Details
Cummins KTA38-DM768 Marine Auxiliary Engine
Shipyards and fleet operators require absolute stability for their shipboard electrical grids. The Cummins KTA38-DM768 marine auxiliary engine is engineered specifically to meet this demand. Manufactured by CCEC (Chongqing Cummins Engine Co., Ltd), this 38-liter V12 diesel engine delivers a continuous 768kW (1030HP) output. HekoPower supplies this complete engine assembly to marine professionals worldwide, ensuring rapid vessel deployment and reliable continuous power.
Unlike propulsion engines, this specific KTA38-DM configuration is tuned exclusively for marine generator applications. It operates at a fixed 1800RPM, making it the ideal prime mover for heavy-duty 60Hz marine alternators.
Tech Specs of Cummins KTA38-DM768
General Engine Data
Engine Model: Cummins KTA38-DM768
Type: 12 Cylinders, V Type, 4 Stroke, Diesel
Displacement: 38 L
Bore * Stroke: 159 * 159
Net Weight (with flywheel & alternator): 4155 Kg
Overall Dimension: 2003mm*1362mm*1661mm
Engine Configuration No.: D233037MX02
Key Performance Data
Rated Power/Standby Power: 768 kW/1030HP, 847 kW/1135HP
Rated Speed: 1800 rpm
Low Idle Speed: 725-775 rpm
Fuel Consumption (Running Speed): 232 g/kW.hr
Torque/Rated Speed: 4074 N.m @ 1500 rpm
More Technical Data
Certification: CCS/IMO Certificates
Aspiration: Turbocharged/Aftercooled
Compression Radio: 15.5:1
Fuel System: Cummins Pressure Time (PT Pump)
Starting System: Electrical starting motor (24V)
Cooling Method: Water cooling
Cooling Method: Sea water pump, Heat exchanger, Wet exhaust manifold
Real-World Marine Application Scenarios
Marine auxiliary power is rarely one-size-fits-all. The KTA38-DM768 1800RPM generator application is specifically matched to vessels with high electrical load requirements.
On large cargo ships and bulk carriers, this engine frequently powers the primary ship service generators. It provides the necessary electrical backbone for massive winches, refrigeration systems, and navigational equipment. When the vessel is underway or maneuvering in port, the 768kW output ensures no voltage drops occur during heavy equipment startup.
For offshore vessels and large commercial fishing vessels, the KTA38-DM768 auxiliary engine offers exceptional load acceptance. Offshore platforms and supply vessels rely on this 12-cylinder marine diesel engine to maintain dynamic positioning systems. The turbocharged water-air intercooler engine design ensures rapid recovery when sudden electrical loads are demanded by thrusters.
Tugboats also utilize this engine as auxiliary power. While the main engines handle the towing, the KTA38-DM768 marine genset engine runs continuously in the background, powering fire-fighting pumps and crew habitation systems.
Technical Comparisons: Understanding the K38 Series
One of the most frequent questions we receive at HekoPower is how the KTA38-DM768 compares to other engines in the Cummins K38 family. Selecting the wrong configuration can lead to severe operational inefficiencies.
KTA38-DM768 vs KTA38-DM880
While both are 38L V12 diesel engines, their fueling and continuous load profiles differ. The KTA38-DM768 is rated for 768kW, whereas the DM880 pushes 880kW. Buyers often assume more power is always better. However, if your ship's alternator only requires a 750kW mechanical input, using the DM880 will result in underloading. Running a diesel engine continuously below its optimal load percentage causes carbon buildup and wet stacking. The DM768 offers a highly optimized fuel consumption curve at 1800RPM for 60Hz systems requiring exactly this power bracket, ultimately reducing thermal stress and extending the time between overhauls.
KTA38-DM768 vs KTA38-M / KTA38-M2
The "DM" designation stands for Diesel Marine auxiliary, while the "M" stands for Marine propulsion. You cannot use the KTA38-DM768 to drive a ship's propeller. The KTA38-M series features variable speed governors to adjust RPM based on throttle input. The KTA38-DM768 uses a strict constant-speed governor locked at 1800RPM to ensure the generator produces a stable 60Hz AC frequency. Attempting to use a DM engine for propulsion, or an M engine for stable power generation, will result in catastrophic system incompatibility.
Overcoming Common Technical Misconceptions
A prevalent misconception involves KTA38-DM768 50Hz marine generator compatibility. Because this engine generates 768kW at 1800RPM, it is intrinsically designed for 60Hz grids. While it is mechanically possible to lower the speed to 1500RPM for 50Hz output, the engine will not produce 768kW at that reduced speed. Output drops significantly as RPM decreases. Buyers needing 50Hz power should consult with our engineering team to select the appropriately rated 1500RPM Cummins K38 auxiliary model rather than simply adjusting the governor on the DM768.
