Cummins QSB6.7 550HP Marine Diesel Engine

Description

New Cummins QSB6.7 550HP Marine Diesel Engine For Sale

The Cummins QSB6.7 550HP Marine Diesel Engine is a high-performance, electronically controlled marine propulsion engine designed to deliver exceptional power, fuel efficiency, and long-term reliability for demanding commercial and recreational marine applications. Supplied brand new by Coastal Wave Marine, every engine is delivered in a complete factory marine configuration with genuine standard manufacturer accessories, ensuring installation integrity, regulatory compliance, and dependable operation from day one.

Built on Cummins’ proven 6.7-litre inline six-cylinder platform, the Cummins QSB6.7 550HP combines advanced Bosch High-Pressure Common Rail (HPCR) fuel injection, turbocharging, seawater aftercooling, and sophisticated electronic engine management to produce outstanding acceleration, responsive throttle control, and excellent torque across the operating range.

Designed for operators who require reliable high-speed performance without compromising efficiency, the QSB6.7 550HP offers an excellent power-to-weight ratio, reduced emissions, and the proven durability that has made Cummins one of the world’s leading marine engine manufacturers.

Key Features

• 550 HP electronically controlled marine diesel engine
• Proven 6.7-litre inline six-cylinder platform
• Bosch High-Pressure Common Rail (HPCR) fuel injection
• Turbocharged with seawater aftercooling
• Excellent power-to-weight ratio
• Strong low-end torque and rapid throttle response
• Electronic Engine Control Module (ECM)
• EPA Tier 3 marine emissions compliant
• Available with multiple marine transmission configurations
• Supported by Cummins’ global dealer and service network

Engineered for Demanding Marine Applications

The Cummins QSB6.7 550HP Marine Diesel Engine has been engineered to provide dependable propulsion across a wide variety of commercial and recreational vessels, including:

• High-performance sportfishing boats
• Offshore patrol vessels
• Crew transfer vessels
• Pilot boats
• Commercial workboats
• Rescue and emergency response craft
• Express cruisers
• Luxury motor yachts
• Government and law enforcement vessels

Its advanced electronic fuel management system delivers smooth power delivery, clean combustion, low visible smoke, and excellent fuel efficiency while maintaining outstanding performance under heavy operating conditions. The engine’s strong low-end torque allows vessels to accelerate quickly while providing stable power throughout extended cruising and continuous-duty operations.

Fully compliant with EPA Tier 3 marine emissions standards, the Cummins QSB6.7 550HP is designed to meet modern environmental regulations without sacrificing performance or reliability.

Backed by Cummins’ extensive worldwide service network, owners benefit from readily available genuine parts, factory-trained technicians, and comprehensive technical support in major marine markets around the globe.

An Intelligent Repower Solution

The Cummins QSB6.7 550HP is an excellent repower option for vessels replacing older propulsion systems while improving overall performance, fuel economy, and operational reliability.

It is commonly specified as a replacement for:

• Cummins QSC8.3 marine engines
• Cummins 6CTA marine engines
• Earlier Cummins QSB6.7 variants
• Caterpillar C7 marine engines
• Volvo Penta D9 propulsion systems
• Other 500–600HP inboard marine diesel engines

The modern 6.7-litre platform delivers higher power density, improved electronic engine management, lower emissions, and enhanced fuel efficiency while maintaining a compact engine footprint that simplifies many repower installations.

For repower projects, Coastal Wave Marine provides professional technical assistance with:

• Gear ratio compatibility
• Shaft sizing evaluation
• Engine bed assessment
• Engine mount alignment
• Duty rating selection (M1, M2, and M3)
• Cooling system configuration
• Electronic control integration

This ensures every engine package is properly matched to your vessel’s displacement, operating profile, and propulsion requirements.

Standard Manufacturer Accessories Included

Every Cummins QSB6.7 550HP Marine Diesel Engine supplied by Coastal Wave Marine includes genuine standard manufacturer accessories rather than aftermarket substitutions.

Each factory marine package includes:

• Heat exchanger marine cooling system
• Seawater aftercooler
• Wet exhaust manifold
• Marine Electronic Control Module (ECM)
• Complete engine wiring harness
• Primary alternator
• Starter motor
• Front engine mounting brackets with vibration isolators
• SAE flywheel housing
• Factory documentation and operator manuals

Every engine is supplied as a purpose-built marine propulsion engine, ensuring factory quality, proper marine certification, and long-term operational reliability.

