Title: Identify the components of a spark plug.
Course: Small Engine Repair (20110-36) > Section: Servicing Spark Plugs

Identification should include

- terminal
- ground electrode
- center electrode
- insulator
- thread diameter
- reach
- seat
- hex body
- gasket/tapered seat
- knurled surface shell.

Process/Skill Questions:

- Why are all of these parts necessary for a spark plug to function?
- What is the purpose of a gasket or tapered seat on a spark plug?
- Why is thread diameter important when installing/replacing a spark plug?
- How is a spark plug’s heat range identified?
- What are the differences between a resistor and non-resistor spark plug?