Another misunderstanding concerns the KTA38-DM768 rated power vs standby power. Marine auxiliary engines are rated for continuous prime power duty. This means the 768kW output can be sustained 24 hours a day, 365 days a year, assuming standard maintenance intervals are met. There is no hidden "standby" surge capacity like you might find in land-based emergency generators. The engine is built for relentless, continuous operation at sea.
Marine environments are unforgiving. Proper maintenance of the KTA38-DM768 heat exchanger cooling system is critical. The seawater pump configuration draws corrosive saltwater to cool the internal freshwater jacket. Marine engineers must regularly inspect the sacrificial zinc anodes within the heat exchanger. Failing to replace these inexpensive anodes will result in galvanic corrosion destroying the expensive brass cooling tubes.
PT Fuel System Operation and Care
The KTA38-DM768 utilizes the classic Cummins PT (Pressure-Time) fuel system. Unlike modern common-rail electronics, the PT system is highly mechanical and incredibly robust against poor fuel quality. However, KTA38-DM PT fuel pump adjustment requires precision. If you experience hard starting causes, uneven cylinder performance, or excessive fuel consumption, the first step is checking the PT pump calibration and injector overhead clearances. HekoPower supplies both complete replacement PT pumps and genuine KTA38-DM768 injector maintenance kits.
Turbocharger and Exhaust Considerations
Monitoring the KTA38-DM768 wet exhaust system and turbochargers can predict future failures. High exhaust temperature or excessive black smoke usually points to air starvation. KTA38-DM768 turbocharger problems often stem from dirty air filters or exhaust gas leaks before the turbine housing. Keep the 159x159mm bore stroke engine breathing freely to maintain its impressive fuel consumption curve.
When it is time for a major service, sourcing parts is straightforward. As a dedicated KTA38-DM768 genuine engine supplier, HekoPower provides complete KTA38-DM768 overhaul kits. These include all necessary piston rings, main bearings, thrust washers, and upper/lower engine gasket sets to return your 768kW marine engine to factory specifications.
Marine Auxiliary Engine Series Overview
While the 768kW model is the perfect choice for specific 1800RPM/60Hz continuous loads, hull designs and alternator pairings vary wildly across the maritime industry. To ensure perfectly matched marine generator sizing, HekoPower supplies the complete range of CCEC K38 auxiliary engines. This allows naval architects and shipyards to select the precise horsepower and RPM required for their vessel's electrical grid.
Cummins K38-DM Series, Marine Auxilliary Diesel Engines for commercial and recreational applications, original products from Chongqing Cummins Engine Plant(CCEC). This series mainly includes KT38-DM560, KT38-DM679, KTA38-DM664, KTA38-DM768, KTA38-DM809, KTA38-DM814, KTA38-DM880, KTA38-DM1007. All engines complete with sea water pump, heat exchanger, CCS/IMO certificates.
Frequently Asked Questions Regarding the KTA38-DM768
Does the engine meet marine engine emission certifications?
Yes. The KTA38-DM series can be supplied with relevant classification society certificates, including CCS (China Classification Society) and IMO (International Maritime Organization) compliance documentation, ensuring legal operation in international waters.
How does HekoPower structure its KTA38-DM768 wholesale price for shipyard projects?
Our commercial pricing scales dynamically based on the project scope and total unit volume. For international shipyards managing multi-vessel builds, we provide comprehensive package rates that include the bare engine block, matching alternators, instrument panels, and initial maintenance parts kits. You can contact our sales engineering department directly to receive a formal commercial quotation tailored to your specific hull configuration.
Can this engine be directly coupled to a 50 Hz marine generator?
The standard KTA38-DM768 specification sheet optimizes performance at 1800 RPM for 60 Hz electrical output. If your vessel infrastructure relies on a 50 Hz grid, the engine requires a different governor calibration and fuel pump timing profile to run efficiently at 1500 RPM. For 50 Hz installations, we typically recommend evaluating alternative KTA38 models tuned explicitly by CCEC for lower-speed synchronization.
Can HekoPower supply replacement parts for older KTA38 marine auxiliary engines?
Absolutely. Beyond complete engines, we act as a comprehensive KTA38-DM768 parts supplier. Whether you need a replacement seawater pump, a 24V marine diesel engine starter, or a complete overhaul kit, we supply genuine replacement parts with rapid international shipping.
