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Description
About the 6.7 Cummins Engine
Looking for a used 6.7 Cummins engine for sale? Look no further than the robust power and reliability of this renowned inline-six turbocharged diesel engine from Cummins Inc. Whether you’re replacing a worn engine in your Ram 2500, 3500, 4500, or 5500 heavy-duty truck, completing a Freightliner Business Class M2 service rebuild, or sourcing a powerplant for a custom diesel swap project, the 6.7 Cummins is the heart of Dodge and Ram heavy-duty diesel pickup performance since mid-year 2007. Built to handle heavy loads, demanding work cycles, and the punishment of commercial duty cycles, this engine is a favorite among diesel truck enthusiasts, fleet managers, and contractors alike.
Engine Overview: Cummins ISB 6.7L
The 6.7L Cummins ISB turbo diesel engine is renowned for its power output, robust construction, and the legendary durability that has made Cummins B-series engines the choice of Dodge / Ram heavy-duty trucks for decades. Compatible with Dodge Ram 2500 and 3500 (2007.5 through current), Ram 4500 and 5500 chassis cab (2008 through current), and Freightliner Business Class M2 medium-duty trucks, these engines deliver impressive performance across multiple generations. With stock power outputs ranging from 350 horsepower / 610 lb-ft (early 2007.5 to 2010 base trucks) to 420 horsepower / 1,075 lb-ft (current High Output variants), a used 6.7 Cummins engine delivers serious heavy-duty diesel capability.
Critical Buyer Information: The 6.7 Cummins Has Four Distinct Generations
Before ordering, it’s essential to understand which generation of the 6.7 Cummins you need. The engine has gone through four distinct generations with significant differences in fuel system, emissions equipment, power output, and reliability characteristics:
Generation 1: 2007.5 to 2012
- Fuel system: Bosch CP3 high-pressure pump (proven reliable design)
- Emissions: DPF + EGR only (NO DEF / SCR system yet)
- Power output: 350 HP / 610 to 800 lb-ft
- Common issues: EGR cooler failures, DPF clogging, CP3 generally reliable
- Years: 2007.5, 2008, 2009, 2010, 2011, 2012 model year Ram 2500 / 3500
Generation 2: 2013 to 2018
- Fuel system: Bosch CP3 high-pressure pump (still reliable)
- Emissions: DPF + EGR + SCR + DEF (Diesel Exhaust Fluid) system added for 2013+
- Power output: 350 to 385 HP / 660 to 865 lb-ft (HO variant available)
- Aisin AS69RC transmission paired with HO 385 HP / 865 lb-ft configuration
- Common issues: DEF system sensor failures, otherwise generally reliable
- Years: 2013, 2014, 2015, 2016, 2017, 2018 model year Ram
Generation 3: 2019 to 2023
- Fuel system: Bosch CP4.2 high-pressure pump (NOTORIOUS catastrophic failure history when exposed to fuel contamination or water in fuel)
- Emissions: DPF + EGR + SCR + DEF
- Power output: 370 to 400 HP / 850 to 1,000 lb-ft (HO variant)
- Common issues: CP4.2 fuel pump catastrophic failures can send metal debris through the entire fuel system requiring complete fuel system replacement; aftermarket CP3 conversion kits popular as preventive measure
- Years: 2019, 2020, 2021, 2022, 2023 model year Ram
Generation 4: 2024 to Current
- Fuel system: Current production system
- Emissions: Current EPA / CARB compliant
- Power output: Up to 420 HP / 1,075 lb-ft (HO variant)
- Years: 2024 plus model year Ram
When ordering, match the generation to your truck. Installing a Generation 3 engine (CP4.2) into a Generation 1 truck (designed for CP3) requires fuel system modifications.
Why Buy the 6.7 Cummins Engine?
- Turbocharged Power: Offers substantial horsepower and torque output across all generations, ideal for towing heavy trailers, hauling commercial loads, and powering chassis cab work trucks.
