Spark Plug Diagram - Anatomy and Function Explained #32267 (License: Personal Use)

This schematic illustrates a standard automotive spark plug, featuring a hexagonal nut for installation, a ceramic insulator for electrical isolation, a central electrode, and a grounded side electrode forming the spark gap. The threaded metal shell secures the plug into the engine cylinder head, while the terminal cap connects to the ignition coil. Precision engineering ensures reliable high-voltage discharge under extreme heat and pressure.

Used on automotive repair guides, OEM parts pages, educational content about internal combustion engines, and DIY maintenance tutorials; matches user intent for identifying parts, troubleshooting misfires, or selecting replacements.