Cummins QSB6.7 425HP Marine Diesel Engine

DescriptionCummins QSB6.7 425HP Marine Diesel Engine for Sale | Coastal Wave MarineThe Cummins QSB6.7 425HP Marine Diesel Engine is a high-performance marine propulsion engine engineered for demanding commercial marine applications and premium recreational vessels requiring strong acceleration and sustained cruising power. Supplied brand new by Coastal Wave Marine, this engine is delivered in full marine configuration with genuine standard manufacturer accessories, ensuring installation accuracy, regulatory compliance, and long-term operational reliability.Built on Cummins’ proven 6.7-litre inline six-cylinder platform, the Cummins QSB6.7 marine diesel engine integrates Bosch High-Pressure Common Rail (HPCR) fuel injection, precision turbocharging, and seawater aftercooling to deliver responsive torque, efficient fuel combustion, and stable performance in the 425 horsepower class.This output level is particularly suited to planing hulls, fast commercial craft, and performance yachts that require higher power density without sacrificing durability.Designed for High-Load Marine ApplicationsThe Cummins QSB6.7 425HP Marine Diesel Engine is widely specified for:Offshore commercial workboatsHigh-speed patrol vesselsPassenger transport boatsWindfarm and service support vesselsSport and performance motor yachtsFast planing hull configurationsThe 425HP rating delivers enhanced torque and faster acceleration compared to lower QSB6.7 variants, supporting heavier vessels and higher cruising speeds while maintaining fuel efficiency.Operational advantages include:Strong mid- to high-range torque deliverySmooth and stable throttle responseReduced vibration and onboard noise levelsEfficient combustion with minimal visible smokeCompliance with EPA Tier 3 marine emissions standardsAdvanced Electronic Control and MonitoringThe Cummins QSB6.7 marine propulsion system incorporates a fully integrated electronic control module (ECM) designed to manage and protect engine performance under varying operating conditions.The ECM monitors:Fuel injection timing and pressureEngine load and duty cycleLubrication and cooling system parametersRPM stability and operational thresholdsThis system enhances operational reliability, supports preventative maintenance scheduling, and reduces the likelihood of unexpected downtime.High-Performance Repower SolutionThe Cummins QSB6.7 425HP Marine Diesel Engine is a strategic repower replacement for:Cummins 6BTA 5.9 and QSB5.9 engines in the 350–420HP rangeComparable mid-range 400HP inboard diesel enginesAging mechanical propulsion systems requiring modern emissions complianceIts compact installation footprint and accessible service layout simplify retrofitting into existing engine rooms while delivering improved power output and efficiency.Coastal Wave Marine provides technical assistance with:Gear ratio matchingShaft and driveline compatibility reviewCooling system configuration (heat exchanger or keel cooled)Engine mount alignment consultationDuty rating selection (M1, M2, M3 classifications)Standard Manufacturer Accessories IncludedEach new Cummins QSB6.7 425HP marine engine supplied by Coastal Wave Marine includes genuine standard manufacturer accessories, ensuring full marine propulsion specification.Standard equipment includes:Marine heat exchanger cooling systemSeawater aftercoolerWet exhaust manifoldMarine electronic control module (ECM)Engine wiring harnessPrimary alternatorStarter motorFront engine mounts with isolatorsSAE flywheel housingFactory manuals and documentationThis guarantees delivery of a properly configured marine engine rather than a converted industrial unit.Flexible Configuration OptionsThe Cummins QSB6.7 425HP Marine Diesel Engine can be supplied in multiple configurations:Engine-only (bobtail specification)With ZF marine transmissionWith Twin Disc marine gearboxComplete propulsion package with integrated electronic controlsHeat exchanger cooled configurationKeel cooled configurationSlimline option for restricted engine room installationsEach configuration is tailored to vessel displacement, hull design, and operational profile.Global Supply and Export SupportCoastal Wave Marine supplies new Cummins marine diesel engines worldwide, providing:Secure marine cratingExport documentation and commercial invoicingCoordination with international freight forwardersDelivery to shipyards, ports, and marinas globallyWe support commercial operators, shipyards, and private vessel owners across North America, Europe, the Caribbean, the Middle East, Asia-Pacific, and Africa.Technical Specifications – Cummins QSB6.7 425HPSpecificationDetailsEngine ModelCummins QSB6.7Power Output425 HPEngine ConfigurationInline 6-Cylinder, 4-Stroke DieselDisplacement6.7 LitresAspirationTurbocharged and Seawater AftercooledFuel SystemBosch High-Pressure Common RailCooling SystemHeat Exchanger Cooled (Keel Cooling Optional)EmissionsEPA Tier 3 Marine CertifiedElectrical Options12V or 24V SystemsRotationCounterclockwise (Facing Flywheel)Why Choose Coastal Wave MarineCoastal Wave Marine specializes in supplying brand-new Cummins marine engines with verified configuration and professional support.We provide:Genuine new engine sourcingRepower consultation and configuration assistanceComplete propulsion package optionsInternational logistics coordinationClear technical documentation and responsive supportWhen selecting the Cummins QSB6.7 425HP Marine Diesel Engine, correct configuration and dependable supply are critical. Coastal Wave Marine ensures each engine is accurately specified, properly documented, and prepared for reliable marine operation.