Cummins QSB6.7 355HP Marine Diesel Engine

Description

New Cummins QSB6.7 355HP Marine Diesel Engine for Sale at Coastal Wave Marine

The Cummins QSB6.7 355HP Marine Diesel Engine represents a refined balance of high output performance and long-term commercial durability. Supplied brand new by Coastal Wave Marine, this engine is delivered in full marine specification with genuine standard manufacturer accessories, ensuring proper configuration, regulatory compliance, and installation confidence.

As part of the established Cummins Marine Engines portfolio, the QSB6.7 platform is built on a robust 6.7-litre inline six-cylinder architecture. The 355HP rating is engineered for vessels requiring stronger acceleration, improved cruising capability, and dependable torque under sustained load.

Equipped with Bosch High-Pressure Common Rail (HPCR) fuel injection, advanced turbocharging, and seawater aftercooling, this engine provides efficient combustion, stable power delivery, and reduced operating emissions.

Designed for Demanding Marine Operations

The Cummins QSB6.7 355HP Marine Diesel Engine is frequently specified for:

• Offshore commercial workboats

• Patrol and enforcement vessels

• Passenger transport craft

• Windfarm and service vessels

• Performance motor yachts

• Semi-planing and planing hull applications

The 355HP configuration delivers enhanced torque output compared to lower horsepower variants, supporting heavier vessels and higher sustained cruising speeds without compromising fuel efficiency or mechanical reliability.

Operational strengths include:

• Immediate throttle response

• Stable RPM under variable load

• Reduced vibration for improved onboard comfort

• Optimized fuel efficiency across duty cycles

• Compliance with EPA Tier 3 marine emissions standards

Intelligent Electronic Control System

The Cummins QSB6.7 marine propulsion engine integrates a sophisticated electronic control module (ECM) designed to continuously regulate engine performance and safeguard critical systems.

The system monitors:

• Fuel injection timing

• Engine load and operational stress

• Cooling and lubrication parameters

• RPM and throttle calibration

This electronic management system enhances engine protection, reduces unexpected downtime, and supports preventative maintenance scheduling for both commercial and recreational operators.

Strategic Repower Upgrade

The Cummins QSB6.7 355HP Marine Diesel Engine is a practical repower alternative for replacing:

• Cummins 6BTA 5.9 engines in the 300–350HP range

• Mechanical QSB5.9 installations

• Comparable mid-range inboard diesel engines

Its installation footprint and mounting geometry allow efficient integration into existing engine rooms while delivering increased power density and modern emissions compliance.

Coastal Wave Marine provides professional assistance with:

• Gear ratio compatibility

• Shaft alignment and driveline review

• Cooling system configuration (heat exchanger or keel cooled)

• Mount positioning consultation

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

Standard Manufacturer Accessories Included

Each new Cummins QSB6.7 355HP marine engine supplied by Coastal Wave Marine includes genuine standard manufacturer accessories, ensuring the engine is delivered as a complete marine propulsion unit.

Standard components include:

• 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 documentation and manuals

This guarantees proper marine specification rather than a converted industrial engine configuration.

Flexible Configuration Options

The Cummins QSB6.7 355HP Marine Diesel Engine can be supplied in multiple configurations, including:

• Engine-only (bobtail specification)

• With ZF marine transmission

• With Twin Disc marine gearbox

• Complete propulsion package with integrated controls

• Heat exchanger cooled version

• Keel cooled configuration

• Slimline configuration for restricted engine rooms

Each configuration is reviewed against vessel displacement, hull design, and operational profile to ensure optimal propulsion performance.

International Supply and Export Capability

Coastal Wave Marine supports the global supply of new Cummins marine diesel engines, offering:

• Professional export crating

• Commercial documentation

• Freight coordination

• Delivery to shipyards, marinas, and ports worldwide

We regularly supply marine propulsion systems across North America, Europe, the Caribbean, the Middle East, Asia-Pacific, and Africa.

Technical Specifications – Cummins QSB6.7 355HP

Why Choose Coastal Wave Marine

Coastal Wave Marine specializes in the supply of brand-new Cummins marine engines with transparent configuration and technical accuracy.

Our service includes:

• Verified new engine sourcing

• Repower planning assistance

• Propulsion package configuration

• International logistics management

• Professional technical support

When selecting the Cummins QSB6.7 355HP Marine Diesel Engine, proper configuration and dependable supply are essential. Coastal Wave Marine ensures every engine is correctly specified, documented, and prepared for reliable marine operation.