Used Caterpillar 3126 Diesel Engine for Sale | 7.2L 6-Cylinder Rebuilt for Excavators & Trucks

Are you looking for a reliable used diesel engine for your excavator, truck, or construction equipment? This fully rebuilt Caterpillar 3126 diesel engine delivers proven performance for demanding applications. With a displacement of 7.2 liters and a turbocharged inline 6-cylinder design, this used engine for sale is a trusted power solution for excavators, wheel loaders, trucks, and other heavy equipment. The 3126 is part of Caterpillar’s electronic engine family and is known for its durability, fuel efficiency, and strong performance. It uses the HEUI fuel system, which provides precise fuel delivery and improved cold start capability. We have completely overhauled this used engine for sale to restore its original factory performance. It gives you a cost‑effective way to keep your heavy equipment working.

Applications & Compatibility

• Excavators: Direct fit for Caterpillar 320, 322, 325C; and various mid-size excavator models

• Wheel Loaders: Suitable for Caterpillar 938, 950, 963 series loaders

• Trucks: Delivery trucks, dump trucks, garbage trucks, flatbed trucks, and school buses

• Agricultural Equipment: Challenger farm tractors and ag sprayers

• Industrial Equipment: Lift trucks, cranes, power units, generator sets, compactors, articulated trucks, and backhoes

• Dozers: Caterpillar D6N and D5N medium dozers

Key Features

• Proven Caterpillar Reliability: The 3126 engine features a robust cast iron block and cylinder head. It is designed for continuous heavy-duty operation in demanding construction and industrial environments.

• HEUI Fuel System: The engine uses Caterpillar’s HEUI (Hydraulic Electronic Unit Injector) fuel system. Injection pressure is independent of engine speed, which provides efficient fuel delivery and low emissions. The system uses engine oil to actuate the injectors, delivering precise fuel metering and timing control.

• Turbocharged and Aftercooled: The turbocharger and air‑to‑air aftercooler deliver higher power while keeping rpm steady and exhaust temperatures low.

• Electronic Engine Control: The engine is managed by an Electronic Control Module (ECM) with diagnostic capabilities. This provides precise fuel delivery, improved cold start capability, and lower exhaust emissions.

• Easy Maintenance: The 3126B engine is designed for easy maintenance and can be rebuilt for additional service lives.

• Torque Rise: The direct injection electronic fuel system provides controlled fuel delivery increase as the engine lugs back from rated speed. This results in increased horsepower below rated power, providing greater drawbar pull and faster work cycles.

• Cold Start Capability: The engine features an electronic air inlet heater that warms the air in the intake manifold for easier starting and reduced white smoke on cold starts.

• Fully Rebuilt to OEM Standards: We completely disassemble each engine and rebuild it to original Caterpillar factory specifications. We recondition the cylinder head and inspect the cylinder block. We service the HEUI fuel system and turbocharger. All critical wear parts are replaced with new components.

• Tested Before Shipping: Every unit is hot‑run tested to verify compression, oil pressure, cooling performance, and injection timing. A test report is available upon request.

• Ready to Install: This used engine for sale ships as a complete long‑block assembly with pre‑installed filters and fluids. Necessary mounting hardware and wiring harness are included for straightforward installation.

Why Buy From Us

• 12‑Month Warranty: Coverage for parts and workmanship on all rebuild components

• Worldwide Shipping: Secure export packaging and freight coordination available

• Compatibility Support: Free fitment check with your machine model and serial number

• Core Exchange Available: Ask about returning your old engine core to save on cost

• Documentation Provided: Full rebuild reports and test results upon request