Page 181 - Mechanic Diesel - TT

MECHANIC DIESEL - CITS

Study about cooling systems and its components such

as radiator, pressure cap, types of hoses, types of water
pump, electric fan, thermostat, fan belts, temperature

gauge, temperature sensor etc

Objectives: At the end of this lesson you shall be able to

• explain about cooling systems and its components.

Types of cooling system and its component

The following cooling systems are used to cool the internal combustion engine or keep it at normal temperature.
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.

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 and water jackets are made to collect it around the engine cylinder.
The water from the radiator goes into these water jackets through a 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.

Types of water-cooling systems
Water cooling systems are of the following types:
i Thermo-siphon system
ii Pump circulation system
i Thermo-syphon System: In the thermo-siphon system, the radiator is filled with water, just like the Ford
circulation system. This radiator is made almost like the radiator of Ford Circulation System, but water pump
is not used in this system. Generally, in the thermo-siphon system, a radiator is installed in front of the engine,
the cold water from the radiator goes to the engine block through the hose pipe below it. From here, the water
gets heated and enters the upper tank of the radiator through a pipe from the engine head through the water
jacket or water passage. and control
The air coming in contact with the radiator fins reduces the temperature of the water and the cooled water from
the tubes installed in the radiator enters the lower tank of the radiator by gravity.

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CITS : Automotive - Mechanic Diesel - Lesson 47 - 56