FAW Jiefang Automotive 485, Руководство по эксплуатации и техническому обслуживанию

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be off, and the cooling water flows through small-circulation pipe, without through heat-radiator,
and directly enters into water pump. Thus the small circulation in body is realized. When
water-out temperature is higher than 70
～
80
℃
, thermostat will be full on, and at this moment
cooling water flows via the thermostat to the upper water chamber of heat-radiator, and flows
along flat copper pipe, to the lower water chamber of heat-radiator. During this course, cooling
water is cooled by the fan. Thus the big circulation is realized. Heat-radiator is preferred to be
Model BJ130, with a heat-dissipation area of 10.62 m2.
Depending on use, the air fan can be of air-suction or exhaust type. Distance between end
face of fan and heat-radiator is preferred to be 45mm.
When water temperature is too low in winter, it is possible to be able to invert the
arrangement of blades, converting air-suction to exhaust type, facilitate heat-preservation for
engine.
Where it is very hot or when water temperature is too high in summer, the thermostat can be
removed, to increase the flow-rate of cooling water and raise heat-dissipation efficiency.
2. Water pump
The water pump is of centrifugal type. Its water-in chamber is at front end face of engine
body. The water pump is supported by two E60202 bearings. Water-seal is of ceramics graphite
design. Driven by crankshaft pulley fan belt, the water pump consists of pump body, impeller,
shaft, bearing and water-seal etc. See Fig.16. During its use, in case the water-seal is damaged and
the drain-hole below pump body has serious dripping, the water-seal should be replaced, and it is
not permitted that the leakage drain-hole is clogged; otherwise water will enter the bearing,
causing it soon to be worn off. The bearing, if giving abnormal noise while running, should be
preferred to be replaced.
The grease cup of water pump should periodically be added 4# calcium-based lube-grease,
according to requirement in "Maintenance". The lube-grease should not be too much; otherwise
overheating on bearing can be caused. It is suggested that the amount of lube-grease be approx.
1/2
～
1/3 of cavity of bearing.
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