Machinery & Truck PartsBrowse current used CAT and Caterpillar diesel engines for sale with clear pricing, tested inventory, warranty coverage, and nationwide shipping.
Live Used Engine Inventory
Used Cat Engines for Sale
Shop 83 tested used Cat engines in stock.
Our used Cat engines for sale include medium-duty inline-six engines, earlier electronic truck engines, and mechanical V8 inventory. Current identified models include the Cat C7, 3126, 3116, 3176, and 3208. These engines were used across medium-duty and medium-heavy trucks, buses, motorhomes, vocational equipment, marine applications, and industrial or construction equipment depending on the family. The 3116 led into the 3126, the C7 followed the 3126 in the later electronic and ACERT era, the 3176 served heavier Class 7–8 applications, and the 3208 is a mechanical V8 available in naturally aspirated and turbocharged forms. Each model needs to be matched to its original vehicle or equipment configuration.
Cat model names do not make different generations interchangeable. The 3116 may use mechanical or HEUI fuel equipment depending on year. The 3126 and C7 are both 7.2-liter inline-six engines, but their controls, emissions generation, external components, and application details can differ. The 3176 is a larger 10.3-liter electronic inline-six, while the 3208 is a 10.4-liter mechanical V8. Buyers should compare the serial number, arrangement number when available, horsepower rating, fuel system, ECM, turbocharger, flywheel housing, oil pan, mounts, cooling package, and included accessories. The model hubs below organize actual in-stock units and link each engine by year and stock number.
A good used Cat engine can be a cost-effective replacement for a truck, bus, RV, vessel, or machine that is otherwise worth keeping in service. Machinery & Truck Parts inspects and tests used engines before shipping and includes warranty coverage. Our Rockwood, Tennessee team works with the physical inventory and can discuss the exact engine identified by its listing stock number. We ship nationwide, with freight quoted to the delivery ZIP code. Photos and visible listing details help buyers compare the engine with the unit being replaced before committing to an order.
To confirm fitment, have the vehicle or equipment year, make, model, application, engine serial number or arrangement information, and the stock number ready. Marine and equipment applications can use different ratings and external hardware than road vehicles, even within the same Cat family, so do not select an engine by displacement alone. Compare the listing photographs, visible accessories, and model details with the engine being removed before arranging shipment. Review the model guide, choose an in-stock listing, and call (800) 696-5459. The parts team can review current availability, included components, warranty terms, and nationwide freight requirements for the destination.
CAT Engine Inventory
Used CAT and Caterpillar Diesel Engines Ready to Work
Machinery & Truck Parts carries a broad selection of used CAT engines for sale for buyers who need dependable power without the expense or lead time of a new replacement. Current inventory includes Caterpillar 3116, 3126, 3176, 3208 and 3208N engines, along with later CAT C7 and C7S models. Because engines arrive and sell regularly, the listings above provide the most accurate view of available models, years, pricing, and configurations.
These Caterpillar truck engines are commonly used in school buses, delivery and box trucks, vocational vehicles, recreational vehicles, and motor coaches. Depending on the original setup, a used CAT diesel engine may also fit agricultural machinery, generators, or other industrial equipment. Correct fitment can depend on serial number, horsepower, electronics, accessories, oil-pan configuration, and application, so our team helps buyers compare those details before an engine ships.
Every used Caterpillar engine we sell is tested and inspected at our Rockwood, Tennessee facility. Warranty coverage is included, with terms available for the individual engine you are considering. We also arrange nationwide freight shipping for repair shops, fleets, equipment owners, and individual buyers throughout the United States. Call with your delivery location for a freight quote and with your engine serial number when you need help confirming compatibility.
Buying used can keep a proven truck, bus, RV, or machine working for substantially less than purchasing a new engine or replacing the entire vehicle. It can also shorten costly downtime when new assemblies are unavailable or delayed. Our listings include photos, model details, visible pricing, and direct support from a team with more than 30 years of diesel experience. Browse the CAT diesel engines for sale above, then call (800) 696-5459 to discuss a 3116, 3126, 3176, 3208, C7, or C7S.
Model Guides
Popular Cat Engine Models
Used Cat C7 engines · Used Cat 3126 engines · Used Cat 3116 engines · Used Cat 3208 engines · Used Cat 3176 engines
Buying Information
Frequently Asked Questions
Are your used Cat engines tested before shipping?
Yes. Used engines are inspected and tested before shipping, warranty coverage is included, and our team works from a real shop in Rockwood, Tennessee. Call to review the specific engine and warranty terms.
Which Cat engine models do you stock?
Current identified inventory includes C7, 3126, 3116, 3208, 3176. Availability changes as engines sell, so review the live listings and call (800) 696-5459 to confirm the current stock.
Do you ship Cat engines nationwide?
Yes. Nationwide freight shipping is available. The quote depends on the engine and destination, so call with the stock number and delivery ZIP code.
How do I confirm a Cat engine fits my truck?
Have the truck year, make, model, application, engine serial information when available, and the listing stock number ready. Call (800) 696-5459 so the parts team can compare fitment.
Do you sell used Cat engine parts too?
Yes. Browse used Cat engine parts for sale, or call with the engine model, serial information, and part needed.