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.

Can I use an oversize piston instead of a standard-size piston?

An oversize piston should only be selected when the engine's cylinder bore has been measured and prepared for the corresponding size according to the manufacturer's specifications. It is not a direct substitute for a standard-size piston. Before ordering, confirm the required bore diameter, piston clearance, and machining requirements with your engine technician or service documentation.

What should I check when my replacement piston arrives?

Before installation, compare the new piston with your original component and the engine's specifications. Check the part number, piston diameter, pin dimensions, crown design, and any relevant identification markings. Also confirm that the package contains the components specified in the listing. If you notice an unexpected difference, contact us before installing the piston.

What should I do if my engine still has problems after replacing the pistons?

If the engine continues to show symptoms such as abnormal noise, excessive oil consumption, or poor compression, the cause may involve other components or incorrect assembly clearances. Have a qualified technician inspect the cylinder bores, piston rings, connecting rods, and related engine components using the manufacturer's diagnostic and service procedures. Replacing pistons alone may not resolve every engine problem.

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