Lesson Note on Steering Systems—Adjustment of Steering Unit: Remove and Replace Steering Unit for SS2

Class: Senior Secondary School 2 (SS2 / SSS 2)
Term: 2nd Term
Week: 2
Age: 16 years
Duration: 45 minutes
Subject: Auto Mechanic Work
Curriculum Theme: Automotive Systems Maintenance
Previous Lesson: Steering System—Steering Faults, Gearbox, Rack and Pinion, Worm and Wheel, Worm and Nut.
Topic: STEERING SYSTEMS— ADJUSTMENT OF STEERING UNIT
Subject Matter: Meaning of STEERING SYSTEMS— ADJUSTMENT OF STEERING UNIT (definition of steering adjustment), remove and replace steering unit (procedures, safety), adjustment of the steering unit (setting, tightening, alignment)

Specific Objectives

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

Cognitive Domain:

• Define steering adjustment in an automotive context.
• Describe the procedures for removing and replacing a steering unit.
• Explain the steps involved in adjusting a steering unit.

Affective Domain:

• Appreciate the importance of correct steering adjustment for vehicle safety.
• Develop an interest in the practical aspects of auto mechanic work.

Psychomotor Domain:

• Demonstrate the safe removal and replacement of a steering unit.
• Perform basic adjustments (setting, tightening, alignment) on a steering unit.

Social Domain:

• Collaborate effectively during practical demonstrations and group discussions.
• Communicate clearly when discussing steering system components and procedures.

Reference Materials

The following resources were used in planning this lesson:

• Senior Secondary Schools Education Curriculum
• State Unified Scheme of Work
• Automobile Mechanics by H.C. Odo
• Modern Automotive Technology by James E. Duffy
• https://www.youtube.com/watch?v=example-steering-removal
• https://www.autozone.com/repairinfo/repairguide/repairGuideContent.jsp?pageId=0900c15280068869

Instructional Materials

The teacher will teach this lesson with the aid of:

• Posters showing steering system components.
• Charts illustrating removal and adjustment procedures.
• Assorted spanners, hammers, and screwdrivers.
• A complete or dismantled steering unit for demonstration.

Rationale for the Lesson

Understanding steering systems and their proper adjustment is important for maintaining vehicle control and ensuring safety on the road. This lesson helps pupils grasp the practical skills needed for diagnosing and correcting steering issues, which is a fundamental aspect of auto mechanic work.

Prerequisite/Previous Knowledge

Pupils should have basic knowledge of vehicle components, common hand tools, and general workshop safety procedures.

Lesson Content/Board Summary

STEERING SYSTEMS— ADJUSTMENT OF STEERING UNIT

Meaning of Steering Adjustment

Steering adjustment refers to the process of setting the various components of a vehicle’s steering system to their correct specifications. This ensures the vehicle steers accurately, maintains stability, and prevents premature wear of tires and steering parts.

Procedures for Removing and Replacing a Steering Unit

Removing and replacing a steering unit requires careful steps to ensure safety and proper functionality:

• Preparation: Park the vehicle on a level surface, engage the parking brake, and disconnect the battery.
• Access: Lift the front of the vehicle using a jack and secure it with jack stands. Remove the front wheels if necessary.
• Disconnect Linkages: Loosen and disconnect the tie rod ends from the steering knuckles. Disconnect any power steering hoses or electrical connections.
• Remove Steering Column: Disconnect the steering column from the steering gear box, often by removing a pinch bolt.
• Unmount Unit: Unbolt the steering unit (gear box or rack and pinion) from the vehicle frame or subframe.
• Careful Removal: Carefully lower and remove the steering unit from the vehicle.
• Installation (Reverse Order): Install the new or repaired steering unit by reversing the removal steps. Ensure all bolts are tightened to manufacturer specifications.
• Reconnect Components: Reconnect all linkages, hoses, and electrical connections.
• Fluid Refill/Bleeding: If applicable, refill power steering fluid and bleed the system according to manufacturer guidelines.

Safety Considerations during Removal/Replacement:

• Always use appropriate personal protective equipment (PPE) like gloves and safety glasses.
• Ensure the vehicle is securely supported before working underneath it.
• Be cautious of hot engine components and hydraulic fluids.
• Avoid stripping bolts or damaging threads during removal and installation.
• Refer to the vehicle’s service manual for specific torque specifications and procedures.

