RADIATOR
The radiator core has three rows
of
tubes (four
rows on
510)
with copper fins.
Two strips
of
sponge material are glued to the
outer side
of
the radiator (Item
9,
Fig. A.VI/3.)
their purpose being
to
block the warm air pro-
duced by the cooling
of
the coolant from flowing
back
into
circulation.
The
outflow
of
coolant vapor which accumulates
inside the radiator is provided by a plastic tube
(Item
10)
connected
to
a hole which is drilled
through the water
filler
neck.
Two valves are incorporated in the radiator cap:
one compression (Item
11)
and one vacuum valve
(Item 1
2).
The compression valve tends
to
open
when, with tractor in motion, the coolant
temperature rise inside the
circuit
sets up inter-
nal pressure exceeding 5 to
7.4
P.S.I.
(50,7
kPa);
at this point the valve tends to be lifted allowing
the excess vapor to flow out along the plastic
tube (Item
10).
The vacuum valve starts working by
effect
of
the
decreased coolant temperature which results in
a pressure drop inside the circuit. The valve
lowers and lets air in to re-establish the pressure
balance.
First drain the coolant then remove the radiator
as follows:,
1.
Remove the grille.
2.
Remove the battery after disconnecting the
ground cable.
3.
Remove the grille, complete.
•
4.
Remove the frame together with air cleaner
after slackening the air suction hose band
clamps, and removing the four attaching
capscrews
to
the axle support.
Make sure the radiator functions
efficiently
by
checking for obstructions or clogging inside and
outside the radiator core.
The correct
flow
rate
is
28
GPM
(105.91/mln).
FIG. A.VI/3 RADIATOR
9.
Air sealing sponge rubber elements; 10. Water· .
vapor
vent
tube;
11.
Compression
valve;
12. Vacuum valve; 13. Plug
Descale the system as follows:
1.
Make a solution
of
3.64
oz.
per gallon
of
sodium bicarbonate in warm water.
2.
Filter
it
through a cloth.
3.
Pour it in the radiator, drain
it
and flush
thoroughly.
4.
Check radiator tightness, in case
of
leakage,
by immersion inside a tank filled with water
at 68°·104°F. (30°
± 10°C.) and blowing
compressed air into
it
at approximately 14.2
PSI
(98
kPa)
for about two minutes. Check for
air bubbles, and repeat three times.
We
do not recommend
limiting
the washing
to
the radiator alone as
it
should always
be
extend-
ed to the entire cooling system supplying the
engine with the type
of
solution and in the man-
ners previously indicated. Work the tractor for
about one hour before draining the coolant, with
engine stopped.
The circuit should always be flushed and filled
with
anti-freeze
to
suit
climate need.
Fill the radiator up
to
about
:tt."
(2
em.) below the
over·flow exhaust hole (Item
10).
Engine·
441
)
I
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