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Genuine Cummins 6BT5.9-GM100 Marine Auxiliary Engine | 100kW Prime Power
When outfitting a commercial vessel, the reliability of your onboard electrical grid is just as critical as your main propulsion. A sudden loss of hotel load or winch power can paralyze a ship. HekoPower is a leading factory direct Cummins marine diesel engine distributor, providing heavy-duty power solutions for rigorous offshore applications.
Our flagship model in this power node is the DCEC Cummins 6BT5.9-GM100. Designed specifically as a marine diesel engine for continuous prime power, this unit delivers a stable 100kW (134HP) to drive standard 50Hz or 60Hz marine alternators. If you are a shipyard engineer sizing a new build or a fleet manager looking for a replacement marine generator engine 100kW 134HP package, the Cummins B5.9-GM series engine platform offers unmatched durability and global parts availability.
Tech Specs of Cummins 6BT5.9-GM100
General Engine Data
Engine Model: Cummins 6BT5.9-GM100
Type: 6 Cylinders in Line
Displacement: 5.9 L
Bore * Stroke: 102 * 120
Net Weight (with flywheel & alternator): 426 Kg
Overall Dimension: 867mm*544mm*988mm
Engine Configuration No.: D402051MX02
Key Performance Data
Rated Power/Standby Power: 100 kW/134HP, 110 kW/174HP
Rated Speed: 1800 rpm
Low Idle Speed: 1000±50 rpm
Fuel Consumption (Running Speed): ≤ 240 g/kW.hr
More Technical Data
Certification: CCS Certificates
Aspiration: Turbocharged
Fuel System: BYC A Pump/GAC Governor
Compression Ratio: 17.3:1
Electrical System (Starter Motor/Alternator): 12V/24V
Lowest Starting Temp Without auxiliary system: -12℃
Cooling Method: Water cooled
Engine Cooling Fluid Volume: 9.9 L
Ignition Order: 1-5-3-6-2-4
Fuel Efficiency and Governor Performance
Fuel efficiency directly impacts a vessel's operating margins. The 100kW Cummins 6BT5.9-GM100 fuel consumption at 1800 RPM is highly competitive, rated at approximately 217 to 240 g/kW.hr depending on the load profile. This translates to roughly 26 liters per hour at maximum continuous rating.
To maintain steady voltage during sudden load shifts, this marine genset engine with GAC governor responds instantly to electrical demands. Paired with the reliable BYC A-Series mechanical fuel pump, the system guarantees that RPM fluctuations remain strictly within ±3%. This precise frequency control makes this Cummins marine engine compatible with Stamford alternator models and other premium marine-grade electrical ends.
Cummins 6BT5.9-GM100 Cooling System and Heat Exchanger Options
Managing engine temperatures in an enclosed engine room requires marine-specific hardware. We offer several Cummins 6BT5.9-GM100 cooling system and heat exchanger options tailored to your hull design. The standard configuration for this Cummins marine engine with heat exchanger cooling features a heavy-duty cupronickel core that utilizes raw seawater to cool the closed-loop freshwater jacket.
For vessels operating in shallow, muddy waters where raw water intakes frequently clog, we can supply this Cummins 5.9L auxiliary engine for ship generator applications configured for keel cooling. This completely isolates the engine from raw seawater, drastically extending the life of the block.
Real Application Scenarios for the 100kW Marine Generator Engine
The versatility of the Dongfeng Cummins marine diesel engine line makes it suitable for a wide variety of hull types and operational profiles. HekoPower provides Cummins marine engine bulk supply for shipyards building multiple vessels, ensuring standardized power across entire fleets.
Workboats and Fishing Fleets
Heavy deck machinery requires robust, uninterrupted power. The Cummins marine engine for fishing vessel generator applications easily handles the shock loads of engaging massive hydraulic winches or running industrial refrigeration plants. Similarly, we frequently supply this exact model as a Cummins marine diesel engine for harbor service boats and tugs, where the engine must idle for hours and then immediately throttle up to maximum output without stumbling.
Passenger Transport and Patrol
When safety is the primary concern, redundancy is mandatory. The DCEC 6BT5.9-GM100 engine with CCS/IMO certification meets the strict maritime classification standards required for passenger transport. It serves flawlessly as a Cummins auxiliary engine for passenger ferry operations, powering climate control, navigation, and galley systems.
Naval architects also specify this turbocharged marine generator drive engine as a reliable marine genset engine for coastal patrol vessel operations. In larger offshore installations, it is frequently utilized as a dedicated marine emergency generator diesel engine, mounted on upper decks with radiator cooling to guarantee power if the main engine room floods.
