268467 - Miller Spark Plug for Kohler CH440 Engine

Technical Overview of the Miller 268467 Spark Plug

The Miller 268467 Spark Plug is a critical component designed specifically for the ignition system of Kohler CH440 engines found in various Miller engine-driven welding generators. As an Original Equipment Manufacturer (OEM) part, this spark plug is engineered to meet the exact thermal and electrical specifications required by the Kohler Command PRO series. Utilizing the correct spark plug is paramount for maintaining the combustion efficiency of the engine, ensuring that the fuel-air mixture is ignited at the precise moment for optimal power output and fuel economy.

This spark plug features a high-grade ceramic insulator that provides superior dielectric strength, preventing voltage leakage even under the high-temperature conditions typical of prolonged welding operations. The central electrode is designed to resist erosion, maintaining a consistent spark gap over the service life of the component. The metal shell is treated to resist corrosion, a necessary feature for equipment that is frequently exposed to outdoor elements and job site humidity. By adhering to the manufacturer's heat range specifications, the Miller 268467 prevents issues such as pre-ignition (running too hot) or carbon fouling (running too cold), which can severely impact engine reliability.

Maintenance professionals understand that the spark plug is often the first line of defense against poor engine performance. A worn or fouled plug can lead to incomplete combustion, increased exhaust emissions, and difficulty starting the machine. Replacing the spark plug at the recommended service intervals—typically every 100 to 300 hours of operation depending on the specific maintenance schedule of the welder—ensures that the engine remains reliable. This specific SKU guarantees compatibility with the cylinder head geometry and thread pitch of the CH440, eliminating the risks associated with universal or cross-referenced parts that may not align perfectly with the combustion chamber design.