Lesson Note on Suspension System—Repair of Suspension System: Repair of Faulty Side for SS2

Class: Senior Secondary School 2 (SS2 / SSS 2)
Term: 1st Term
Week: 11
Age: 16 years
Duration: 45 minutes
Subject: Auto Mechanic Work
Curriculum Theme: Automobile Chassis Systems
Previous Lesson: Suspension System—Fault Finding in Suspension System: Faulty Areas.
Topic: SUSPENSION SYSTEM—REPAIR OF SUSPENSION SYSTEM
Subject Matter: Definition of Suspension Repair and Practical Steps for Repairing Faulty Suspension Components.

Specific Objectives

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

Cognitive Domain:

• Define suspension system repair.
• Identify common faults in a vehicle’s suspension system.
• State the general steps involved in repairing suspension components.

Affective Domain:

• Appreciate the importance of proper suspension repair for vehicle safety.
• Show interest in practical demonstrations of suspension system repairs.
• Recognize the need for safety precautions during repair work.

Psychomotor Domain:

• Describe the procedure for replacing a damaged suspension part (e.g., a shock absorber).
• Demonstrate the safe use of tools for suspension repair.
• Outline the steps for tightening suspension mountings and aligning components.

Social Domain:

• Collaborate effectively during group discussions on suspension repair challenges.
• Communicate clearly when describing repair procedures.

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.autozone.com/diy/suspension-steering/how-to-replace-shocks-and-struts
• https://www.youtube.com/watch?v=wX1wGf39m6c

Instructional Materials

The teacher will teach this lesson with the aid of:

• Actual coil spring and leaf spring.
• Various hand tools for automotive repair (wrenches, sockets, screwdrivers, jack, jack stands).
• A faulty shock absorber or other damaged suspension component.
• Diagrams or charts illustrating suspension system components and repair procedures.
• A functional vehicle (if available) to demonstrate lifting and component location.

Rationale for the Lesson

Understanding suspension system repair is important because it enables pupils to diagnose and fix common vehicle issues. This knowledge helps ensure vehicle safety and extends the lifespan of the car, which is a valuable skill for future auto mechanics.

Prerequisite/Previous Knowledge

Pupils should have prior knowledge of the components of a vehicle suspension system and their basic functions.

Lesson Content/Board Summary

SUSPENSION SYSTEM—REPAIR OF SUSPENSION SYSTEM

Meaning of Suspension System Repair

Suspension system repair involves identifying and fixing faults within a vehicle’s suspension components. This process aims to restore the vehicle’s handling, ride comfort, and stability by replacing worn or damaged parts, tightening loose connections, and ensuring proper alignment.

Common Faults in a Suspension System

The following are common faults found in a vehicle’s suspension system:

• Worn or leaking shock absorbers/struts.
• Broken or sagging coil/leaf springs.
• Worn or cracked suspension bushings.
• Loose or damaged ball joints and tie rod ends.
• Misaligned wheels.
• Noisy suspension (e.g., clunking, squeaking).
• Uneven tire wear.

General Steps for Repairing a Faulty Suspension Component (Example: Replacing a Shock Absorber)

1. Step 1: Safety Precautions and Preparation. Gather all necessary tools and safety equipment (gloves, safety glasses). Ensure the vehicle is on a flat, stable surface.
2. Step 2: Lifting and Securing the Vehicle. Use a jack to lift the vehicle and place jack stands under the frame to safely support it. Engage the parking brake.
3. Step 3: Removing the Wheel. Loosen the lug nuts, then remove the wheel from the side where the repair is to be performed.
4. Step 4: Disconnecting Suspension Components. Locate the faulty shock absorber. Disconnect any brake lines or ABS sensor wires that might be attached to the shock absorber or strut assembly.
5. Step 5: Removing the Faulty Component. Loosen and remove the mounting bolts that secure the top and bottom of the shock absorber to the vehicle. Carefully remove the old, faulty shock absorber.
6. Step 6: Installing the New Component. Position the new shock absorber in place. Secure the top and bottom mounting bolts, hand-tightening them initially.
7. Step 7: Reassembling and Lowering the Vehicle. Reattach any disconnected brake lines or sensor wires. Mount the wheel back onto the hub and hand-tighten the lug nuts. Carefully lower the vehicle off the jack stands.
8. Step 8: Final Checks and Testing. Torque the lug nuts to the manufacturer’s specifications. Test drive the vehicle to ensure proper function and check for any unusual noises or handling issues.

Teaching Methods/Instructional Techniques

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

Instructional Procedures

Step 1: Introduction

Time: 5 minutes
Teaching Skill: Set Induction
Teacher’s Activity: The teacher greets the pupils and asks them to recall the components and functions of a vehicle’s suspension system from the previous lesson.
Pupils’ Activity: Pupils respond by mentioning components like springs, shock absorbers, and stating their functions.
Learning Point: Pupils recall prior knowledge and are prepared for the new topic.

