The cooling system is of forcible
circulating water-cooled type,
see figure 12 for detail. The cooling system
contains radiator, water pump, fan, heat
retainer, air guide cover and etc.(diesel
engine without air guide cover and
radiator)
Cooling liquid in the radiator is
delivered to water channel by water
pump, and then enters into the
surrounding of the cylinder sleeve and
last flows into cylinder header by the cylinder sleeve. The used cooling liquid returns to
the radiator through heat retainer at the front of the cylinder head and the outlet pipe.
The heat retainer closes when the temperature of the water flowing out is less than
70℃, and the cooling liquid flows into inlet pipe of the water pump through a small
circulation on front plate of the cylinder, then it flowed into the water pump a second
time to realize a small circulation; when the water flowing out is 70℃～80℃,the heat
retainer opens, and the cooling liquid flows into the header tank of the radiator through
the heat retainer, and flows into the lower tank through a flat copper pipe. During the
process, the cooling liquid is cooled by the drafting or exhausted by the fan. Up to now, a
big circulation is completed. Air drafting or exhausting is adopted for the fan as required.
Water pump is a centrifugal type. The water pump is driven by fan belt surround the
shaft belt pulley. During use, if the water backfill is damaged, which leads to serious
water leakage in the lower part of the water pump, please change a new one. Do not
clock the water backfill if it is damaged, otherwise, it may enter into the bearing and
accelerate abrasion of the bearing. If some unusual noise be heard when bearing
operates, it should be changed. As the “Technical Maintenance” required, the
calcium-radical lubricant will be added to the Oil cup of the water pump regularly. The
lubricant should not be added more than 1/2～1/3 of cavum of the bearing, otherwise will
cause the bearing hotness. Hot retainer is a rival pipe and single valve type, contains
liquid sensitive to temperature which can auto control the valve’s operation.
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