Cummins Marine 4BTA3.9-GM65

The Cummins 4BTA3.9-GM65 marine auxiliary engine is a 4-cylinder, in-line, 3.9-liter four-stroke engine with a 102mm bore and 120mm stroke. It is equipped with a BYC A fuel pump and GAC electronic governor, along with a turbocharger and Water-Air Intercooler. The prime power for the generator set at 1800RPM is 65kW.

Cummins 4BTA3.9-GM65 offers both heat exchanger and radiator cooling options for marine auxiliary engines, primarily used for marine main generators and marine emergency generators. For emergency generator set applications, additional options are available for customers such as a dual starter motor system, providing both electric and spring starter motors, which are required by most international classifications.

All Cummins marine auxiliary engines come with a dry-type exhaust system, including a dry-type exhaust manifold and turbocharger. we provide upgrading services for water-cooled exhaust systems and modifying dry-type exhaust systems into water-cooled ones, which are important and often requested for passenger boat projects.

Advantages of the 4BTA3.9-GM65 Auxiliary Engine:

1. Advanced Design and Manufacturing: The engine benefits from advanced design and sophisticated manufacturing, making it adaptable to various harsh working conditions with high strength and the ability to endure heavy loads.
2. Integrated Cylinder Block and Cylinder Head Design: The engine features an integrated cylinder block and cylinder head design to prevent engine water and oil leakage. This integration reduces the number of parts by approximately 40% compared to similar engines, resulting in a significantly reduced failure rate.
3. Platform Mesh Honing Cylinder Bore Design: The cylinder bore adopts a platform mesh honing design with a perfect geometric structure to effectively prevent oil leakage. Additionally, advanced technologies such as new piston ring components and gasket crimping and molding further reduce oil loss.
4. Holset Supercharger with Integral Wastegate Valve: The engine is equipped with a Holset supercharger with an integral wastegate valve, providing low-speed response and strong power output.
5. Three-Stage Fuel Filter: A three-stage fuel filter ensures a balanced level of particle dispersion, protecting the main components of the fuel system and maximizing the engine’s lifespan.

Cummins 4BTA3.9-GM65 – General Information

Model: 4BTA3.9-GM65

Type: 4 Cylinders in Line

Displacement: 3.9 L

Bore * Stroke: 102 * 120

Net Weight (with flywheel & alternator): 350 Kg

Overall Dimension: 867mm*544mm*988mm

Engine Configuration No.: L383060MX02

Manufacture Plant: Dongfeng Cummins Plant

Cummins 4BTA3.9-GM65 – specification

Certification: CCS Certificates

Aspiration: Turbocharged/Water-air Intercooled

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℃

Engine Cooling Fluid Volume: 7.9 L

Cooling Method: Water Cooled

Cummins 4BTA3.9-GM65 – Performance Data

Rated Power/Speed: 65 kW/87HP @ 1800 rpm

Standby Power: 72 kW/96HP @ 1800 rpm

Low Idle Speed: 950-1050 rpm

Fuel Consumption (Running Speed): ≤ 240 g/kW.hr

Cummins Engine Seires