Page 119 - Mechanic Diesel - TT

MECHANIC DIESEL - CITS

Carburetor is a device which takes petrol from fuel pump in liquid form, converts it into vapors and mixes it with
air in correct proportion in engine and enters the cylinder in the intake stroke. The mixture of air and petrol called
a fresh charge. It is then compressed during compression stroke and at the end of compression stroke it is ignited
with the help of spark plug which causes it to expand and produced force which push the piston down and move
the engine.
Every good carburetor should have all above quality. The one of the difficult task which carburetor has to perform
is to mix air and petrol in proper ratio at every speed. As some time engine move fast and then slow so when
engine is running in slow speed then it does not have any load on it then engine require such type of mixture in
which ratio of petrol should be less but engine on high speed then it have full load then engine require rich mixture
having more petrol ratio. The air and petrol proper ratio is:
1 Mixing

2 Evaporation
3 Atomization
1 Mixing
The carburetor has to vary the supply of fuel, air and petrol to suit different running conditions. To mix up these
in mixture chamber is called mixing.
2 Evaporation
The atomization of air and petrol. It converts into vapors from at certain temperature. This reaction is called
evaporation.
3 Atomization
The term atomization means breaking a liquid into very tiny particles.

Importance of maintenance, diagnosis and Servicing

carburetor fuel system and its components

Objectives: At the end of this lesson you shall be able to
• demonstrate maintenance, diagnosis and Servicing carburetor fuel system and its components.

Importance of maintenance, diagnosis, and servicing Carburetor
1 Fuel Efficiency: Proper maintenance, diagnosis & servicing ensures that the Carburettor provides the correct
air-fuel mixture, thereby maximizing fuel efficiency and reducing fuel consumption.
2 Engine Performance: Regular maintenance, diagnosis & Servicing helps keep the engine running smoothly.
3 Emission Control: A well-maintained Carburettor contributes to reducing harmful emissions, promoting
environmental sustainability.
4 Preventive Maintenance: Regular checks and adjustments prevent potential issues from turning into major
problems, helping to avoid the risk of breakdowns and costly repairs.

5 Engine Longevity: Proper maintenance, Diagnosis & servicing prolongs the life of the engine by keeping it
clean and free from damage caused by improper fuel mixture.
6 Cost Savings: Maintenance & Servicing helps avoid costly repairs, saving money in the long run.
7 Safety: Enhances maintenance, diagnosis and servicing safety, preventing engine malfunction that could lead
to accidents or breakdowns.
9 Reliability: Regular maintenance & Servicing increases the reliability of the vehicle and reduces the chances
of breakdown.
10 Customer Satisfaction: Solving Carburettor problems and providing a high performing vehicle increases
customer satisfaction.

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CITS : Automotive - Mechanic Diesel - Lesson 29 & 30