Lesson Note on Air Cleaner—Importance of Servicing Air Cleaners: Remove and Replace for SS2

Class: Senior Secondary School 2 (SS2 / SSS 2)
Term: 2nd Term
Week: 10
Age: 16 years
Duration: 45 minutes
Subject: Auto Mechanic Work
Curriculum Theme: Nil
Previous Lesson: Air Cleaner, Functions of Air Cleaner, Servicing of Air Cleaner.
Topic: AIR CLEANER— IMPORTANCE OF SERVICING AIR CLEANERS.
Subject Matter: Meaning of AIR CLEANER— IMPORTANCE OF SERVICING AIR CLEANERS (definition of servicing importance), importance of servicing air cleaners (engine performance, fuel economy), remove and replace air cleaners (procedure)

Specific Objectives

By the end of the lesson, pupils should be able to:

Cognitive Domain:

• Define an air cleaner.
• State the importance of servicing air cleaners.

Affective Domain:

• Appreciate the need for regular air cleaner servicing.
• Value safety precautions during mechanical work.

Psychomotor Domain:

• Demonstrate the correct procedure for removing an air cleaner.
• Demonstrate the correct procedure for replacing an air cleaner.

Social Domain:

• Work cooperatively with peers during practical sessions.
• Adhere to workshop safety rules.

Reference Materials

The following resources were used in planning this lesson:

• Senior Secondary Schools Education Curriculum
• State Unified Scheme of Work
• Auto Mechanic Work for Senior Secondary Schools, Book 2
• https://www.youtube.com/watch?v=examplelink1
• https://www.autozone.com/repairinfo/repairguide/repairGuideContent.jsp?pageId=0900c15280053965

Instructional Materials

The teacher will teach this lesson with the aid of:

• A complete air cleaner assembly
• Spanners
• Screwdrivers
• Safety gloves

Rationale for the Lesson

This lesson helps pupils understand the function of an air cleaner and why its regular servicing is important for maintaining engine performance and fuel efficiency. It also provides practical skills in removing and replacing air cleaners, which is a fundamental aspect of vehicle maintenance.

Prerequisite/Previous Knowledge

Pupils have basic knowledge of internal combustion engine components and the need for vehicle maintenance.

Lesson Content/Board Summary

AIR CLEANER AND ITS SERVICING

Meaning of Air Cleaner

An air cleaner, also known as an air filter, is a device consisting of a fibrous material which removes solid particulates such as dust, pollen, mould, and bacteria from the air. It is located in the air intake system of an engine to prevent abrasive particulate matter from entering the engine’s cylinders, where it could cause mechanical wear and oil contamination.

Importance of Servicing Air Cleaners

Servicing an air cleaner involves inspecting, cleaning, or replacing the filter element as needed. This is important for several reasons:

• Maintains Engine Performance: A clean air filter ensures a steady flow of clean air to the engine, which is essential for proper combustion and optimal power output.
• Improves Fuel Economy: A clogged air filter restricts airflow, forcing the engine to work harder and consume more fuel. Regular servicing helps maintain fuel efficiency.
• Extends Engine Life: By preventing dirt and debris from entering the engine, a clean air filter reduces wear on internal engine components, thereby prolonging the engine’s lifespan.
• Reduces Emissions: Efficient combustion, facilitated by clean air, results in lower harmful exhaust emissions.
• Prevents Costly Repairs: Neglecting air cleaner servicing can lead to more serious engine problems and expensive repairs in the long run.

Procedure for Removing and Replacing Air Cleaners

Follow these steps carefully:

• Step 1: Locate the Air Cleaner Housing: Identify the air cleaner housing, usually a large plastic or metal box connected to the engine’s intake manifold.
• Step 2: Disconnect Hoses and Wires: Carefully disconnect any hoses, clips, or electrical connectors attached to the air cleaner housing.
• Step 3: Open the Housing: Use appropriate tools (spanners or screwdrivers) to unfasten the clips, screws, or bolts holding the air cleaner housing cover in place.
• Step 4: Remove the Old Filter Element: Lift out the dirty air filter element from its housing. Note its orientation for correct installation of the new filter.
• Step 5: Clean the Housing: Wipe the inside of the air cleaner housing with a clean cloth to remove any accumulated dust or debris.
• Step 6: Install the New Filter Element: Insert the new air filter element into the housing, ensuring it sits correctly and matches the orientation of the old filter.
• Step 7: Close the Housing: Securely fasten the air cleaner housing cover using the clips, screws, or bolts. Ensure it is tightly sealed to prevent unfiltered air from entering.
• Step 8: Reconnect Hoses and Wires: Reattach all disconnected hoses, clips, and electrical connectors. Double-check that all connections are secure.

