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We recommend starting with your engine's complete model, engine serial number (ESN), and original piston part number. Depending on the engine, its Control Parts List (CPL) may also help identify the correct configuration. Compare these details with our Cummins replacement piston listings and the applicable Cummins parts information. Pistons for engines in the same family are not necessarily interchangeable.

Contents depend on the product. Some Cummins replacement piston listings are for individual pistons, while others offer four-piece or six-piece sets. Certain products specify piston pins and retaining clips, but piston rings and other components should not be assumed to be included. Check the exact product description, quantity options, and included-parts information before ordering.

The correct size depends on the engine's cylinder dimensions and the repair being performed. If the cylinder bores have been machined, the required piston size must be determined from the finished bore measurements and the engine manufacturer's specifications. Do not select an oversize piston based only on the engine model or the amount of visible wear.

You can narrow down the options using the complete engine model, ESN, and any available CPL information. If the engine has been rebuilt previously, details about earlier machining or replacement pistons may also be important. Use the applicable engine parts documentation to confirm the correct piston reference and specifications before ordering.

Before installation, verify the received piston's part number, quantity, dimensions, and configuration against your engine's repair requirements. Inspect the cylinder bores and related components according to the applicable service instructions. Confirm any required piston-to-bore clearance, ring specifications, and installation orientation using the correct engine service documentation rather than assuming universal values.