Technical data

OPERATION&MAINTENANCE MANUAL
9、cooling system
Fig12 Cooling system
1 radiator 2 heat retainer 3 fan 4 water
pump 5 inlet pipe
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°C, 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°C～80°C,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
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