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The Cummins QSB 7 engine is a powerful, emissions-compliant marine diesel engine designed for exceptional durability and smooth, quiet operation. Whether you operate a workboat, yacht, or auxiliary power system, the QSB 7 is built to meet the demands of commercial and recreational use. At Diesel Pro Power, we offer a full line of Cummins QSB 7 parts—shipped globally within 24 hours and supported by expert service. The Cummins QSB 7 is a 6-cylinder, 6.7-liter engine (often referred to as 7.0L-class due to advanced upgrades) designed for marine propulsion and onboard power. Featuring a high-pressure common rail fuel system, full-authority ECM, and a robust cooling architecture, it’s one of the most advanced options in Cummins’ midrange marine portfolio. Key features include: Quiet operation and low vibration Integrated diagnostics and fuel mapping via ECM EPA Tier 3 and IMO-compliant emissions systems Turbocharged and aftercooled Optimized for high-load marine conditions The QSB 7 balances efficient fuel use with high torque output, making it ideal for propulsion or auxiliary duty in a variety of vessels. The Cummins QSB 7’s durability and quiet profile make it suitable for both heavy-duty commercial applications and refined recreational settings. Pilot boats and patrol craft Passenger ferries and water taxis Luxury yachts and trawlers Commercial fishing vessels Harbor workboats and support vessels Onboard marine generators Bow thruster power units Hydraulic pump drive systems Firefighting and emergency pump sets Its flexible mounting options and compact size make it ideal for engine room retrofits and new vessel designs alike. Our inventory covers every major component of the Cummins QSB 7 marine engine, including hard-to-find parts for cooling, fuel, sensors, and full rebuilds. Complete your engine overhaul with all-in-one kits, available in full or top-end/bottom-end options: Pistons and rings Crankshaft shell sets Connecting rod shell sets Upper and lower gasket sets Cylinder head gaskets We also offer seal kits, cleaning compounds, and essential rebuild tools to help you finish the job right the first time. Precision-manufactured heads and parts ensure peak compression and valve timing: Cylinder heads with or without valves Valve springs and retainers Head bolts Valve seals and gaskets All heads are marine-grade and tested to resist corrosion, pitting, and thermal stress. Raw water cooling systems demand reliable components: Pulley-driven seawater pump assemblies Zinc anodes Inlet strainers and fittings Pump seals and bearings Protect your cooling system from salt buildup and flow interruptions. These components keep your internal cooling circuit performing in closed-loop setups: Freshwater pumps Thermostat housings and gaskets Temperature sensors Coolant expansion tanks and lines Marine-rated parts built to resist scale and high operating pressures. Our catalog extends beyond major systems to cover everything you need for diagnostics, controls, and daily maintenance. Primary and secondary fuel filters Fuel pumps Water separators Injector seals and lines Protect fuel quality and ensure proper pressure for marine efficiency and emissions compliance. Camshafts Tappets and lifters Rockers, pushrods, and bearings Maintain precise valve timing under high-load and high-RPM marine conditions. Oil pressure sensors Coolant temp sensors Exhaust gas temp (EGT) sensors Start/stop toggle switches and engine shutdown modules Built for marine reliability—resistant to vibration, corrosion, and moisture. Oil filters Marine fuel filters Breather filters Filter mounts and adapters Help extend the life of your engine and improve fuel economy in continuous-use conditions. Tachometers Oil and temp gauges Voltage displays Hour meters and digital readouts Multi-function marine panels Pre-calibrated for QSB specs and saltwater-protected for helm or engine room installation. Downtime is costly. We ship parts anywhere in the world within 24 hours so you can get back on the water faster. Our team knows Cummins marine engines inside and out. Whether you need help identifying a part or troubleshooting a fault code, we’re here to assist by phone or email. Ship captains, marine engineers, and maintenance professionals across 130+ countries rely on Diesel Pro Power for: Accurate parts Fast shipping Expert support Exceptional customer care Find what you need quickly with our intuitive website. Search by part type, engine model, or system category. Place orders in minutes with secure checkout and real-time inventory. See why our customers return again and again. Read verified reviews that highlight our reliability, speed, and service quality. The Cummins QSB 7.0 is one of the most powerful and emissions-compliant engines in the Quantum System B-Series lineup. Though it shares the same displacement base as the QSB 6.7, the QSB 7.0 is specifically engineered as a high-output variant optimized for heavy-duty applications that demand more torque, advanced emissions controls, and precise electronic calibration. Built for Tier 4 Final and EU Stage V compliance, the QSB 7.0 is designed to thrive in environments where performance, reliability, and clean operation are non-negotiable. This engine is often deployed in premium-grade industrial and marine equipment, such as large generator sets, high-capacity hydraulic systems, and workboats that operate in regulated waters. For the aftermarket sector, the QSB 7.0 provides a near-perfect upgrade path for older engines that need to meet new emissions laws without compromising performance or uptime. Specification Detail Configuration Inline 6-cylinder, 4-stroke diesel Displacement 6.7 liters (marketed as “7.0” for duty classification) Bore x Stroke 4.21 in x 4.88 in (107 mm x 124 mm) Compression Ratio 17.3:1 Aspiration Turbocharged / Aftercooled / VGT (select models) Fuel System High-Pressure Common Rail (HPCR) Emissions Compliance Tier 4 Final / EU Stage V Power Range 230 – 320 HP (172 – 239 kW) Peak Torque 575 – 800 lb-ft (780 – 1084 Nm) Cooling System Liquid-cooled Engine Management Full-authority ECM with CAN-bus Oil Capacity 17–19 quarts (16–18 liters) Dry Weight Approx. 