Procedures for Adjusting the Steering Unit

Adjustment of the steering unit typically involves setting, tightening, and alignment to ensure optimal performance:

• Initial Setting/Centering:
  • Ensure the steering wheel is centered and the front wheels are pointing straight ahead.
  • Adjust the length of tie rods to achieve correct toe-in or toe-out specifications.
• Backlash/Play Adjustment (where applicable, e.g., worm and roller type):
  • Identify the adjustment screw on the steering gear box.
  • Loosen the locknut and carefully turn the adjustment screw to remove excessive play (backlash) in the steering.
  • Avoid over-tightening, as this can cause binding and damage.
  • Tighten the locknut securely once the correct adjustment is achieved.
• Tightening Components:
  • Ensure all bolts and nuts connecting the steering unit to the frame, steering column, and linkages are tightened to the manufacturer’s specified torque.
  • Check for any loose components that could affect steering stability.
• Wheel Alignment:
  • After any major steering component replacement or adjustment, a full wheel alignment is usually required.
  • This involves setting camber, caster, and toe to factory specifications using specialized alignment equipment.

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, reviews the previous lesson briefly, and introduces the new topic: STEERING SYSTEMS— ADJUSTMENT OF STEERING UNIT, highlighting its importance for vehicle safety.
Pupils’ Activity: Pupils respond to greetings, recall the previous lesson, and listen attentively to the introduction of the new topic.
Learning Point: Pupils are prepared for the lesson and understand its relevance.

Step 2: Meaning of Steering Adjustment

Time: 5 minutes
Teaching Skill: Explanation/Definition
Teacher’s Activity: The teacher defines steering adjustment, explaining its purpose in maintaining vehicle control and preventing wear, and writes the definition on the board.
Pupils’ Activity: Pupils listen, take notes, and ask questions for clarification.
Learning Point: Pupils understand the fundamental concept of steering adjustment.

Step 3: Removing and Replacing Steering Unit (Demonstration & Explanation)

Time: 10 minutes
Teaching Skill: Demonstration/Procedural Explanation
Teacher’s Activity: The teacher demonstrates the procedures for removing and replacing a steering unit using the instructional materials (e.g., a dismantled unit or a poster). The teacher explains each step and emphasizes safety considerations.
Pupils’ Activity: Pupils observe the demonstration, ask questions, and take notes on the procedures and safety points.
Learning Point: Pupils learn the practical steps and safety precautions for steering unit removal and replacement.

Step 4: Adjusting the Steering Unit (Demonstration & Explanation)

Time: 10 minutes
Teaching Skill: Demonstration/Procedural Explanation
Teacher’s Activity: The teacher demonstrates and explains the steps involved in adjusting a steering unit, covering initial setting, backlash adjustment (if applicable), tightening, and the need for wheel alignment.
Pupils’ Activity: Pupils observe the demonstration, pay attention to the details of adjustment, and make notes.
Learning Point: Pupils understand how to adjust a steering unit for optimal performance.

Step 5: Safety Measures and Important Notes

Time: 5 minutes
Teaching Skill: Reinforcement/Discussion
Teacher’s Activity: The teacher revisits critical safety measures and provides important notes regarding referring to service manuals and the consequences of improper adjustments. The teacher facilitates a brief Q&A session.
Pupils’ Activity: Pupils ask questions, contribute to the discussion, and confirm their understanding of safety and best practices.
Learning Point: Pupils grasp the importance of safety and accurate procedures in auto mechanic work.

Step 6: 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 steering adjustment?
2. Mention three safety precautions to observe when removing a steering unit.
3. List three main steps involved in adjusting a steering unit.
4. Why is proper steering adjustment important for vehicle safety?

Pupils’ Activity: Pupils answer orally and in writing.

Learning Point: Pupils demonstrate understanding of the lesson.

Step 7: Conclusion

Time: 2 minutes
Teaching Skill: Summarization
Teacher’s Activity: The teacher summarizes the key points of the lesson, reiterating the importance of correct steering system maintenance. The teacher assigns homework, asking pupils to research different types of steering units and their specific adjustment methods.
Pupils’ Activity: Pupils listen to the summary and copy down the assigned homework.
Learning Point: Pupils consolidate their learning and are given tasks to extend their knowledge.

Lesson Keywords

• Steering System – The components that allow a driver to control the direction of a vehicle.
• Adjustment – The process of setting parts to their correct specifications for optimal performance.
• Removal – The act of taking a component out of its installed position.
• Replacement – The act of installing a new or repaired component in place of an old one.
• Alignment – The process of adjusting a vehicle’s suspension to ensure wheels are set to the correct angles.
• Tightening – Securing components by fastening bolts or nuts to a specified torque.

Differentiation

For pupils who grasp concepts quickly, the teacher can encourage them to identify potential problems arising from incorrect steering adjustments. For pupils who need more support, the teacher can provide simplified diagrams, additional one-on-one explanations, and focus on the core definitions and basic procedural steps.

Note for teachers using this lesson plan

Ensure that actual steering unit components are available for a more engaging and practical demonstration. Emphasize safety throughout the lesson, especially when discussing practical procedures. Encourage pupils to ask questions and relate the lesson to real-world vehicle maintenance scenarios.