Spark Plug Explained - Anatomy, Function & Replacement Guide #266653 (License: Personal Use)

This high-resolution illustration shows a conventional resistor-type spark plug used in gasoline internal combustion engines. Key features include the nickel-alloy center electrode, grounded side electrode, alumina ceramic insulator for electrical isolation, and a hexagonal metal shell for installation. The design ensures reliable ignition under high pressure and temperature while minimizing electromagnetic interference.

Used on automotive repair guides, OEM parts pages, mechanic training materials, and DIY maintenance blogs; targets users searching for spark plug identification, replacement intervals, or symptoms of failure (e.g., misfires, rough idling).