Step 2: Meaning of Suspension System Repair

Time: 7 minutes
Teaching Skill: Explanation
Teacher’s Activity: The teacher defines what suspension system repair means, emphasizing it involves fixing faults to restore vehicle performance.
Pupils’ Activity: Pupils listen attentively and take notes on the definition.
Learning Point: Pupils understand the core concept of suspension repair.

Step 3: Identification of Common Suspension Faults

Time: 7 minutes
Teaching Skill: Illustration/Discussion
Teacher’s Activity: The teacher uses diagrams and actual faulty components (if available) to explain common suspension system faults such as worn shock absorbers, broken springs, and loose bushings.
Pupils’ Activity: Pupils observe the illustrations, examine the faulty parts, and ask questions for clarification.
Learning Point: Pupils can identify various common faults in a suspension system.

Step 4: Demonstration of Suspension Repair (Part 1 – Preparation & Disassembly)

Time: 8 minutes
Teaching Skill: Demonstration
Teacher’s Activity: The teacher demonstrates the initial steps of a suspension repair, such as safely lifting and securing a vehicle, and beginning the disassembly of a faulty component (e.g., removing a wheel and disconnecting parts around a shock absorber).
Pupils’ Activity: Pupils carefully observe the teacher’s demonstration, paying attention to safety procedures and tool usage.
Learning Point: Pupils learn the practical initial steps for suspension repair.

Step 5: Demonstration of Suspension Repair (Part 2 – Replacement & Reassembly)

Time: 8 minutes
Teaching Skill: Demonstration
Teacher’s Activity: The teacher continues the demonstration by showing how to remove the faulty component, install a new one, and reassemble the parts, including tightening bolts.
Pupils’ Activity: Pupils continue to observe the steps, noting the proper sequence and techniques for replacement and reassembly.
Learning Point: Pupils understand the practical steps for replacing and reassembling suspension components.

Step 6: Discussion on Safety and Tools

Time: 5 minutes
Teaching Skill: Question and Answer
Teacher’s Activity: The teacher leads a discussion on the importance of safety precautions during suspension repair and the correct use of various tools demonstrated.
Pupils’ Activity: Pupils contribute to the discussion, asking questions about safety measures and tool handling.
Learning Point: Pupils recognize the importance of safety and proper tool usage in auto mechanic work.

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 meant by suspension system repair?
2. Mention three common faults that can occur in a vehicle’s suspension system.
3. List any three steps involved in replacing a faulty shock absorber.
4. Why is it important to take safety precautions when repairing a suspension system?

Pupils’ Activity: Pupils answer orally and in writing.

Learning Point: Pupils demonstrate understanding of the lesson.

Step 8: Conclusion

Time: 2 minutes
Teacher’s Activity: The teacher summarizes the key learning points about suspension system repair and encourages pupils to practice identifying faults and understanding repair procedures.
Pupils’ Activity: Pupils listen to the summary and prepare for the next lesson.
Learning Point: Pupils consolidate their understanding of the lesson.

Lesson Keywords

• Suspension system – The system of tires, tire air, springs, shock absorbers and linkages that connects a vehicle to its wheels and allows relative motion between the two.
• Shock absorber – A hydraulic device designed to dampen spring oscillations and absorb bumps.
• Coil spring – A type of spring made from a coil of metal wire, commonly used in suspension systems.
• Leaf spring – A simple form of spring commonly used for the suspension in wheeled vehicles, made of several layers of metal strips.
• Bushing – A type of vibration isolator that provides cushioning between two parts, typically made of rubber or polyurethane.
• Ball joint – A spherical bearing that connects the control arms to the steering knuckles, allowing for movement in multiple directions.
• Alignment – The adjustment of a vehicle’s suspension system to ensure wheels are set to the recommended angle.
• Repair – The process of restoring something damaged, faulty, or worn to a good condition.

Differentiation

For struggling learners, the teacher will provide simplified diagrams and allow more time for hands-on exploration of components. They will also be paired with more advanced learners during practical discussions. For advanced learners, the teacher will challenge them to research specific advanced suspension technologies (e.g., active suspension) or troubleshoot more complex suspension issues.

Note for teachers using this lesson plan

Teachers should prioritize safety during any practical demonstrations. Ensure all tools are in good working condition and that pupils understand the risks involved. If a real vehicle is not available, detailed diagrams, videos, or virtual simulations can be used effectively to illustrate the repair process. Encourage pupils to ask questions and participate actively in discussions. Emphasize that practical skills are as important as theoretical knowledge in auto mechanic work.