Accurately clean spark plugs to restore optimal function.
Adjust spark plug gaps precisely according to specific manufacturer's recommendations for various vehicle models.
Replace spark plugs correctly, adhering strictly to the vehicle's firing order to ensure smooth engine operation.
Lesson summary
This topic introduces students to the critical role of spark plugs in the ignition system of internal combustion engines. Understanding spark plugs, their maintenance, and proper installation is fundamental for automotive technicians, directly impacting engine performance, fuel efficiency, and emission control. In the Nigerian context, this knowledge is invaluable for aspiring mechanics, vehicle owners, and those seeking entrepreneurial opportunities in auto repair and maintenance, where basic engine tuning and servicing are highly demanded skills. Regular spark plug checks and correct installation contribute significantly to the longevity and optimal functioning of vehicles commonly found...
Teacher activity
Begin by asking students about their experiences with vehicle maintenance or common engine problems (e.g., "Why does a car sometimes 'shake' when running?" or "Why does a car consume too much fuel?").
Introduce the ignition system and the specific role of spark plugs in starting and running an engine.
Display various types of spark plugs and relevant tools (spark plug wrench, feeler gauge, wire brush, torque wrench).
State the learning objectives for the lesson.
Evaluation guide
Observation during practical sessions: Teacher observes students' ability to handle tools, follow safety procedures, clean plugs, measure/adjust gaps, and correctly install plugs and leads.
Question and Answer: Oral questions during explanations and demonstrations to gauge comprehension of key concepts and procedures.
Identification Task: Students identify different spark plug conditions from a display of used plugs.
Practical Assessment (Aligned with Evaluation Guide):
Students will be given an engine head or a training engine and a set of used spark plugs and tools.
Reference guide
Spark Plug Wrench/Socket: Specific sizes (e.g., 16mm, 18mm, 21mm) with a rubber insert to protect the ceramic insulator and hold the plug.
Ratchet and Extension Bar: For leverage and reaching recessed plugs.
Feeler Gauge (Wire-Type): Essential for accurately measuring the spark plug gap. Wire-type is preferred over blade-type for spark plugs.
Spark Plug Gapper Tool: Used to adjust the gap (bending the ground electrode).
Wire Brush/Brass Brush: For cleaning carbon deposits from electrodes. *Avoid steel brushes as they can leave conductive particles.*
Compressed Air: For blowing debris out of spark plug wells before removal.
