricating system when the engine
from the engine.
is stopped.
3. Attach a hose to the water outlet at
Coolant contamination of the lubricating
the top of the engine and insert the
system is especially harmful to an engine
flushing gun in the hose.
during the cold season when the cooling
system is normally filled with an ethylene
4. Block the bottom opening and fill the
glycol antifreeze forms a varnish which
coolant passages with water; then un-
quickly immobilizes moving engine parts.
block the bottom opening and blow the
water from the engine with full air pres-
To remove such contaminants from the
sure from the flushing gun.
engine, both the cooling system and the
lubrication system must be thoroughly
5. Again fill the engine cooling system
flushed as outlined below:
with water and blow clean with full air
pressure. Repeat this procedure until
the flushing water runs clean.
COOLING SYSTEM
If the scale deposits in the radiator can-
If the engine has had a failure resulting
not be removed by chemical cleaners or
in the contamination of the cooling sys-
reverse-flushing, it may be necessary to
tem with lubricating oil, the following
remove the upper tank and rod out the
flushing procedure is recommended:
individual radiator tubes with flat steel
rods. Circulate water through the radi-
1. Prepare a mixture of Calgon, or its
ator core from the bottom to the top
Equivalent, and water at the rate of two
during this operation.
ounces (dry measure) to one gallon of
water.
M i s c e l l a n e o u s Cooling System Checks
2. Remove the engine thermostat to per-
mit the Calgon and water mixture to cir-
In addition to the above cleaning proce-
culate
through
the
engine
and
the
dures, the other components of the cool-
radiator.
ing
system
should
be
checked
periodically to keep the engine operating
3. Fill the cooling system with the Calgon
at peak efficiency. The thermostat and
solution.
the radiator pressure cap should be
