Cleaning The Cooling System; Rust Prevention - International Harvester Company CUB Operator's Manual

COOLING SYSTEM
ADDING WATER TO THE COOLING SYSTEM (When
Equipped with Pressure-Type Radiator Cap) -Continued
Allow the engine to cool and fill the radiator
slowly to approximately 2-inches below the
top of filler neck I'C'I, Due to expansion, when
the system becomes hot, any excess water
will be discharged through overflow pipe I'E",
plug on the bottom (center) of the radiator
(1IIust.22). Allow the system to drain; then re-
place the plug.
RUST PRi:VEHTIOH
Note: Do not pour cold water into the radi-
ator if the engine is very hot, unless conditions
make it absolutely necessary; in which case
start the engine, let it idle. and slowly pour
water into the radiator.
One of the most common causes of engine
overheating is a rust-clogged cooling system.
Rust interferes with circulation and cooling,
which causes overheating.
The practice of flushing the system by forc-
ing water from a hose in the radiator filler
neck, without the use of cleaning solutions,
may be only a waste of time. Iron corrosion
is greater than that of any other cooling sys-
tem metal, which accounts for the large
quantities of rust found in neglected water
jackets. Heavy rust deposits in the water
jacket hold in heat and create local hot spots,
especially around the exhaust valve seats.
Under these conditions. the metal may get so
hot that the valves will stick or burn, or the
cylinder block or head may be damaged by heat
cracking.
CLEANING THE COOLING SYSTEM
Twice a year or more often, depending
upon the mineral content of the water used,
the cooling system should be drained and
thoroughly flushed. This is particularly im-
portant before using an antifreeze solution.
If the engine is to be operated in freezing
temperatures. refer to "Cold Weather Pre-
cautions" on page 55. For cooling system capa-
cities, refer to page 74.
Unless the cooling water is treated with a
corrosion preventive, rust and scale will even-
tually clog the passages in the radiator and
water jacket. This condition is aggravated in
some localities by the formation of insoluble
salts from the water used.
Drain the cooling system by removing the
IH Cooling System Cleaner, dissolves rust,
scale, and sludge and retards future corrosion
when used according to the directions on thecontainer.
Note: Do not use chemical mixtures to stop
radiator leaks except as a temporary measure
in an emergency. Instead, have the radiator
repaired.
If the radiator is clogged with insoluble salt
formations, take it to a reputable concern
specializing in the removal of such formations.
Reliable radiator service stations are familiar
with local conditions and are equipped to apply
the proper treatment.
In localities where alkaline, acid, or saline
waters are the only kind available, the addition
of a rust preventive or "inhibitor" will tend to
minimize the corrosive action of such water.
Illust. 22
Cooling system.
22