BELARUS-1523/1523
В
/1523.3
/1523В.3
Construction and Operation
67
The Engine Cooling System
is of a
closed liquid-type with forced circulation
of the fluid. The system consists of a
cooling jacket, water pump, radiator, fan
with automatically controlled viscous
coupling, two thermostats, expansion
bottle, connecting hoses, and drain taps.
1 – engine attachment bracket; 2 – water pump branch pipe; 3 – water radiator mount rubber damper; 4 –
water-pump drive belt; 5 – bottom radiator tank; 6 – water drain tap of the radiator; 7 – water-pump belt
tensioner idle pulley; 8 – automatic tensioner spring; 9 – automatically switched fan assembled with the
coupling; 10 – water radiator core; 11 – fan forced-engagement mechanism detent; 12 – top radiator tank;
13 – water-radiator filler cap; 14 – air-vapour tube; 15 – expansion bottle; 16 – coolant temperature sen-
sor; 17 – coolant temperature warning sensor; 18 – engine coolant temperature indicator (with a coolant
temperature warning lamp); 19 – water-pump fan impeller; 20 – cylinder block water jacket cavity; 21 –
water accumulation tube; 22 – passageways directing the coolant jets of the cooling system; 23 – eye-
bolt; 24 – plug; 25 – cylinder block fluid drain tap (located on the opposite side of the engine); 26 – oil-to-
fluid heat exchanger.
The thermal condition of the engine is
regulated by changing the amount of air
passing through the cooling system ra-
diator as well as with the help of two
thermostats.
The coolant temperature is monitored by
means of the remote temperature indica-
tor and audible and light alarms whose
sensors are located in thermostat covers.
The normal heat condition of the engine
corresponds to coolant temperature of
80…97
°
C.
The engine lubricating oil is cooled in the
oil-to-fluid heat-exchanger built into the
engine block. To control the oil pressure,
the sensors of the oil pressure gauge
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