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The Cummins QSB 6.7 engine is a top-tier marine diesel engine known for its quiet operation, superior fuel efficiency, and exceptional durability. Designed with the latest advancements in diesel technology, this engine is widely used in commercial and recreational vessels alike. Whether you’re doing a full engine rebuild or performing routine service, Diesel Pro Power has the Cummins QSB 6.7 parts you need—backed by fast, worldwide shipping and exceptional customer service. The Cummins QSB 6.7 is a 6-cylinder, 6.7-liter marine engine designed to deliver smooth performance even in demanding marine environments. It uses High-Pressure Common Rail (HPCR) fuel injection, electronic control systems, and a full-authority ECM to maximize power, reduce noise, and meet global emissions standards. Key features include: 80% idle noise reduction for a quieter boating experience Tier 2 and Tier 3 emissions compliance Advanced turbocharging and aftercooling Low vibration and marine-specific mounting systems Compact footprint ideal for tight engine compartments This engine is commonly used in patrol boats, ferries, workboats, pleasure yachts, and onboard generators. The QSB 6.7’s robust design and flexible power output make it ideal for a range of vessel types and marine systems. Common applications include: Passenger ferries Pilot boats Workboats and harbor tugs Coastal and inshore fishing vessels Yachts and cruisers Sportfishing boats Sailing vessels with auxiliary engines Marine generators Hydraulic pump systems Winch and bow thruster drives The QSB 6.7 is trusted worldwide for its ability to combine power and efficiency in marine-specific conditions such as salt exposure, vibration, and variable load demand. Diesel Pro Power makes it easy to find and order parts for Cummins QSB 6.7 engines through our streamlined, mobile-friendly online catalog. Whether you're performing a complete rebuild or replacing individual parts, our extensive inventory has you covered. When it’s time for a major overhaul, we offer all-in-one kits that save you time and eliminate compatibility issues: Pistons Crankshaft shell sets Connecting rod shell sets Upper and lower gasket sets Piston ring sets Cylinder head gaskets Also available: Filter removal tools, seal kits, RTV silicone, and installation accessories. Cylinder heads are essential for compression, airflow, and valve operation. Our catalog includes: Heads with or without springs and valves Valve springs, valve seals, and locks Head bolts and cover gaskets All heads are manufactured and inspected to meet marine-grade performance standards. Keep raw water flowing efficiently with our corrosion-resistant seawater pump components: Pulley-driven seawater pump units Zinc anodes Seals and bearings Strainers and inlet fittings These components are designed to handle continuous saltwater exposure while maintaining flow performance. Freshwater circuits are critical to thermal management in a closed-loop cooling system. Our inventory includes: Freshwater pumps Pump impellers Temperature switches and sensors Marine-grade gauges and panels All parts are compatible with Cummins’ marine cooling designs and resistant to rust and scaling. Diesel Pro Power offers everything from primary systems to support accessories to keep your engine running like new. Camshafts Lifters and followers Pushrods and rockers Precision-machined components to ensure accurate valve timing and reduced friction loss. Control cables (throttle, shift) Start/stop toggle switches Marine-grade harness connectors Designed for reliability under vibration, humidity, and saltwater conditions. High-efficiency spin-on oil filters Fuel/water separators Filter bases and brackets Prevent contamination and maximize injection performance in variable marine fuel conditions. Oil pressure and temp sensors Water temperature sensors RPM and voltage gauges Analog and digital marine gauge clusters Accurate, waterproof, and easy to install on modern or legacy vessels. Complete gasket kits Head and valve cover gaskets RTV sealants Cummins engine enamel paint Protective finishes and leak-proof seals are essential for performance and appearance. Time is money. We ship every order within 24 hours, delivering to marinas, shipyards, ports, and maintenance hubs around the world. Search by engine model, component type, or visual match. Our site is built for marine engineers, fleet managers, and DIY owners alike—fast, intuitive, and precise. We update our systems with the latest security patches and encrypt all data, ensuring your order details and payment info stay safe. Our experienced team is here to help with: Part identification Fitment verification Installation guidance Emergency shipping options Contact us by phone or email, and get answers from real people with diesel expertise. We’re proud to support over 40,000 customers around the world, many of whom return to us again and again for the parts, support, and service they can’t find elsewhere. Don’t take our word for it. Browse our reviews to hear how Diesel Pro Power has helped captains, technicians, and marine professionals across 130+ countries. The Cummins QSB 6.7 represents one of the most advanced and reliable mid-range diesel platforms in the industry today. Building on the legacy of the B-Series engines, this model integrates sophisticated electronic controls, a high-pressure common rail fuel system, and emissions technologies designed to meet stringent global standards. Whether powering a marine auxiliary generator, industrial machinery, or off-highway equipment, the QSB 6.7 delivers exceptional performance, minimal maintenance demands, and an impressive track record of durability. Designed for Tier 3 and Tier 4 Final compliance, the QSB 6.7 is commonly used in applications where emissions, fuel efficiency, and operational flexibility are mission-critical. With its compact footprint and high power-to-weight ratio, the engine is a top choice for OEMs and aftermarket rebuilders alike, offering seamless integration into both new and legacy equipment across a wide spectrum of industries. Specification Detail Configuration Inline 6-cylinder, 4-stroke diesel Displacement 6.7 liters (408 cubic inches) Bore x Stroke 4.21 in x 4.88 in (107 mm x 124 mm) Compression Ratio 17.3:1 Aspiration Turbocharged with Aftercooling / VGT options Fuel System High-Pressure Common Rail (HPCR) Emissions Tier Tier 3 / Tier 4 Final / EU Stage V Power Range 173 – 300 HP (129 – 224 kW) Peak Torque 520 – 750 lb-ft (705 – 1,017 Nm) Oil Capacity 16–18 quarts (15–17 liters) Cooling System Liquid-cooled Engine Management Full-authority ECM (CAN bus capable) Dry Weight Approx. 