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DCEC 4BTA3.9-GM65 Auxiliary Engine

DCEC 4BTA3.9-GM65 marine auxiliary engine is a 4-cylinders in line, 3.9 liters four-strokes engine with 102 mm bore and 120 mm stroke.

Equipped with BYC A fuel pump and GAC electronic governor, engine comes with turbocharger and Water-Air Intercooler.

The prime power for generator set 1800RPM of DCEC 4BTA3.9-GM65 marine auxiliary engine is 65kW.

DCEC provides both heat exchanger cooling and radiator cooling marine auxiliary engines, which mainly using for marine main generator and marine emergency generator.

For the emergency generator set applications, we provide additional options for customers such as dual starter motor system (we provide both electric and spring starter motor for customers), which are required by most of international classifications.

All of DCEC marine auxiliary engine are comes with dry type exhaust system, which means dry type exhaust manifold and dry type turbocharger, SeaMac provides upgrading services for water-cooled exhaust system, which modify dry type exhaust system into water-cooled exhaust system, which are quite important and often requested by passenger boat projects.

Advantages of 4BTA3.9-GM65 Auxiliary Engine

  • Advanced design and sophisticated manufacturing, adapt to various harsh working conditions, high strength, strong ability to work under heavy loads.

  • The cylinder block and cylinder head adopt integrated design to prevent the occurrence of engine water and oil leakage. The parts are about 40% less than other similar engines, and the failure rate is greatly reduced.

  • The cylinder bore adopts a platform mesh honing design, the perfect geometric structure effectively prevents oil leakage, and the use of advanced technologies such as new piston ring components and gasket crimping and molding reduces oil loss.

  • Adopt Holset supercharger with integral wastegate valve, low speed response and strong power.

  • The three-stage fuel filter ensures a balanced level of particle dispersion, protects the main components of the fuel system, and maximizes the life of the engine.

Technical Specifications

Engine Model:4BTA3.9-GM65
Engine Type:4 Cylinders
Displacement:3.9 L
Rated Speed:1800 RPM
Rated Power:87 BHP @ 1800 RPM
Peak Torque:219 g / kW.h @ 1800 RPM
Aspiration Method:Turbocharged & Water-Air Intercooler
Emission Standard:N / A
Bore*Storke:102 mm * 120 mm
Packing Size(L*W*H):N / A
Wet Weight:350 kg
Lead Time:15-30 Working Days
Payment Terms:T/T ,L/C

Coming Soon

Engine Model

Fuel Consumption

Rated Power

Fuel System


4BTA3.9-GM47214 g / kW.h @ 1500 RPM63 BHP @ 1500 RPMBYC A Pump / GAC 24 V Electronic GovernorTurbocharged & Water-Air Intercooler
4BTA3.9-GM65219 g / kW.h @ 1800 RPM87 BHP @ 1800 RPMBYC A Pump / GAC Electronic GovernorTurbocharged & Water-Air Intercooler

General Infomation of DCEC 4BTA3.9-GM65 Marine Auxiliary Engine

Engine Model4BTA3.9 – GM65Displacement3.9 L
Bore * Stroke102 mm * 120 mmAspirationTurbocharged & Water-Air Intercooler
Cylinders4 Cylinders, in LineFuel SystemBYC A / GAC Electronic Governor
Rated Power87 BHP (65 kW) @ 1800 RPMStandby Power96 BHP (72 kW) @ 1800 RPM
Dry Weight350 kgInstantaneous Inertia of Rotating Parts (Without Flywheel)0.143 kg·m2
Distance Between Center of Gravity and Rear End Face of Cylinder Block373 mmDistance From Center of Gravity to Center Line of Crankshaft (Above Crankshaft)163 mm
Low Idle Speed950 – 1050 RPMCompression Ratio17.3 : 1
Piston Speed7.2 m / secFiring Order1 – 3 – 4 – 2
Governor Regulation 5 %

Installation Data of DCEC 4BTA3.9-GM65 Marine Drive Engine

Maximum (Static) Bending Moment at Rear Face of Block1356 – N.m

Fuel System of DCEC 4BTA3.9-GM65 Marine Drive Engine

Maximum Fuel Flow of Oil PumpN / A
Maximum Oil Intake Resistance-Clean Fuel Filter63.5 mmHg
Maximum Oil Intake Resistance-Dirty Fuel Filter100 mmHg
Maximum Fuel Inlet Temperature60
Maximum Allowable Fuel Return to Tank FlowN / A
Maximum Allowable Return Line Pressure517 mmHg

