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MAINTENANCE
COOLING SYSTEM
111ust.
q.q.
Circulation of the coolant.
Operation
The cooling system automatically
main-
tains the most desirable
engine temperature
under all normal conditions of operation.
A
centrifugal pump circulates
the coolant
through the engine block, cylinder head and
radiator.
When the engine is started cold,
4 thermostats
of the by-pass type "block
off" circulation to the radiator,
causing the
coolant to circulate
only through the cylinder
heads and around the cylinders,
as indicated
~-=f1Ii'., by the black arrows
t
Ll l
us t .
44).
As the
) . 'engine warms up, the thermostats
gradually
"ryen. When efficient operating temperature
has bt:.V1. reached, the thermostats
are wide
open and l),e by-pass is closed, allowing the
coolant to cilculate through the engine block,
cylinder heads and radiator,
as indicated by
the white a r r owz, Capacity of the entire cool-
ing system is 37 gallons (U. S. measure).
Cooling System Is Closed Type
~
This is a closed cooling system of the
.&.
".
pressure
type, allowing the tractor
to oper-
'.7"
ate at extreme angles without loss of water
through the overflow pipe.
The system is
designed to open the valve at the overflow
pipe at approximately 4 lb. pressure.
The
system must have all connections tight at
all times.
The radiator
cap is designed to
hold pressure.
If connections are not tight
or if the radiator
cap is loose, satisfactory
pressure
will not be maintained, and loss of
water and consequent overheating will re-
sult.
Maintenance and Rust Prevention
Before the tractor
is operated, preven-
tive maintenance procedures
must be per-
formed on the cooling system in order to
maintain its original efficiency.
The water
used should be clean and free from alkaline
substances.
Treatment of the water with
rust inhibitor compounds will greatly re-
duce rusting of the iron in the cooling
system.
Rust inhibitor compounds are
inexpensive and simple to use and should be
added to the water in the proportions
recommended by their manufacturers.
Thoroughly clean the cooling system,
fill it nearly full with clean water, and add
the recommended amount of rust inhibitor.
Operate the engine to raise the tempera-
ture of the coolant, so as to open the ther-
mostats and establish circulation through-
out the entire system for complete mixing.
It is recommended that the cooling
55
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