System Of Engine Air Cleaning - Belarus 1822.3 Operator's Manual

Nozzle 14 is intended for fuel injection into the engine cylinder. It provides the re-
quired fuel spraying and limits the beginning and end of fuel supply.
Coarse-mesh filter serves for preliminary fuel purification from mechanical impurities
and water. Fine filter serves for final fuel purification. While passing through shutters of the
changeable paper filter cartridge, fuel is cleaned from impurities.
Air inlet pipe includes an air cleaner (see subsection 3.1.2 "System of engine air
cleaning") and branch pipes connecting the air cleaner with the turbocharger, charged air
cooler (see subsection 3.1.3 "System of charged air cooling") and the inlet manifold. Under
the influence of depression created by the engine turbocharger, air is cleaned from dust
passing through the air cleaner, and is supplied to the turbocharger discharge chamber
from which it is supplied under pressure through the charged air cooler to the engine cylin-
ders.
Cooling system is of closed type, with forced circulation of cooling liquid from the
centrifugal pump. Water pump 10 (figure 3.1.1) starts rotational movements under the in-
fluence of cone belt from crankshaft 4 pulley. Two thermostatic regulators are mounted at
the delivery line in the housing of thermostatic regulators 11, and serve for speeding up of
the engine warm-up after startup and automatic adjustment of temperature mode at differ-
ent loads and ambient temperatures.
Fan 9 of the cooling system is mounted on the shaft of water pump 10.
An adjustable turbocharger using the energy of exhaust gases to boost air charging
into the engine cylinders, is mounted onto engine -260.4S2 / -260.9S2. The principle of
the turbocharger operation is that exhaust gases from the engine cylinders go under pres-
sure through the outlet manifold to the turbine scroll passages. While expanding gases
move the turbine wheel with the shaft, at the other end of which compressor wheel intakes
air through the air cleaner and supplies it under pressure to the engine cylinders. Rotor
speed, charged air supply and pressure depend on the engine operation mode. Charging
adjustment is carried out by blowing-off part of exhaust gases past the turbine wheel while
exceeding charging pressure of the specific value.
Overflow valve is built into the turbine housing of adjustable turbocharger 6 (figure
3.1.2). The overflow valve lever is connected by means of adjustable rod with the actuating
mechanism which is linked by means of the air pipeline with the compressor outlet. Regula-
tor adjustment for specific pressure is carried out by the rod length adjustment. Changing
of the rod length of the turbocharger actuating mechanism during the operation process is
not allowed!
The device of the engine startup consists of electric starter 20 with rated voltage of
24V. The starter is a direct current motor with compound excitation having an electromag-
netic relay and the drive mechanism.
To provide startup at low ambient temperature all engines are equipped with heating
plugs 19 with rated voltage of 23V.
Alternator serves for AB recharge and also for direct current supply to all electric en-
ergy consumers mounted on the tractor. Alternator drive is carried out by means of the
cone belt from the crankshaft pulley. The alternator is mounted on the engine right side
above the HSC operating pump.
To provide the trailer pneumatic brakes drive and tire inflation, tractor engine is
equipped with the piston single-stage pneumatic compressor of air cooling. The compres-
sor is mounted on the distributor cap flange and has a drive from the compressor drive
gear of the distribution mechanism.
To provide HSC operation, a gear-type pump is mounted on the engine. The pump
starts rotating under the influence of the drive from engine timing gears. The HSC operat-
ing pump is mounted on the right side of the engine, under the alternator.

3.1.2 System of engine air cleaning

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