The Cummins barrel and plunger assembly is a key component of the fuel injection system in many Cummins diesel engines. It is responsible for generating the high fuel pressure required for efficient combustion.
The plunger moves up and down inside the barrel, driven mechanically by the camshaft. As it moves, it compresses the fuel within the barrel, forcing it through the injector at the precise pressure and timing needed. The accuracy of this process determines the engine’s performance, fuel efficiency, and emission levels.
Because of the precision required, the barrel and plunger are manufactured with extremely tight tolerances and high-quality materials to resist wear and corrosion under continuous high-pressure conditions.