Cooling System - FAW Jiefang Automotive 485 Operation & Maintenance Manual

The filter can periodically be replaced. The filter is equipped with safety valve. In case of
clogging, open the safety valve to let oil enter into main oil-passage, but this will make it lose
filtering effect. Therefore, it is necessary to periodically clean and replace the filter element, as per
requirement in "Maintenance".
3. Oil-drain screw plug
This screw plug is located at lower right bottom in crankcase sump. Each time engine-oil is
changed, remove the screw plug and drain completely the oil, then clear up the iron filings and
impurities. Before adding engine-oil, it is necessary to check the oil-drain screw plug if any oil
leakage.
Cooling system is of forced-circulation loop water-cooling type.
Cooling system includes heat-radiator, water pump, air fan, thermostat and wind-guide hood
etc.
1. Cooling water passage (See Fig.15)
1-Heat-radiator
Cooling water in heat-radiator is pumped by the water pump, into main water-passage, and
directly enter into the cylinder cover. Then, via water-in guide, one branch of it firstly cools the
triangular area of valve and combustion chamber, while the other branch enters tangentially the
outer area of cylinder jacket, and then enters around cylinder jacket to the cylinder cover. Worked
cooling-water all flows from the front end of cylinder cover, via thermostat and water-out pipe,
then back to heat-radiator. When water-out temperature is lower than 70℃, the thermostat will
IX. Cooling system
2-Thermostat 3-Air fan
Fig. 15 Cooling system
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4-Water pump 5-Water-in pipe