1,150–1,250 lbs (521–567 kg) Though labeled “7.0,” this engine is based on Cummins’ 6.7L block. The difference lies in its more aggressive fueling, higher-output calibration, and compatibility with larger emissions control modules, tailored for use in severe-duty applications. Full-Authority ECM: Precision control of fuel delivery, turbo response, diagnostics, throttle settings, and load management. High-Output HPCR System: Supports elevated fuel pressures for better combustion, faster throttle response, and increased torque. Integrated Emissions Technology: Tier 4 Final and Stage V compliance via DPF, DOC, and SCR systems. Variable Geometry Turbocharger (VGT): Available on some configurations for optimized torque at low RPM and improved engine braking. Smart Idle and Load Sensing: Enhances fuel economy during variable-load conditions typical in marine and utility applications. For marine professionals, the QSB 7.0 is a natural choice when higher auxiliary output or backup power is needed without moving up to a physically larger platform. Its Tier 4 Final compliance makes it fully legal for operation in Emission Control Areas (ECAs) such as U.S. coasts, Canadian inland waterways, and EU ports. Large Marine Generator Sets: Power for electrical systems in workboats, fishing vessels, ferries, and offshore rigs. Hydraulic Drive Engines: Supports bow/stern thrusters, anchor winches, deck cranes, and bilge systems. Fire Pump and Emergency Systems: Operates independently of propulsion engines for redundancy. Support Craft & Service Barges: Primary or auxiliary engine in small tugs, dredgers, and service boats. Hybrid Marine Systems: Integrated into dual-mode propulsion + generator packages for advanced vessel systems. The QSB 7.0’s strong low-end torque, programmable load profiles, and emissions credentials make it ideal for marine engineers retrofitting older vessels or designing new systems in tight emissions zones. The QSB 7.0 has become increasingly prominent in the industrial sector as a reliable Tier 4 Final solution that can handle constant heavy-duty work with fewer service intervals and less fuel consumption. Prime Power for Remote Sites: Mining camps, oil rigs, and remote construction projects. Standby Power: Hospitals, telecom hubs, military bases, and data centers. Mobile Generator Sets: Mounted trailer units for municipalities, disaster response, or temporary industrial setups. Hybrid Gensets: Integrated into systems that combine battery storage and diesel power for load balancing. The QSB 7.0’s HPCR system is well-suited for rapid load response and precise control, a key factor in today’s smart grid and off-grid applications. This engine powers large off-highway equipment where a compact but powerful engine is needed to meet emissions regulations. Excavators, Graders, and Loaders Road Rollers, Pavers, and Milling Machines Directional Drills, Trenchers, and HDD Rigs Cranes, Forklifts, and Material Handlers With its responsive electronic control and robust torque output, the QSB 7.0 thrives in environments where power density and emissions compliance are critical. In oil and gas, the QSB 7.0 is trusted in mobile skids, pressure pumping units, and utility trailers that must perform reliably under extreme conditions. Frac Support Pumps Mud Mixing Units Lighting Towers Booster Compressors These roles often require consistent output over long durations, which the QSB 7.0 is built to handle without overheating, derating, or exceeding emissions limits. With increasingly strict emissions laws affecting agricultural diesel engines, the QSB 7.0 meets the need for high-output, low-emissions power in: Diesel-Powered Irrigation Pumps Grain Elevators and Dryers Compost Turners and Wood Grinders Heavy Sprayers and Spreaders Its advanced calibration allows for efficient fuel use in stop-start cycles common in field work.
Cummins QSB 7.0 Parts
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About the Cummins QSB 7 Engine
Power and Reliability on the Water
Marine Applications for the Cummins QSB 7 Engine
Common Vessel Types
Auxiliary Systems
Cummins QSB 7 Parts Available at Diesel Pro Power
Rebuild Kits for Cummins QSB 7
Cylinder Heads for Cummins QSB 7
Seawater Pumps for Cummins QSB 7
Freshwater Cooling Components For Cummins QSB 7
More Cummins QSB 7 Marine Parts in Stock
Fuel System Parts For Cummins QSB 7
Camshafts and Valve Train For Cummins QSB 7
Sensors and Switches For Cummins QSB 7
Filters and Fluids For Cummins QSB 7
Marine Gauges and Control Panels
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Engine Specifications & Applications of the Cummins QSB 7.0 Engine
Overview
Cummins QSB 7.0 Engine Specifications
Advanced Features of the QSB 7.0
Marine Applications of the Cummins QSB 7.0
Common Marine Uses
Industrial Applications of the Cummins QSB 7.0
Generator Applications
Off-Highway Equipment
Oilfield & Energy Sector
Agricultural & Environmental Machinery
