Cummins Engine Rebuild Kits and Parts Looking for reliable and affordable Cummins engine rebuild kits? Whether you're rebuilding a Cummins ISX15, N14, 6BT, QSB, or another Cummins diesel engine, HeavyDutyKits.com offers in-frame and overhaul kit options designed to help restore engine performance, reliability, and service life. At HeavyDutyKits.com, we supply Cummins engine rebuild kits and replacement parts for heavy-duty truck, industrial, agricultural, construction, marine, and off-highway applications. Fitment can vary by engine configuration, so our team can help verify the correct components using your CPL number and engine serial number (ESN). What's Included in Our Cummins Overhaul Kits? Kit contents vary depending on the Cummins engine model, CPL, application, manufacturer, and rebuild level. In-Frame Rebuild Kits A typical Cummins in-frame rebuild kit may include: Pistons and piston rings Cylinder liners Piston pins and retainers Connecting rod bearings Main bearings Thrust washers In-frame gasket set Depending on the engine and selected package, additional components such as oil seals, camshaft bushings, or valvetrain parts may also be available. Out-of-Frame Overhaul Kits Out-of-frame rebuild packages are designed for more extensive engine teardown and rebuilding. Depending on the application, these kits may include everything supplied in an in-frame kit plus: Camshaft bushings Rear main seal Front crankshaft seal Complete gasket sets Additional seals and hardware Oil pump or water pump options depending on the package Cummins CPL and ESN Fitment Cummins engines can use different pistons, liners, bearings, gasket configurations, and internal components even within the same engine family. Providing your Cummins CPL number and engine serial number helps our parts team identify the correct rebuild kit configuration for your engine. Popular Cummins Engine Models We Support HeavyDutyKits.com supplies rebuild kits and engine parts for many popular Cummins diesel engine families, including: Cummins ISX / ISX15 / QSX: CM570, CM870, CM871, CM2250, CM2350, and related configurations Cummins N14 / M11: Red Top, Celect, Celect Plus, and other applications Cummins B Series: 6BT, 5.9L, 12-valve, 24-valve, industrial, automotive, and marine applications Cummins QSB / B3.3: Construction, agricultural, industrial, and equipment applications Cummins QSK Series: Heavy equipment, mining, industrial, and power-generation applications Cummins 855 / NT / NH: Classic heavy-duty Cummins engine platforms If you're unsure which kit fits your engine, send us your CPL number or ESN and our team can help identify the correct parts. Shop Popular Cummins Rebuild Kit Categories Cummins ISX Rebuild Kits: Shop Cummins ISX Rebuild Kits Cummins N14 Overhaul Kits: Shop Cummins N14 Overhaul Kits Cummins 6BT / 5.9L Parts: Shop Cummins 6BT 5.9L Parts Frequently Asked Questions What's the difference between an in-frame and out-of-frame rebuild kit? An in-frame rebuild kit typically includes pistons, liners, bearings, rings, and gaskets for major engine repairs. An out-of-frame overhaul kit is intended for a more extensive engine rebuild and may include additional seals, bushings, gaskets, and other components required during a complete teardown. How do I find the correct Cummins rebuild kit? The best way to identify the correct kit is by using your engine's CPL number and engine serial number (ESN). These numbers help confirm the correct piston, liner, bearing, gasket, and component configuration. Where can I find my Cummins engine serial number? The Cummins ESN is typically located on the engine dataplate. Its exact location varies by engine family. Providing both the ESN and CPL gives our parts specialists the best information for verifying fitment. Do you offer aftermarket Cummins engine parts? Yes. HeavyDutyKits.com offers parts from established diesel aftermarket manufacturers, including brands such as PAI, Mahle, IPD, Interstate-McBee, and other suppliers depending on the engine and product category. Can I order individual Cummins engine parts instead of a complete rebuild kit? Yes. In addition to complete engine rebuild kits, we offer many individual Cummins engine components, including cylinder heads, pistons, liners, bearings, gasket sets, oil pumps, water pumps, camshafts, turbochargers, fuel-system components, and other related engine parts. Why Buy Cummins Engine Parts From HeavyDutyKits? Diesel Parts Specialists: Get help identifying the correct components for your Cummins engine application. CPL and ESN Fitment Assistance: Our team can help verify engine-specific configurations before you order. Multiple Brand Options: Choose from established aftermarket diesel engine parts manufacturers depending on availability and application. Complete Rebuild Solutions: Shop complete rebuild kits as well as individual engine components. Nationwide Shipping: We ship diesel engine parts throughout the United States. Easy Online Ordering: Browse and order Cummins engine parts directly through HeavyDutyKits.com. Need Help Finding the Right Cummins Rebuild Kit? Send us your Cummins engine serial number (ESN), CPL number, engine model, and the parts you need. Our diesel parts team can help identify the appropriate rebuild kit or individual engine components for your application. Contact HeavyDutyKits for Cummins Engine Parts Assistance