Cummins Lower Rocker Cover Gasket for Dodge/Ram (2003-24) 5.9L & 6.7L Cummins

This lower rocker cover gasket is designed for 2003–2024 Dodge and Ram trucks equipped with 5.9L and 6.7L Cummins diesel engines. It seals the rocker housing (also called the lower valve cover or rocker box) to the cylinder head, an area that is frequently disturbed during injector replacement, valve adjustments, and other top-end work on these engines.

Over time, the original gasket can harden or compress, leading to oil seepage along the rocker housing rails and down the side of the engine. Installing a new, OE-style lower rocker cover gasket when the housing is removed helps restore a proper seal and keeps engine oil contained, which is important for daily driven work trucks and heavy towing rigs that see extended high-temperature operation.

The gasket is built from durable, heat- and oil-resistant material and is manufactured to factory dimensions so it fits correctly with OEM heads and rocker housings. Clean mating surfaces and proper torque on the housing fasteners are critical to ensure long-term leak-free performance, especially on higher-mileage Cummins platforms where minor oil leaks can quickly coat wiring, hoses, and chassis components.

This part cross-references several popular numbers—including 131692, 3955109, 3963379, 5114418AA, CUM3963379, CUM1013, 15964, ELR15964, 71-11226-00, VS50589R, VS50419, and X90150-01—making it easy to match with existing catalog listings or OEM service information. Verifying these interchange numbers against the truck’s year, engine, and VIN is a good practice when stocking or ordering parts.

Whenever injectors are serviced, valve lash is set, or the rocker assembly is removed for diagnostic work, replacing the lower rocker cover gasket is inexpensive insurance. Doing so helps reduce future leaks, keeps the engine bay cleaner, and supports long-term reliability for Ram 5.9L and 6.7L Cummins trucks kept in service for the long haul.