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Diesel engines D-260.1S3А, D-260.2S3А, D-260.4S3А. Manual - part 3

Continuation of Table 6

Units, parts

Engine model

D-

260.1S3А

D-

260.2S3А

D-

260.4S3А

Unit, part designation and (or) its description

Clutch

Friction type, dry, constantly closed-type, double-disk* or single disc or not available

Friction type, dry, constantly closed-type,

double-disk

Alternator

AC, rated voltage 14V or 28V

Starter

Rated voltage 24V***

Start-up aids

Diesel engines are equipped with pin glow plugs with rated voltage of 23V and have locations for heat carriers inlet and outlet when a
pre-start heater is installed

Note
*- for tractor engines;
**- to be installed by customer;
***- to be installed by customer on the engines going to MTZ tractors;
The D-260.1S3A diesel engine appearance is shown in Fig.1.
Spare Parts, Tools & Accessories Kit list - See Annex "B" to this Manual (Table B.1)

Fig.1 - Diesel engine D-260.1S3A

1.1.4 Design and operation

Engines D-260.1S3A, D-260.2S3A, D-260.4 S3A are 4-stroke internal combustion pis-
ton diesel engines with vertical cylinder positioning, direct fuel injection and ignition by
compression.

The basic engine assembly units are: cylinder block, cylinder heads, pistons, connecting
rods, crankshaft and flywheel.

To ensure high technical and economic characteristics the engines inlet systems use
turbo charging with charge air intermediate cooling.

Using turbocharger with controlled air pressure in the charging device allows better
engine pickup provided by higher torque values at low crankshaft speeds.

Engines equipped with "Common Rail" accumulator type fuel system show higher op-
erational and fuel economy and conform to Tier-3A ecological parameters due to opti-
mized operation process and minimization of transitional processes while changing the
speed and load modes.

1.1.4.1 General information

Engines D-260.1S3A, D-260.2S3A, D-260.4 S3A are 4-stroke piston internal combustion
diesel engines with vertical cylinder positioning, direct fuel injection and ignition from
compression.
The basic engine assembly units are: cylinder block, cylinder heads, pistons, connecting
rods, crankshaft and flywheel.

To ensure high technical and economic characteristics the engines inlet systems use turbo
charging with charge air intermediate cooling.
Using turbocharger with controlled air pressure in the charging device allows better en-
gine pickup provided by higher torque values at low crankshaft speeds.
Engines equipped with "Common Rail" accumulator type fuel system show higher opera-
tional and fuel economy and conform to Tier-3A ecological parameters due to optimized
operation process and minimization of transitional processes while changing the speed
and load modes.
Using exhaust gas recirculation devices in the engines feed system also contributes to
reaching the required ecological parameters, bringing changes into the mass charge con-
tents entering the engine cylinders by way of partial deliver of exhaust gas.
To ensure engine start-up at low ambient temperatures, glow plugs are installed in the
engine cylinder head, while fuel liquid heat exchanger ensures a faster reaching of the op-
timal oil temperature in the engine lubrication system and keeping it at the required level
during the engine operation.

1.1.4.2 Diesel engine operation principle and its basic components interaction

A diesel engine operation principle, like with all other internal combustion engines, is
transformation of heat energy of the fuel burning inside in the working cylinder to me-
chanical energy.
When a piston moves down at the intake stroke through the open inlet valve an air charge
comes into the cylinder. When the inlet valve closes and the piston moves upwards the air
compression takes place. At this the air temperature goes up sharply. In the end of the
compression stroke fuel is delivered through an injector into the cylinder under high pres-
sure. While being injected, fuel is finely sprayed, mixed with hot air in the cylinder and
evapourated, thus making a fuel-air mixture.
The air-fuel mixture ignition during the diesel engine operation is achieved as a result of
air compression to the extent of the air-fuel mixture self-ignition.  The fuel is injected by
injectors with fast operating electromagnetic valves. The moment of injection beginning
and its duration are determined by the moment of beginning and duration of voltage sup-
ply to the electromagnetic valve by the Common Rail system Electronic Control Unit. The
fuel-air mixture burning takes place at the moment of the piston starting to go down.
As soon as the fuel-air mixture is bunt down the process of cylinder expansion and clean-
ing begins through the exhaust valve.
Opening and closing of the intake and exhaust valves is coordinated by the gas distribu-
tion mechanism.
With the diesel engine operation start the turbocharger is actuated by the exhaust gas en-
ergy.
The diesel engine start is done by imparting rotation to the crankshaft by the electric
starter via the flywheel mounted on the crankshaft flange.
The diesel engine cooling system water pump is drive is maintained from the belt of the
pulley mounted on the crankshaft toe to the pulley mounted on the water pump shaft.

The А29.05.000 БЗА compressor drive and that of the gear pump is maintained by the

toothed transmission of the distribution mechanism.

The transfer of energy (power) generated bythe diesel engine to the drive of tractor (agri-
cultural machine) in which it is installed is done from the engine flywheel via the clutch.

1.1.4.3 Tools and accessories
To ensure the maintenance work on checking and adjusting the gap between the rocker
striker and the valve end, done in the course of technical service, tools are attached ac-
cording to the list in  table B.2 of Annex B.

1.1.5 Diesel engine labelling
The brand tag of each engine fixed to the cylinder block bears the following data:
-manufacturer’s name and its trade mark;
-engine model (modification);
-engine serial production number;

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