Teaching Methods/Instructional Techniques

Discussion, Lecture, Demonstration, Question and Answer, Visual Aids

Instructional Procedures

Step 1: Introduction

Time: 5 minutes
Teaching Skill: Set Induction
Teacher’s Activity: The teacher greets the pupils, takes attendance, and reminds them of the importance of vehicle maintenance. The teacher then introduces the topic: “Air Cleaner and the Importance of its Servicing.”
Pupils’ Activity: Pupils respond to greetings, ensure their attendance is marked, and listen attentively to the introduction.
Learning Point: Pupils are introduced to the topic and its relevance.

Step 2: Meaning of Air Cleaner

Time: 7 minutes
Teaching Skill: Explanation/Definition
Teacher’s Activity: The teacher defines an air cleaner, explaining its function and location in an engine using the provided instructional material (complete air cleaner assembly).
Pupils’ Activity: Pupils listen, observe the air cleaner assembly, and ask questions for clarification.
Learning Point: Pupils understand what an air cleaner is and its basic function.

Step 3: Importance of Servicing Air Cleaners

Time: 8 minutes
Teaching Skill: Explanation/Discussion
Teacher’s Activity: The teacher explains the various reasons why regular servicing of air cleaners is important, such as maintaining engine performance, improving fuel economy, and extending engine life.
Pupils’ Activity: Pupils listen, take notes, and contribute to the discussion by sharing their understanding or experiences.
Learning Point: Pupils learn the benefits of regular air cleaner servicing.

Step 4: Demonstration (Removal Procedure)

Time: 8 minutes
Teaching Skill: Demonstration
Teacher’s Activity: The teacher demonstrates the step-by-step procedure for safely removing an air cleaner element from its housing using the complete air cleaner assembly and tools. The teacher emphasizes safety precautions.
Pupils’ Activity: Pupils observe the demonstration carefully, paying attention to the tools used and the sequence of steps.
Learning Point: Pupils observe the correct procedure for air cleaner removal.

Step 5: Demonstration (Replacement Procedure)

Time: 7 minutes
Teaching Skill: Demonstration
Teacher’s Activity: The teacher continues the demonstration by showing how to correctly install a new air cleaner element and reassemble the housing, ensuring all connections are secure.
Pupils’ Activity: Pupils continue to observe the demonstration, noting how to properly replace the air cleaner.
Learning Point: Pupils observe the correct procedure for air cleaner replacement.

Step 6: Practical Activity

Time: 5 minutes
Teaching Skill: Practical Application
Teacher’s Activity: The teacher guides pupils, in groups or individually, to practice removing and replacing the air cleaner assembly under supervision, correcting any errors.
Pupils’ Activity: Pupils actively participate in the practical exercise, practicing the removal and replacement of the air cleaner.
Learning Point: Pupils gain hands-on experience in servicing an air cleaner.

Step 7: Evaluation/Review

Time: 5 minutes

Teaching Skill: Questioning/Assessment

Teacher’s Activity: The teacher evaluates the learning by asking the following questions:

1. What is an air cleaner?
2. State three reasons why servicing an air cleaner is important.
3. List two tools needed to remove an air cleaner.
4. Briefly describe two steps involved in removing an air cleaner.

Pupils’ Activity: Pupils answer orally and in writing.

Learning Point: Pupils demonstrate understanding of the lesson.

Step 8: Conclusion

Time: 2 minutes
Teaching Skill: Summarization
Teacher’s Activity: The teacher summarizes the key points of the lesson, reiterating the importance of regular air cleaner servicing for vehicle health. The teacher assigns homework for pupils to research different types of air filters.
Pupils’ Activity: Pupils listen to the summary and copy down the homework assignment.
Learning Point: Pupils consolidate their learning and are given a task for further study.

Lesson Keywords

• Air cleaner – A device that filters dust and debris from the air entering an engine.
• Servicing – The act of inspecting, cleaning, or replacing a component to maintain its function.
• Engine performance – The efficiency and power output of an engine.
• Fuel economy – The rate at which a vehicle consumes fuel.
• Filter element – The porous material inside an air cleaner that traps contaminants.

Differentiation

For visual learners, the teacher will use the physical air cleaner assembly and demonstrate procedures clearly. Kinesthetic learners will benefit from the hands-on practical activity of removing and replacing the air cleaner. Auditory learners will benefit from the detailed explanations and discussions. The teacher will provide extra guidance and simplified instructions for pupils who may struggle with the practical steps.

Note for teachers using this lesson plan

Emphasize workshop safety throughout the practical demonstration and activity. Ensure pupils wear appropriate safety gear if available. Provide enough tools and air cleaner assemblies for practical work to allow active participation. Encourage pupils to ask questions and discuss their observations during the practical session. Monitor pupils closely during the practical activity to prevent damage to components or injury.