Technical Comparison with Other Marine Auxiliary Engines
Compared with larger marine auxiliary engines such as the Cummins 6CTA or N855 series, the 6BT5.9-GM100 offers lower fuel consumption and easier maintenance access.
For medium-duty marine generator systems, many vessel operators prefer the 5.9L platform because:
- spare parts are widely available,
- maintenance procedures are simpler,
- and operating costs remain manageable.
Compared with some high-speed lightweight marine engines, the Cummins 6BT5.9 marine auxiliary engine is often selected for its durability and stable long-term operation.
The engine is particularly suitable for vessels requiring continuous prime power rather than short intermittent operation.
Maintenance and Replacement Tips for the Cummins B5.9-GM Series
Minimizing downtime is the primary goal of any chief engineer. Keeping your Cummins 6BT5.9 marine auxiliary engine running smoothly requires strict adherence to maintenance protocols.
First, monitor the sacrificial zinc anodes located inside the heat exchanger. These zincs are designed to corrode safely in salt water, protecting the expensive cupronickel tubes. Inspect them monthly and replace them when they are 50% depleted. Neglecting these anodes is the fastest way to ruin a marine engine.
Second, fuel filtration is critical. While the mechanical fuel pump on the Cummins 6BT5.9-GM100 1800RPM marine diesel engine is exceptionally tough, water in the diesel will destroy the injector tips. Install high-quality dual primary fuel filters with water separators, and drain the bowls daily.
Finally, maintain the valve lash. Running continuously at 1800 RPM causes gradual wear on the valvetrain. Checking and adjusting the valve clearances every 1,000 operating hours will maintain optimal fuel economy and prevent exhaust valve burning.
Partnering with an OEM Cummins Marine Engine Supplier in China
Finding a reliable supplier who understands marine certification is difficult. The market often obscures the origin of engine blocks. As a genuine Cummins marine engine supplier, HekoPower ships original equipment directly from the Dongfeng Cummins (DCEC) joint venture facility.
Whether you need a single 100kW marine auxiliary engine for offshore vessel refitting or you are seeking a wholesale Cummins 6BT5.9-GM100 engine distributor for ongoing Cummins marine engine for shipyard projects, we provide complete transparency. Every engine leaves our facility with rigorous factory testing reports and proper classification paperwork. We are an established genuine DCEC marine engine exporter, handling international logistics, customs clearance, and long-term parts support.
Cummins B5.9-GM Series, Marine Auxilliary Diesel Engines for commercial and recreational applications, original products from Dongfeng Cummins Engine Plant (DCEC), Cummins Joint Venture Plant since 1986, 50% shareholding by Cummins USA. This series mainly includes 6BT5.9-GM83, 6BT5.9-GM100, 6BTA5.9-GM100, 6BTAA5.9-GM115, 6BTA5.9-GM120. All engines complete with sea water pump, heat exchanger, CCS/IMO certificates.
Frequently Asked Questions
Where can I find the full Cummins 6BT5.9 marine auxiliary engine technical specifications?
The core performance data, including dimensional drawings, weight (426 kg dry), and fluid capacities, are listed in the tables at the top of this page. For detailed CAD installation files or specific torsional vibration data, please contact our engineering team directly.
Is there a genuine Cummins 6BT5.9-GM100 marine auxiliary diesel engine for sale and in stock?
Yes. As a primary marine auxiliary diesel engine manufacturer and distributor, HekoPower maintains a rolling inventory of the Cummins 6BT5.9-GM100. Standard lead times range from 7 to 15 business days depending on specific cooling configurations and class certification requirements.
Can I purchase this engine as a complete marine genset engine package?
Absolutely. While many clients purchase the bare marine diesel engine for generator set replacement, we also build complete power packs. We can mate the engine to your preferred alternator brand, mount it on a marine-grade skid with vibration isolators, and pre-wire the control panels.
How do I get pricing for the Cummins 5.9L marine auxiliary engine?
Because shipping logistics, classification certificates (CCS/IMO), and optional accessories vary widely by project, we provide customized quotes. Contact HekoPower today with your vessel details, and our sales team will quickly provide an accurate, highly competitive price.
Can the engine be matched with Stamford alternators?
Yes. The engine is commonly configured with Stamford, Leroy Somer and Marathon marine alternators.
What cooling systems are available?
Most marine projects use heat exchanger cooling systems to improve corrosion resistance and operational reliability in seawater environments.
Does HekoPower supply spare parts for the engine?
HekoPower can support customers with spare parts supply, maintenance components and technical assistance for marine generator engine projects.
