Page 100 - Mechanic Diesel - TT

MECHANIC DIESEL - CITS

Preventing damage: Regular servicing helps identify and address issues like clogged filters, leaks, or damaged
components before they lead to more significant engine damage or costly repairs.
Long lifespan: By preventing damage and ensuring proper engine operation, servicing the air intake system
promotes the longevity and reliability of the engine and related components, potentially extending the vehicle’s
lifespan.
Safety: Maintaining the air intake system is essential for safe vehicle operation, as it ensures proper engine
function and performance, reducing the risk of breakdowns or accidents caused by engine issues.

Causes of failure of the components of intake system

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

• explain Causes of failure of the components of intake system.

The intake system of an engine can fail due to following reasons
• Air leak: any leak of an intake system can effect on air-fuel mixture or an engine performance.
• Clogged air filter: a clogged or dirty air filter, it restricts airflow and effects on engine performance.

• Throttle body issues: malfunctioning throttle bodies can disrupt the air intake, affecting engine performance.
• Vacuum leak: leak in intake manifold gasket or vacuum hoses can cause air enter the engine without passing
throttle body it is effect on air-fuel mixture or engine performance.

• Mass air flow sensor (MAF): its failure can lead to incorrect fuel-air mixture ratio because it measures the
amount of air enter the engine.
• Dirty intake manifold: carbon built in the intake manifold and it resists the airflow and disrupts the engine
performance.
• Faulty PCV valve: Positive crankcase ventilation (PCV) valve can to oil containment in the intake system,
affecting engine performance.
• Worn or Damaged component: over time, components can wear out or damaged, leading to leaks and
inefficiencies like intake hoses, seals, or gasket etc.
• Water ingestion: driving into deep water can cause water to enter the intake system, potentially causing
hydro-locking and serve engine damage.
• Incorrect installation: improper installation can lead to lead to leaks or other issues, impacting engine
performance and reliability.

Trouble shooting in an intake system. Study about exhaust

system components such as exhaust manifold, muffler,

types of catalytic converter etc

Objectives: At the end of this lesson you shall be able to
• demonstrate Trouble shooting in an intake system
• study about exhaust system components such as exhaust manifold & muffler
• explain types of catalytic converter.

Troubleshooting in an intake system

Check for air leaks: Check the air intake system for air leaks, such as: B. Broken hoses, loose connections, or
damaged seals. Air leaks can cause incorrect air-fuel ratios and affect engine performance.

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CITS : Automotive - Mechanic Diesel - Lesson 25 - 28 CITS : Automotive - Mechanic Diesel - Lesson 25 - 28