is extremely important, the engine overheat and over-cold, piston and piston ring and
cylinder liner are locked deadly, thermal fatigue crack occurs on the cylinder head,
lubricants quickly degenerate, spot eroded, air eroded and others faults are common
failures in the cooling system, they will not only cause the overall deterioration of power,
economical efficiency, reliability and durability of the engine, but also cause serious
damage to the engine.
5.7.1
5.7.1
5.7.1
5.7.1 COOLANT
COOLANT
COOLANT
COOLANT COMPOSITION
COMPOSITION
COMPOSITION
COMPOSITION
The coolant of the engine is composed and with water, antifreeze liquid and additives in
certain proportion.
LONKING recommends using the mixture of 50% ethylene glycol or propylene glycol-
based antifreeze and 50% soft water as the coolant of the engine in most weather
conditions.
① Water used in the coolant
The water used in the coolant must be soft water (distilled water is preferable), and
prohibit to use the untreated water as the coolant of the engine. Hard water or the water
containing with calcium and manganese ions with a high rate is apt to produce w ater-
insoluble compounds and prone to generate furring in the water jacket of
t
the engine,
causes blocking waterways, heat transfer hindered, and results in engine overheating;
while the water containing higher rate of sulfate or chloride-containing will be corrosive.
② Anti-freeze fluid
Antifreeze has the double features of antifreeze and anti-boiling, has anti-corrosion and
other functions as well. Therefore, when the engine is working
at
a relatively low
temperature, the antifreeze should be used in order to prevent the water freezing in the
cooling system of the engine, to avoid the engine overheating due to the termination of
cooling water circulating, or to keep the body, cylinder cover and heat radiator from
expanding and cracks as the water freezes with the expanded v size. Along with the mass
ratio increasing in the antifreeze coolant, the boiling point of coolant increases, the
freezing point lowers. The antifreeze concentration should not exceed 68.1% (the freezing
point is of -68 ℃ ), otherwise the performance will be worsened: the freezing point of
coolant will rise instead, and
it
is easy to form a gel. The normal concentration range is of
40% to 60%, 50% of the concentration of antifreeze cooling fluid is recommended,
at
the
mome nt, the freezing point of the coolant is of -35.5 ℃ , while the boiling point
at
atmospheric pressure is of under 103 ℃ , the boiling point in the cooling system is of about
110 ℃ .
As
As
As
As antifreeze
antifreeze
antifreeze
antifreeze is
is
is
is flammable,
flammable,
flammable,
flammable, do
do
do
do not
not
not
not close
close
close
close to
to
to
to the
the
the
the naked
naked
naked
naked fire.
fire.
fire.
fire.
③ Additives
Usually the additives contain anti-rust agent, foam suppressing agent, coloring agents etc.
Warning
Warning
Warning
Warning
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