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2021 Cummins Ram 2500–3500 Diesel Engine 6.7L

2021 Cummins 6.7L Diesel Engine

Used Engines Inventory

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Modern Cummins long block for Ram HD

The 2012 Ford Powerstroke 6.7L Diesel Engine is a robust choice for heavy-duty applications, found in the 2012 Ford F250, F350, and F550 models. This turbocharged V8 engine delivers significant torque and horsepower, making it ideal for towing and hauling. Its design ensures both performance and efficiency, with a reputation for reliability and durability. Whether for work or recreation, the 6.7L Powerstroke handles demanding tasks with ease. For more details on its performance and specs, visit our 2012 F250 diesel engine page.

Diesel Engine

Modern Cummins long block for Ram HD

The 2021 Cummins 6.7L engine is built for high torque output, refined idle quality, and cleaner emissions performance, making it the preferred diesel engine for Ram 2500 and 3500 trucks. Houston Engines offers remanufactured and used Cummins long blocks verified for structural integrity, oiling consistency, and compression balance. Cylinder heads are pressure-tested and resurfaced, with OE-spec pistons, rings, and bearings restoring dependable combustion. Whether replacing a worn 2021 Ram long block or repairing a fleet truck, buyers get smooth towing capability, stable performance, and long-term Cummins reliability.

Reman Cummins 6.7L engines undergo complete machining, including torque-plate honing for precise cylinder geometry, polished crankshaft surfaces, balanced rotating assemblies, and refined combustion chamber finishes.

Updated gaskets, new pistons, and reconditioned cylinder heads restore OEM-level fuel efficiency, towing strength, and reliable performance for Ram owners and commercial operators who depend on consistent diesel power every day.

Used Cummins 6.7L engines are compression-tested, leak-down verified, and borescope-inspected to confirm clean cylinder walls and steady ring sealing. Technicians clean oil passages thoroughly, replace external gaskets where needed, and inspect accessories to ensure accuracy before shipment. Both reman and used engines are professionally documented, expertly validated, and supported by Houston Engines, giving diesel owners dependable reliability, reduced downtime, and proven towing capability whether installing a replacement long block, rebuilding a work truck, or preparing a fleet vehicle for demanding service. These rigorous processes ensure lasting value and confidence for every engine buyer today.

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Are you in the market for a used engine to get your vehicle back up and running? Look no further than Houston Engines. We offer a wide selection of high-quality, used engines at affordable prices. We pride ourselves on our commitment to customer satisfaction and provide a hassle-free shopping experience for all our clients.

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Engine Testing Procedures and Warranty Coverage

Each 2021 Cummins 6.7L engine receives compression checks, oil-pressure verification, and leak integrity testing, and when equipment allows, hot-run simulations confirm temperature stability and pressure consistency. All test data is recorded and assigned to each engine’s serial number for transparent traceability.

Remanufactured engines include extended Cummins ISB warranty protection, while used Cummins 6.7L for sale units carry standard coverage. Proper installation, documented service intervals, and break-in compliance maintain warranty eligibility and long-term Cummins reliability.

Break-in steps include priming the oil system, running approved break-in oil, and completing the first service interval promptly.

Replace coolant, belts, and filters during installation to prevent early contamination. Inspect the turbocharger, EGR components, and intercooler for debris left behind from a prior failure, which is critical for protecting the new or used engine from immediate damage.

Fuel and air systems must be sealed and cleaned to maintain smooth idle and prevent temperature imbalance under load. After installation, allow a controlled warm-up cycle and monitor for leaks or uneven operation. These steps protect warranty coverage, ensure proper compression seating, and promote long-term operational stability for Ram 2500 and 2021 Ram 3500 engine owners using their trucks for heavy towing or commercial duty.

Fitment and Compatibility for 2021 Engines

This 2021 Cummins 6.7L engine is designed for Ram 2500 and Ram 3500 trucks equipped with the Cummins ISB. Always verify VIN details, emissions configuration, and calibration requirements before ordering to ensure accurate L6 diesel compatibility.

Houston Engines confirms casting numbers, manifold alignment, and accessory pattern matching before shipment to guarantee correct fitment. Most external components transfer from the original engine, reducing installation delays and simplifying shop labor.

Contact Houston Engines for installation support, torque specifications, 6.7L break-in procedure assistance, and freight scheduling. Our team also provides guidance on Cummins freight handling, warranty activation, and proper return documentation, ensuring a smooth, efficient process for engine installation, maintenance, and replacement, while helping you maintain compliance and maximize long-term engine reliability.

Freight process and core return

Engines ship on reinforced pallets with heavy-duty banding, corner protection, and moisture-resistant packaging. Nationwide delivery options include lift-gate and dock service, reducing handling time and improving safety during transport for both remanufactured and used Cummins 6.7L engines.

Cores must be fully drained and returned using the provided RMA and BOL documents. Reusing the original crate and properly securing the engine during transport helps prevent damage. Timely return ensures full eligibility for core credit and avoids storage-related deductions.

Credits are issued once the core is inspected. Internal damage, missing major components, or contamination can reduce refund value. Reviewing the supplied checklist before shipping helps ensure a smooth return process and preserves the maximum core credit for Houston Engines customers.

Frequently Asked Questions (FAQs)

Frequently Asked Questions (FAQ)

What trucks use the 2021 Cummins 6.7L engine?

It fits 2021 Ram 2500 and 2021 Ram 3500 models equipped with the 6.7L Cummins ISB diesel engine.

Is the 2021 Cummins 6.7L engine reliable?

Yes. It’s known for strong torque output, stable towing power, and long-term Cummins reliability when properly maintained.

Does Houston Engines provide warranty coverage?

Yes. Reman Cummins units include extended warranty options; used engines include limited coverage.

What is included in a reman Cummins 6.7L?

Reman units include new pistons, rings, bearings, gaskets, and fully reconditioned heads.

Are the engines tested before shipping?

Yes. Engines undergo compression, pressure, and leak-down testing with documented results.

How is Cummins freight handled?

Engines ship on secured pallets with nationwide lift-gate or dock delivery options.

What should be replaced during installation?

Replace coolant, filters, belts, and perform oil priming to support proper break-in.

Can original components be reused?

Yes. Most turbos, manifolds, sensors, and brackets transfer directly to the new long block.

How can I extend engine life?

Follow recommended maintenance, monitor oil pressure, and maintain proper cooling system function.

How do I order a 2021 Cummins 6.7L engine?

You can contact us at Houston Engines for pricing, warranty options, and fitment verification.

Why Buy From Us?

We strive to be the ultimate destination for recycled auto parts. With access to a vast inventory and exclusive parts network, we offer millions of quality parts. We specialize in used engines and transmissions with new stock weekly. Our commitment to quality means that you can trust that you're getting the best possible part for your vehicle.