- Inline-Six Configuration: The classic Cummins B-series I6 configuration provides excellent torque delivery characteristics, smooth power delivery, and the legendary durability that has made Cummins engines the choice of Dodge / Ram heavy-duty trucks for over 30 years (since the original 5.9L 12-valve in 1989).
- Variable Geometry Turbocharger (VGT): Provides precise boost pressure control across the RPM range, enhancing low-end torque for improved acceleration and towing capability while delivering high-RPM power for highway passing.
- High-Pressure Common Rail (HPCR) Fuel Injection: Delivers fuel at extreme pressures (over 30,000 PSI) for optimized combustion efficiency, reduced emissions, and improved fuel economy versus older mechanical injection systems.
- Cast Iron Block and Head: Built for durability under heavy commercial duty cycles. Many 6.7 Cummins engines exceed 500,000 miles in commercial service with proper maintenance.
- Aftermarket Support: Extensive availability of performance parts, tuners, exhaust systems, intake systems, EGR / DPF delete kits (for off-road and competition use), and aftermarket fuel system upgrades.
- Proven Track Record: Backed by Cummins’ reputation for reliability and longevity, with the B-series family having powered Dodge / Ram trucks since 1989 (B5.9 12-valve, B5.9 24-valve, then B6.7).
- Smart Diesel Exhaust Fluid (DEF) System (2013 plus): Optimizes DEF consumption for efficient emissions control without compromising engine power. Note: Generation 1 (2007.5 to 2012) engines do NOT have DEF / SCR systems.
- Exhaust Brake (Optional): Integrated exhaust brake helps manage vehicle speed on steep downhill grades, particularly valuable for towing heavy trailers, enhancing safety and reducing service brake wear.
- Advanced Cooling System: Engineered to handle sustained heavy-duty operation under high ambient temperatures.
6.7 Cummins Engine Vehicle Applications
The Cummins ISB 6.7L is used in:
Primary Applications: Dodge / Ram Heavy-Duty Pickups
- Dodge Ram 2500 (2007.5 to 2010 with Dodge branding, 2011 to current with Ram branding)
- Dodge Ram 3500 (2007.5 to 2010 Dodge, 2011 to current Ram)
- Ram 2500 (2011 to current)
- Ram 3500 (2011 to current, including HO with Aisin AS69RC transmission)
Chassis Cab Applications:
- Ram 4500 Chassis Cab (2008 to current) , medium-duty work truck
- Ram 5500 Chassis Cab (2008 to current) , medium-duty work truck
Commercial Truck Applications:
- Freightliner Business Class M2 (medium-duty commercial truck) , available with 6.7 Cummins ISB
Important Note: NOT Used in Class 8 Heavy-Duty Trucks
Despite some descriptions claiming compatibility with Freightliner Cascadia, Kenworth T680 / T880, and Peterbilt 567 / 579, the Cummins 6.7L ISB is a medium-duty engine. These Class 8 heavy-duty long-haul trucks typically use the larger Cummins ISX15 / X15 (15-liter) engine, not the 6.7L ISB. The 6.7 Cummins is appropriate for:
- Medium-duty trucks (Class 4 to 7)
- Heavy-duty pickup applications (Ram 2500 / 3500)
- Chassis cab work trucks (Ram 4500 / 5500, Freightliner M2)
- Some recreational vehicle applications (motorhomes, RVs)
- Industrial / agricultural equipment
For Class 8 heavy-duty long-haul applications (Cascadia, T680, 579), you need the Cummins ISX15 / X15. Call (240) 301-0095 to inquire about ISX15 availability.
Emissions Compliance
All our used 6.7 Cummins engines for sale are sold with their original factory emissions equipment intact and adhere to EPA regulations. We include the necessary emissions system components (DPF, EGR system, and where applicable SCR / DEF system for 2013 plus engines) to ensure your truck remains compliant with current standards when properly installed.
Why Choose a Used 6.7 Cummins Engine?
