Page 175 - Mechanic Diesel - TT

MECHANIC DIESEL - CITS

1 AIR COOLING SYSTEM
In the air cooling system, air is used to cool the engine to normal temperature. In this system only air cools the
cylinder head and block with the help of fins and blower. In this, many tapers and thin fins are made around
the cylinders of the engines to be cooled. Due to these fans, the area of air accumulated around the cylinder
increases. Due to these feathers being thin at the edge, they cool down quickly in contact with air. The efficiency
of the air cooling system depends on the surface area of the fans used in the engine, the amount of air, its velocity
and the temperature to be cooled. This system is used in two or three wheeled vehicles, airplane engines and
small stationary engines.

Advantage
1 This cooling system is easy to maintain.
2 There is no possibility of water freezing in this system.
3 In this system, there is no additional weight of water pump, radiator and fan etc. in the weight of the engine.

4 In this system, casting of the cylinder can be done easily, because water jacket does not have to be made
in it.
5 In this system the engine quickly comes to its normal temperature.
Disadvantages

1 Due to this the engines make more noise.
2 This reduces the efficiency of engines.
3 Under this system, larger fins have to be made in larger engines.
4 Under this system the engines are able to cool down gradually.
2 Water cooling system

Under the water cooling system, water is used to eliminate unnecessary temperature of the engine. Water is filled
in the radiator ray to collect water around the engine cylinder.
Water jackets are made. The water from the radiator goes into these water jackets through rubber hose pipe and
the heat from the cylinder is transferred to this water.
The water takes the heat from the cylinder and returns to the radiator, where it cools down and then goes back
into the water jackets of the engine. Similarly, this cycle of water remains continuous while the engine is running
and the engine continues to run at its normal temperature.
Water cooling systems are used in water cooling systems based on conveying water from the radiator to the water
jacket and back to the radiator.
Advantage
Following are the main advantages of water cooling system
1 The engines in this system are of compact design.
2 Fuel consumption in engines of this system occurs at high compression.
3 Through this system, the temperature of the cylinder head and valve seat of the engine can be easily reduced.
4 The design of this system does not depend on the size of the engine.

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CITS : Automotive - Mechanic Diesel - Lesson 47 - 56