Presented By :-Yajurvendra Singh TomarRoll no. -120106287

The burning air-fuel mixture in the engine cylinders

may reach high temperature. This means engine parts get hot. However, cylinder walls must not reach hotter than about 500°F [260°C], higher temperatures causes lubri cating oil to break down and lose its lubricating ability. Other engine parts are also damaged. To prevent over heating, the cooling system removes the excess heat. The cooling system keeps the engine at its most efficient temperature at all speeds and operating conditions. It also helps bring the engine up to normal operating temperature as quickly as possible. In addition, the cooling system provides a source of heat for the passenger-compartment heater-and-air- conditioner.

Introduction

Cooling System uses five basic parts:-

Water Jacket Water Pump Thermostat Radiator Fan

Water Jacket

The water jackets are open spaces between the cylinder walls and the outside shell of the block and head. Coolant from the water pump flows first through the block water jackets. Then the coolant flows up through the cylinder-head water jackets and back to the radiator.

Water Pump The pump draw coolant from the bottom of the radiator. They force the coolant through the pump outlet to the water jackets.

Components of cooling System

Thermostat

The thermostat is a heat-operated valve that regulates coolant temperature. It does this by controlling coolant flow from the engine to the radiator. The thermostat is in the coolant passage between the cylinder head and the radiator. The valve in the thermostat opens and closes as coolant temperature changes. When the engine is cold, the thermostat closes. As the engine warms up, the thermostat opens. This prevents or allows coolant to flow through the radiator.

Radiator The radiator is a heat exchanger that removes heat from engine coolant passing through it. The heat transfers from the hot coolant to the cooler outside air. An automotive radiator has three main parts.

These are a radiator core, and inlet and outlet tanks. The cores are usually made of aluminium. The tanks may be made of plastic or metal. The core has two sets of passages, a set of tubes, and a set of fins attached to the tubes. The tubes run from the inlet tank to the outlet tank. Coolant flows through the tubes and air flows between the fins. The hot coolant sends heat through the tubes to the fins. The outside air passing between the fins picks up and carries away the heat. This lowers the temperature of the coolant. The coolant flows from the upper tank down through the tubes to the lower tank.

Engine Fan The radiator sometimes needs additional airflow through it to prevent the engine from overheating. This usually occurs at idle and slow speed. At higher vehicle speeds, the air rammed through the radiator by the forward motion of the vehicle provides all the cooling that is needed.

Antifreeze Antifreeze is a chemical additive which lowers the freezing point of a water-based liquid. An antifreeze mixture is used to achieve freezing-point depression.

.Most automotive engines are "water"-cooled to remove waste heat, although the "water" is actually antifreeze/water mixture and not plain water. Water pump seal lubricant is also added.

The cooling system is a system of parts and fluid that

work together to control an engine’s operating temperature for optimal performance. The system is made up of passages inside the engine block and heads, a water pump to circulate the coolant, a thermostat to control the temperature of the coolant, a radiator to cool the coolant, and hoses to transfer the coolant from the engine to the radiator.

The liquid that flows through a cooling system, antifreeze, or commonly referred to as coolant, withstands extreme hot and cold temperatures.

Working

Coolant follows a circulation path that begins

with the water pump. The water pump draw coolant from the radiator and push it into the engine block. Pumps are usually fan. Nowadays, they may even be driven electrically. If the water pump experiences a leak from the seal, it can compromise the entire cooling system, causing the vehicle to overheat.

As coolant flows through the system, it picks up heat

from the engine before arriving at the thermostat. The thermostat is a valve that measures the temperature of the coolant and opens to allow hot fluid to travel to the radiator. If the thermostat becomes stuck and quits working, it will affect the entire cooling system.

Once released by the thermostat, hot coolant travels through a hose to be cooled by the radiator. It passes through thin tubes in the radiator. It is cooled as air flow is passed over the outside of the tubes.

Need Cooling system is one of the most important

parts of the automobile; it dissipates the extra heat out of the engine which can damage the various components of the engine. The temperature of the engine reaches high enough to weld the piston with the cylinder which can damages the engine. So the cooling system keeps the various components of the engine cool and safe.