Piston

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About Piston

Engine Pistons and Piston Kits for Heavy Equipment

Find replacement pistons and piston kits for selected diesel engines used in excavators, loaders, tractors, and other machinery at FAB Heavy Parts. The collection includes individual pistons, piston kits, and assemblies supplied with components such as piston pins and retaining clips, depending on the product listing.

An engine piston moves within the cylinder bore, transferring combustion force through the connecting rod to the crankshaft. Because piston dimensions and design vary by engine, choosing the correct replacement is essential when repairing an engine or completing an overhaul.

Replacement Pistons for Multiple Engine Brands

Browse piston listings for selected Caterpillar, Cummins, Deutz, Isuzu, Hino, John Deere, Komatsu, Kubota, Perkins, Yanmar, and other engines. Examples include Caterpillar piston assemblies 419-0379 / 361-2486 for listed C4.4 and C6.6 applications, Cummins piston set 3917707 for the 6CT 8.3L 12-valve engine, and Yanmar piston kit 119515-22080 / 119515-22500 for listed 3TNV70 and 3YM20 applications. 

Product options vary. Some listings cover a single piston, while others specify multi-piece sets with pins and clips. Selected products also identify oversize dimensions, which are intended for particular engine repair requirements rather than being interchangeable with standard-size pistons.

Choose the Correct Piston for Your Engine

Before ordering, compare the engine model, original part number, piston size, and listed application. If an engine has been rebored, verify the required piston size against the machine shop's measurements and the engine manufacturer's specifications. Do not assume that pistons for engines in the same family share the same dimensions or design.

Need Help Finding Piston?

Can't find the replacement part you need? Send FAB Heavy Parts your part number, engine model, or equipment details. Our team can help review your requirements and provide a quotation.

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Frequently Asked Questions

How do I find the right piston for my diesel engine?

Start with your engine manufacturer, complete engine model, and original piston part number. If available, also check the engine serial number and the dimensions specified in your service documentation. Compare these details with the replacement piston listing rather than relying on the equipment model alone. If you are unsure which piston matches your engine, send us your engine information and original part number for assistance.

What's the difference between an individual piston and a piston kit?

An individual replacement piston listing may include only the piston, while a piston kit can include additional components such as a piston pin, retaining clips, or piston rings. Some of our listings also offer multi-piece sets for engines with multiple cylinders. Contents vary by product, so please check the listing carefully to confirm what is included before ordering.

What is the difference between a single piston and a piston kit?

A single-piston listing generally refers to one piston, while a piston kit or multi-piece set may include several pistons and, depending on the listing, pins and retaining clips. The word “kit” does not guarantee that piston rings, connecting rods, or other overhaul parts are included. Review the product description for the exact contents.

How do I choose between a standard-size and oversize piston?

The correct size depends on the engine's cylinder bore condition and the repair specifications. An oversize piston may be required after a cylinder is machined to a larger diameter, but the correct oversize must be determined from the engine's service specifications and measured bore. Do not select an oversize piston based on the engine model alone.

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