Cummins QSB6.7 425HP Marine Diesel Engine

Description

Cummins QSB6.7 425HP Marine Diesel Engine for Sale | Coastal Wave Marine

The 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 Applications

The Cummins QSB6.7 425HP Marine Diesel Engine is widely specified for:

• Offshore commercial workboats

• High-speed patrol vessels

• Passenger transport boats

• Windfarm and service support vessels

• Sport and performance motor yachts

• Fast planing hull configurations

The 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 delivery

• Smooth and stable throttle response

• Reduced vibration and onboard noise levels

• Efficient combustion with minimal visible smoke

• Compliance with EPA Tier 3 marine emissions standards

Advanced Electronic Control and Monitoring

The 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 pressure

• Engine load and duty cycle

• Lubrication and cooling system parameters

• RPM stability and operational thresholds

This system enhances operational reliability, supports preventative maintenance scheduling, and reduces the likelihood of unexpected downtime.

High-Performance Repower Solution

The 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 range

• Comparable mid-range 400HP inboard diesel engines

• Aging mechanical propulsion systems requiring modern emissions compliance

Its 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 matching

• Shaft and driveline compatibility review

• Cooling system configuration (heat exchanger or keel cooled)

• Engine mount alignment consultation

• Duty rating selection (M1, M2, M3 classifications)

Standard Manufacturer Accessories Included

Each 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 system

• Seawater aftercooler

• Wet exhaust manifold

• Marine electronic control module (ECM)

• Engine wiring harness

• Primary alternator

• Starter motor

• Front engine mounts with isolators

• SAE flywheel housing

• Factory manuals and documentation

This guarantees delivery of a properly configured marine engine rather than a converted industrial unit.

Flexible Configuration Options

The Cummins QSB6.7 425HP Marine Diesel Engine can be supplied in multiple configurations:

• Engine-only (bobtail specification)

• With ZF marine transmission

• With Twin Disc marine gearbox

• Complete propulsion package with integrated electronic controls

• Heat exchanger cooled configuration

• Keel cooled configuration

• Slimline option for restricted engine room installations

Each configuration is tailored to vessel displacement, hull design, and operational profile.

Global Supply and Export Support

Coastal Wave Marine supplies new Cummins marine diesel engines worldwide, providing:

• Secure marine crating

• Export documentation and commercial invoicing

• Coordination with international freight forwarders

• Delivery to shipyards, ports, and marinas globally

We 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 425HP

Why Choose Coastal Wave Marine

Coastal Wave Marine specializes in supplying brand-new Cummins marine engines with verified configuration and professional support.

We provide:

• Genuine new engine sourcing

• Repower consultation and configuration assistance

• Complete propulsion package options

• International logistics coordination

• Clear technical documentation and responsive support

When 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.