Lesson Notes By Weeks and Term - Senior Secondary 2

Engine lubrication

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TERM – 2ND TERM

WEEK FIVE

Class: Senior Secondary School 2

Age: 16 years

Duration: 40 minutes of 5 periods each

Date:

Subject: AUTO MECHANICAL

Topic: ENGINE LUBRICATION

SPECIFIC OBJECTIVES: At the end of the lesson, pupils should be able to

I.) Define engine lubrication

II.) Describe viscosity and viscosity index

III.) Identify the functions of lubrication

INSTRUCTIONAL TECHNIQUES: Identification, explanation, questions and answers, demonstration, videos from source

INSTRUCTIONAL MATERIALS: Videos, loud speaker, textbook, pictures,

INSTRUCTIONAL PROCEDURES

PERIOD 1-2

PRESENTATION

TEACHER’S ACTIVITY

STUDENT’S

ACTIVITY

STEP 1

INTRODUCTION

The teacher explains the meaning of lubrication, viscosity and viscosity index

Students listens attentively to the teacher                                                                          

STEP 2

EXPLANATION

Teacher discusses the functions of lubrication

Students exhibit attentiveness and active engagement

STEP 3

NOTE TAKING

The teacher writes a summarized

note on the board

The students

copy the note in

their books

 

NOTE

ENGINE LUBRICATION

Engine lubrication refers to the process of providing a thin layer of oil or lubricant to reduce friction between moving parts within an engine. This lubrication is crucial for ensuring smooth operation, reducing wear and tear on components, and dissipating heat generated during engine operation.

Viscosity

Viscosity is a key property of engine lubricants. It refers to the oil's resistance to flow or its thickness. Oil viscosity is typically measured using two numbers, such as 10W-30, with the first number representing the oil's viscosity at low temperatures (the "W" stands for winter) and the second number representing its viscosity at high temperatures.

The viscosity index (VI) is a measure of how much an oil's viscosity changes with temperature. It indicates the oil's ability to maintain its viscosity over a range of temperatures. Oils with higher viscosity index values exhibit less viscosity change with temperature variations, providing more stable lubrication across a wider range of operating temperatures.

Functions of lubrication

The following are functions of lubrication;

  1. Lubricants reduce friction between moving surfaces by providing a thin film or layer that separates them. This minimizes wear and heat generation, prolonging the lifespan of mechanical components.
  2. Lubricants form a protective barrier between surfaces, preventing direct metal-to-metal contact and reducing wear and tear on components.
  3. Lubricants absorb and dissipate heat generated during mechanical operation, helping to maintain optimal operating temperatures and preventing thermal damage.
  4. Lubricants can protect metal surfaces from corrosion by forming a barrier that seals out moisture and corrosive contaminants.
  5. In some applications, lubricants act as a sealant to prevent leakage of fluids or gases from machinery or components.
  6. Lubricants can help flush away debris and contaminants from mechanical systems, keeping them clean and free of contaminants that could cause damage or malfunction.

EVALUATION: 1. What is engine lubrication ?

  1. Define viscosity
  2. Mention 5 functions of lubrication

CLASSWORK: As in evaluation

CONCLUSION: The teacher commends the students positively