Cold Weather Precautions; Magneto Impulse Coupling; Draining And Refilling The Cooling System - International Harvester Company CUB Operator's Manual

If an antifreeze is to be used:
When operating the tractor in temperatures
of +32 degrees F. or lower, observe the fol-
lowing precautions:
FUEL SYSTEM
1. Inspect the hose connections. They must
be in good condition both inside and out. Then
tighten all water connections.
Use only a high-test, winter-grade gasoline
for starting, and keep your supply in a closed
container so the more volatile portion does
not evaporate.
2. Inspect the fan belt and adjust it, ifnecessary,
to the proper tension. If the belt
is worn, or oil- soaked, install a new one.
3. Drain the cooling system as described
above. Clean it as described on poge 22. Fill the fuel tank at the end of the day's run
to prevent condensation in the tank.
LUBRICATION
4. Check to be sure that the radiator drain
plug is tightly closed. Then fill the cooling
system, using either of the following proce-dures:
Be sure to use lubricant of the correct
viscosity in the engine crankcase as specified
in the "Lubrication Table".
a. Make a solution of the required amount
of IH permanent type antifreeze with the nec-
essary amount of clean water (use soft or rain
water if possible) to fill the cooling system.
Fill the cooling system to a level slightly be-
low the bottom of the radiator filler neck, when
equipped with a nonpressure-type radiator cap;
or to a level approximately l-inches below the
top of the filler neck, when equipped with apressure-type
radiator cap.
MAGNETO IMPULSE COUPLING (Tractors with Magneto)
For satisfactory starting, it is important
to keep the magneto impulse coupling oiled
liberally. The impulse coupling should be kept
free of dirt and gummy rust formation.
b. Put the required amount of antifreeze
into the cooling system. Fill the cooling sys-
tem with clean water (use soft or rain water if
possible) to a level slightly below the bottom
of the filler neck, when equipped with a non-
pressure-type radiator cap; or to a level ap-
proximately 2-inches below the top of the filler
neck, when equipped with a pressure-type radi-
ator cap. Start the engine and run it until oper-
ating temperature is reached, to allow the anti-
freeze and water to mix thoroughly.
When the engine is hand-cracked, the im-
pulse coupling should trip (click) twice for
each revolution of the engine. Failure to do so
may indicate the need for cleaning. Refer to
poges 27 to 30 for further information.
COOLING SYSTEM
When the temperature is likely to be +32
degrees F. or lower, there is danger of the
water freezing in the cooling system.
5. Check the cooling system for leaks, pay-
ing special attention to the hose connections.
To prevent this, drain the water from the
cooling system at the end of each run or use
IH permanent type antifreeze.
Draining and Refilling the Cooling System
If an antifreeze is not to be used:
Antifreeze Solutions
1. Remove the radiator drain plug on the
bottom (center) of the radiator.
The use of alcohol as an antifreeze is not
recommended because methanol boils at +148
degrees F. However, if it is necessary to use
alcohol, check the solution frequently to make
certain you have adequate protection for the
prevailing temperature.
2. See that the drain is not clogged and that
the water drains completely. Then replace the
radiator drain plug.
Note: Before filling the cooling system in
freezing weather, cover the front of the radia-
tor. Have sufficient water available at the
tractor to fill the cooling system (warm water
is prefe rable). Start the engine. then put the
water in immediately. This keeps the water from
freezing during warm-up. Maintain the oper-
ating temperature of the engine by uncovering
as much as necessary of the front of the radi-
ator.
Note: Use only one type of antifreeze solu-
tion. Do not mix solutions, as it will be diffi-
cult to determine the exact amount of protec-
tion.
Never use any of the following in the cooling
water as an antifreeze -honey, salt, kerosene,
fuel oil, glucose or sugar, calcium chloride,
or any alkaline solution.
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