Lonking LG833NG, Руководство пользователя

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overall engine. Therefore to properly maintain the engine cooling system 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.
5.5.1 COOLANT 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 water-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
shall 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 shall 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 moment, 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 antifreeze is flammable, do not close to the naked fire.
③
Additives
Warning