Flexible Configuration Options

To accommodate different vessel layouts and operational requirements, the Cummins QSB6.7 550HP Marine Diesel Engine can be supplied in multiple factory configurations, including:

• Engine-only (bobtail configuration)
• Engine with ZF marine gearbox
• Engine with Twin Disc marine transmission
• Complete propulsion package with electronic controls
• Heat exchanger cooled configuration
• Keel cooled configuration
• Twin-engine installation packages

Optional equipment is also available to customize your propulsion package, including:

• Electronic control stations
• Secondary alternators
• Fuel filtration upgrades
• Digital engine monitoring systems
• Custom transmission ratios
• Installation accessories

Our technical team can recommend the most suitable configuration based on your vessel’s intended application and operational profile.

Worldwide Supply and Logistics

Coastal Wave Marine supplies new Cummins marine diesel engines to customers worldwide, providing complete export and logistics support from quotation through final delivery.

Our international supply services include:

• Professional marine export crating
• Export documentation
• Commercial invoicing
• Freight forwarding coordination
• Port delivery
• Shipyard delivery support
• Worldwide shipping assistance

We regularly supply Cummins marine propulsion systems throughout North America, Europe, the Caribbean, South America, the Middle East, Asia-Pacific, and Africa, ensuring customers receive reliable logistics support regardless of project location.

Technical Specifications

Manufacturer Warranty

Every new Cummins QSB6.7 550HP Marine Diesel Engine supplied by Coastal Wave Marine is backed by the official Cummins manufacturer’s limited warranty, subject to regional warranty policies, proper installation, and product registration.

Our team assists customers with warranty registration, technical documentation, and product support to help ensure full manufacturer warranty coverage and long-term peace of mind.

Why Choose Coastal Wave Marine?

Coastal Wave Marine specializes in supplying genuine commercial and recreational marine propulsion systems supported by technical expertise and responsive customer service.

When you purchase from Coastal Wave Marine, you benefit from:

• Genuine new Cummins marine engines
• Expert technical configuration assistance
• Professional repower consultation
• Worldwide logistics coordination
• Transparent technical specifications
• Comprehensive export documentation
• Responsive after-sales customer support

Selecting the correct propulsion package is essential for maximizing vessel performance, fuel efficiency, and long-term reliability. Our experienced technical team works closely with every customer to ensure each Cummins QSB6.7 550HP Marine Diesel Engine is correctly specified for its intended application.

Frequently Asked Questions

Is the Cummins QSB6.7 550HP supplied brand new?

Yes. Every engine supplied by Coastal Wave Marine is factory new and delivered with genuine manufacturer components, documentation, and standard marine accessories.

Can the engine be supplied with a marine gearbox?

Yes. We offer compatible ZF and Twin Disc marine transmissions that can be configured to match your vessel’s propulsion requirements.

Is the Cummins QSB6.7 550HP suitable for repower projects?

Absolutely. It is widely used to replace older Cummins, Caterpillar, Volvo Penta, and other marine diesel engines within the 500–600HP power range while improving performance and fuel efficiency.

Do you ship Cummins marine engines internationally?

Yes. We provide worldwide shipping with complete export documentation, freight forwarding coordination, and delivery to ports, marinas, and shipyards worldwide.

Is a keel-cooled version available?

Yes. Both heat exchanger-cooled and keel-cooled configurations are available depending on your vessel’s operating environment and cooling requirements.

Can Coastal Wave Marine help configure the correct engine package?

Yes. Our technical sales specialists can recommend the appropriate gearbox ratio, cooling configuration, duty rating, and propulsion package based on your vessel specifications and operating requirements.

Request a Quote for the Cummins QSB6.7 550HP Marine Diesel Engine

Whether you’re specifying propulsion for a new vessel or planning a professional repower, Coastal Wave Marine can supply the Cummins QSB6.7 550HP Marine Diesel Engine configured to your exact operational requirements.

Contact our technical sales team today to discuss pricing, availability, compatible marine gearboxes, lead times, and worldwide shipping options. We are committed to supplying genuine Cummins marine propulsion solutions backed by expert technical guidance, reliable logistics, and dedicated after-sales support.