1,150 lbs (521 kg) The QSB 6.7’s robust cast-iron construction, electronically managed fuel delivery, and advanced turbocharging make it a versatile and powerful solution for demanding operational profiles. High-Pressure Common Rail (HPCR) System: Enhances fuel atomization and allows for precise injection timing, reducing emissions and increasing efficiency. Full-Authority Electronic Controls: The ECM manages all engine functions, enabling real-time diagnostics, custom tuning, and adaptive performance across a wide range of duty cycles. Variable Geometry Turbocharger (VGT) (in Tier 4 Final variants): Offers improved low-end torque, enhanced throttle response, and integrated engine braking support. Integrated Emissions Control: Tier 4 Final models include diesel particulate filters (DPF), diesel oxidation catalysts (DOC), and selective catalytic reduction (SCR) systems for maximum compliance. Noise and Vibration Reduction: Balanced design and advanced fuel management contribute to smoother, quieter operation in sensitive environments like marinas and urban worksites. The QSB 6.7 is widely respected in the marine industry for its clean emissions, reliable output, and seamless integration into auxiliary and generator roles. Its electronic features are particularly useful in vessels that require strict compliance with international maritime emissions regulations. Marine Generator Sets: Supplies stable onboard power for vessels such as tugboats, supply ships, ferries, and private yachts. Auxiliary Drive Systems: Operates winches, pumps, and other hydraulics in commercial vessels and workboats. Fire Pumps and Emergency Power Units: Ensures critical support systems operate independently of propulsion engines. Vessel HVAC and Watermakers: Supports comfort systems, desalination equipment, and refrigeration in long-haul maritime operations. The QSB 6.7's compact form and programmable ECM allow marine technicians to fine-tune performance while minimizing fuel consumption and emissions—an increasingly important factor in green port operations and emission control areas (ECAs). In industrial contexts, the QSB 6.7 is a workhorse powering a wide array of stationary and mobile equipment. Its torque-rich powerband, emissions readiness, and serviceable design make it well-suited to both urban and remote applications. Standby and Prime Generators: Used in hospitals, data centers, utility stations, and disaster recovery systems. Mobile Trailer Gensets: Reliable power for construction crews, outdoor events, or mining camps. Industrial Facilities: Continuous-duty systems for remote plants, water treatment stations, and agricultural operations. With its Tier 4 Final compliance, the QSB 6.7 is ideal for operations in environmentally regulated zones while maintaining runtime reliability even under full load. The QSB 6.7 is a favorite among OEMs producing compact and mid-sized heavy equipment. It’s found in a wide variety of machines where Tier 3 or Tier 4 compliance is needed but space is at a premium. Wheel Loaders and Excavators Telehandlers and Forklifts Graders, Pavers, and Road Rollers Directional Drills and Pipeline Equipment Aerial Platforms and Boom Lifts Its excellent torque curve and electronic integration options allow fine control over throttle and load responses—important for safety, efficiency, and emissions performance. Operators in oil and gas fields often choose the QSB 6.7 for its rugged reliability, extended service intervals, and emissions compliance, even in dusty or extreme climates. Pump Skids and Frac Units Trailer-Mounted Light Towers Mobile Power Packs Heater Systems for Fluids and Gases The engine’s diagnostics can be remotely monitored, reducing downtime and allowing scheduled maintenance in isolated work zones. The QSB 6.7 also sees broad use in agricultural settings where mid-range diesel power is needed for equipment and backup systems. Irrigation and Drainage Pumps Grain Elevators and Handling Systems Mobile Refrigeration and Storage Units Farm Backup Gensets and PTO Drives The long service life and strong low-end torque make it particularly valuable for high-demand tasks during harvest or irrigation cycles. Â
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About the Cummins QSB 6.7 Engine
Quiet, Powerful, and Built for Marine Demands
Marine Applications for the Cummins QSB 6.7 Engine
Commercial Vessels
Recreational Boats
Auxiliary Power Systems
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Rebuild Kits for Cummins QSB 6.7
Cylinder Heads for Cummins QSB 6.7
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Engine Specifications & Applications of the Cummins QSB 6.7 Engine
Introduction
Cummins QSB 6.7 Engine Specifications
Key Features of the QSB 6.7
Marine Applications of the Cummins QSB 6.7
Common Marine Uses
Industrial Applications of the Cummins QSB 6.7
Generator Sets and Backup Power
Construction and Off-Highway Equipment
Oilfield and Remote Energy Support
Agricultural Applications