Opting for a used 6.7 Cummins engine offers several advantages over alternatives:
- Cost-effective alternative to new engines ($6,499 used vs $14,000 to $22,000 for new crate)
- Cost-effective alternative to remanufactured units ($6,499 used vs $9,500 to $14,000 for reman)
- Proven reliability and performance of the Cummins B-series platform
- Wide availability of parts and aftermarket support for ongoing maintenance and performance upgrades
- Potential for significant power upgrades through ECM tuning, intake / exhaust modifications, and (for off-road / competition use) emissions delete kits
Find Your Perfect 6.7 Cummins Engine Today
Whether you’re replacing a worn engine in your daily-driven Ram 2500, restoring a contractor work truck, or building a high-performance Cummins-powered project, our selection of used 6.7 Cummins engines for sale has you covered. With options spanning all four generations and both Standard and High Output variants, you’re sure to find the right engine for your truck.
Browse our inventory of 6.7 Cummins engines for sale now, or contact our team for personalized recommendations matching your specific year, body code, and trim. Experience the power and reliability of a Cummins diesel in your truck. Your journey to enhanced performance starts here!
Vehicle Compatibility
| Vehicle | Compatibility |
|---|---|
| Dodge Ram 2500 / Ram 2500 (2007.5 to Current) | All generations of 6.7 Cummins Standard and HO variants |
| Dodge Ram 3500 / Ram 3500 (2007.5 to Current) | All generations of 6.7 Cummins Standard and HO variants |
| Ram 4500 Chassis Cab (2008 to Current) | Medium-duty work truck with 6.7 Cummins |
| Ram 5500 Chassis Cab (2008 to Current) | Medium-duty work truck with 6.7 Cummins |
| Freightliner Business Class M2 (Various Years) | Medium-duty commercial truck with 6.7 Cummins option |
| NOT Applicable: Class 8 Heavy-Duty Trucks (Cascadia, T680, 579) | These use larger ISX15 / X15, not 6.7L ISB |
| Generation Identification | Gen 1 (2007.5 to 2012, CP3, no DEF) │ Gen 2 (2013 to 2018, CP3, DEF added) │ Gen 3 (2019 to 2023, CP4.2) │ Gen 4 (2024 plus) |
Condition and Inspection
- Generation verified (Gen 1 / Gen 2 / Gen 3 / Gen 4)
- Donor vehicle confirmed (Ram 2500 / 3500 / 4500 / 5500 / Freightliner M2)
- Year of production identified
- Fuel system identified (Bosch CP3 or Bosch CP4.2)
- Emissions equipment documented (DPF / EGR only vs DPF / EGR / SCR / DEF)
- Power rating verified (Standard Output or High Output)
- Compression tested across all 6 cylinders
- Oil pressure verified at cold and warm operation
- VGT turbocharger actuator condition assessed
- HPCR injector function confirmed
- EGR cooler inspected (known wear point especially on Gen 1)
- Cylinder head stud / bolt condition noted
- Block casting numbers documented
- Oil pan and rear main seal inspected
- Front cover / timing gear noise assessed
- Block heater function verified (where equipped)
- Mileage from donor truck noted
- Generation correctly identified (avoid receiving wrong generation for your truck)
- Fuel system documented (CP3 vs CP4.2 critical for compatibility)
- Standard Output vs High Output verified
- Donor truck history documented
- All 6 cylinders compression tested before shipping
- VGT turbo function verified
- HPCR injector operation confirmed
- Emissions equipment noted
- Free freight pallet delivery to all 50 states
- 15 day replacement warranty on internal defects
- Cummins B-series experienced support team
- Cross-reference assistance for engine swap projects
James Miller (verified owner) –
I bought a used 6.7 Cummins engine from Vaz Auto Solutions for my Ram 2500. It arrived promptly and performs like new. Great power and reliability. Highly satisfied!
Robert Johnson (verified owner) –
Purchased a used 6.7 Cummins engine from Vaz Auto Solutions for my Dodge Ram. Installation was straightforward, and the engine runs smoothly. It’s a fantastic upgrade with excellent performance.