Piston Rings

2010-2018 Dodge Ram 2500 & 3500 6.7L Cummins Heavy-Duty Piston Rings & Cylinder Sealing Components

Maximize combustion sealing efficiency, eliminate performance-robbing blow-by, and protect your lower crankcase from excessive pressurization with premium 2010–2018 6.7L Cummins 4th Gen piston rings from Full Force Diesel. In a high-torque common-rail diesel engine, the piston rings are the ultimate frontline barrier between thousands of pounds of explosive combustion force and your oiling system. Driven by elevated boost pressures and intense thermal loads, weak or worn rings lose their tension, allowing hot exhaust gases to blow past the piston skirt. Upgrading to engineered, heavy-duty aftermarket piston rings ensures an airtight cylinder seal, restoring lost compression, sharpening throttle response, and stabilizing oil consumption.

Advanced Metallurgy: Plasma-Moly Coatings and Extreme Heat Resistance

Aftermarket performance piston rings overcome the structural and environmental limits of the factory layout through superior material composition and surface treatments:

• Plasma-Moly and Ceramic Coatings: The top compression ring takes the direct blast of diesel combustion, frequently enduring temperatures that exceed 1,200 degrees Fahrenheit. Performance top rings are engineered from high-strength ductile iron or steel and treated with advanced plasma-moly or specialized ceramic face coatings. These rugged coatings provide an incredibly low coefficient of friction while delivering exceptional scuff resistance, preventing the rings from micro-welding to the piston lands under high-load towing conditions.

• Martensitic Ductile Iron Second Rings: The secondary scraper ring serves dual roles: managing oil control and acting as a secondary pressure seal. Utilizing high-tensile martensitic ductile iron ensures the ring maintains uniform outward radial tension against the cross-hatched cylinder wall over hundreds of thousands of miles, effectively scraping away oil mist without wearing down the bore prematurely.

Precision Tuning: File-Fit Ring Packs and Custom Bore Diameters

For 4th Gen common-rail owners executing high-horsepower engine overhauls or matching parts with upgraded forced induction setups, standard drop-in ring clearances are rarely optimal:

• Custom File-Fit Piston Ring Sets: When building a high-boost street or competition diesel engine, thermal expansion causes the piston rings to grow significantly in length. If the ring end-gap is too tight from the factory, the ends will physically collide under load, causing the ring to bind, break the piston lands, and score the cylinder wall. Our selection of file-fit ring sets allows your engine builder to precisely measure and file the end-gap down to the exact ten-thousandth of an inch, tailoring the clearance perfectly to your specific boost and power targets.

• Standard and Oversize Availability: Whether you are performing a simple freshen-up hone on a standard 4.213-inch factory bore or clearing out cylinder damage by boring the block over, we stock the exact hardware required. Explore complete multi-cylinder ring networks available in standard dimensions as well as common oversize variations, including plus 0.020-inch and plus 0.040-inch configurations, ensuring a flawless mechanical fit for your rebuild.

At Full Force Diesel, we supply the machine-shop-certified engine internals and heavy-duty restoration components your 4th Gen inline-six needs to remain completely bulletproof. Explore our complete selection of 2010–2018 6.7L Cummins 4th Gen piston rings, high-performance file-fit ring sets, heavy-duty oil control rings, and matching engine build accessories above to secure your engine's cylinder pressure today.