Performance Curve DCEC Cummins 4BTA3.9-GM65 Marine Main Engine

System Technical Data of DCEC 4BTA3.9-GM65 Marine Auxiliary Engine

Exhaust SystemMaximum Exhaust Back Pressure76 mmHg
Exhaust Gas FlowN / A
Exhaust Gas Temperature510 ℃
Turbocharger Outlet Exhaust Temperature (Rated Power)N / A
Turbocharger Outlet Exhaust Temperature (Standby Power)N / A
Exhaust Heat Loss WorkN / A
Exhaust Pipe Diameter is Recommended75 mm
Maximum Allowable Instantaneous Bending Moment of Turbocharger Outlet FlangeN / A
Maximum Static Support Weight of Turbocharger Outlet FlangeN / A
Air Intake SystemMaximum Intake Air Restriction with Heavy Duty Air Cleaner—380 mmH2O
Clean Element
Maximum Intake Air Restriction with Heavy Duty Air Cleaner—635 mmH2O
Dirty Element  
Minimum Dirt Holding Capacity with Heavy Duty Air CleanerN / A
Maximum Temperature Rise from Ambient to the Inlet of the Turbocharger17 ℃
Maximum Pressure Drop from Supercharger Outlet to Intake Manifold75 mmHg
Intake Air FlowN / A
Heat Rejection to AmbientN / A
Intake Manifold PressureN / A
Minimum Ambient Temperature for Cold Starting-12 ℃
LubricationSystemNormal Operating Oil Pressure Range207 – 448 kPa
Maximum Sump Oil Temperature120 ℃
Low Idle – Minimum Main Channel PressureN / A
Rated Speed – Main Oil Channel Pressure (Min/Max)N / A
Oil Capacity when Using Bias Sump: Maximum -Minimum9.5 – 8.5 litre
Minimum Oil Pressure— At Low Idle69 kPa
Minimum Required Lube System Capacity – Sump Plus Filters10.9 litre
Sump Inclination Angle— Front Up20 °
Sump Inclination Angle— Front Down45 °
Sump Inclination Angle— Side to Side45 °
Sump Capacity – MinimumN / A
Sump Capacity – Highest LevelN / A
Cooling SystemCoolant Capacity – Engine Only.7.9 litre
Maximum External Engine Cooling Cycle Resistance28 kPa
Maximum Static Height of Coolant Above Crankshaft Centerline of Engin14 m
Thermostat Standard Regulating Temperature (Range)82 – 95 ℃
Minimum Pressure Cap Pressure69 kPa
Maximum Engine Coolant Temperature at Standby/Rated Power104 / 100
Cool Start SystemMinimum Recommended Battery Capacity – 18 ℃ Completely Cold, Only the Engine Cold Starting Current1375 CCA * 625 CCA
Minimum Recommended Battery Capacity – 18 ℃ Completely Cold, Only Engine Reserve CapacityN / A
Maximum Voltage Drop of Starting LoopN / A
Minimum Ambient Temperature without Auxiliary Cold Start-12 ℃
Minimum Starting Speed Required without Auxiliary Cold StartingN / A
Maximum Allowable Resistance of Starting Loop0.0012 hms * 0.004 hms

Scopes of Supply of DCEC 4BTA3.9-GM65 Marine Auxiliary Engine

Air Intake System1. Air Intake ManifoldExhuast System1. Exhuast Manifold
2. Air Filter2. Turbocharger
3. N / A3. Exhuast Elbow
Starting System1. Starter MotorCharging System1. Charging Alternator
2. Starter Rely2. N / A
Lubricating System1. Oil PumpFuel System1. Fuel Transfer Pump
2. Oil Filter2. High-Pressure Fuel Pump
3. N / A3. Machanical Governor
4. N / A4. Fuel Filter
Engine Shut-Down System1. Engine Fuel Shut-Off SolenoidPower Output System1. Flywheel
2. N / A2. Standard Flywheel Housing

Optional Accessories of DCEC 4BTA3.9-GM65 Marine Auxiliary Engine

Air Intake System1. Air Intake Pre-HeaterExhuast System1. Muffler & Bellows
2. Air Intake Pre-Filter2. Flame Trap
3. Air Filter Alarm System3. Spark Arrestor Type Muffler & Bellows
4. N / A4. DPF System
Fuel System1. Coarse FilterEngine Auiliary Accessories1. Hydraulic Oil Pump
2. Fuel Pre-Heater2. Hydraulic Cluch
Starting System1. Manual Magnetic DC ContactorCooling System1. Engine Monitor
2. Dual Ears Flywheel Housing2. Engine Protection System With Alarm System
3. Spring Starter Motor3. Machanical Engine Control Lever Syste
4. Air Starter Motor4. Electric Engine Control Lever System
5. Hydraulic Starter Motor5. N / A
6. Manual Magnetic DC Contactor6. N / A
Power Output System1. Gear Reduction GearboxCooling System1. Coolant Pre-Heater
2. Reverse Gear Box2. Jacket Water Heater
Lubricating System1. Oil Pre-HeaterEngine Mounting System1. Shock Absorber Pad


Committed to providing reliable premium propulsion system and power system for all kinds of ships around the world, SeaMac is a sub-brand of EMAC group that focused on maritime application.
SeaMac’s ranges of products mainly inclduing marine main engine, marine gearbox, marine propellers, marine control lever system, marine auxiliary engine, marine generator set and emergency generator set.
For more information of our marine proplusion and power system products, you are welcome to visit SeaMac homepage:

Modifiable components of DCEC 4BTA3.9-GM65 Marine Auxiliary  Engine

Air Intake System1. Installation Position of Air FilterStarting System1. 12V Starter Motor for 12V Electric System
2. Upgrade to Heavy-Duty Type Air Fitler2. Upgrading to Specified Brand and Speicifications of Starter Motor
Exhuast System1. Can Modify Installation Position and Direction of TurbochargerCharging System1. 12V Charging Alternator for 12V Electric System
2. Water-Cooled Exhuast Manifold2. Explosion-Proof Charging Alternator
3. Water-Cooled Turbocharger3. Upgrading to Specified Brand and Speicifications of Charging Alternator
Fuel System1. Upgrade to Fuel Fitler That Integrated with Fuel Transfer Pump and Fuel Pre-HearterEngine Auiliary Accessories1. Additional Auxiliary Systems Can Be Added for Special Applications
Engine Shut-Down System1. 12V Solenoid for 12V Electric SystemCooling System1. Can Modify Engine Into Keel Cooling System
2. Explosion-Proof Solenoid2. N / A
Lubricating System1. Oil Pan PositionPower Output System1. Can Modify Size of Flywheel Housing and Flywheel
2. Number of Dipstick2. Dual-Ear Flywheel Housing (For Twin-Starter System)
3. Position of Dipstick Can Choose from 6 Positions3. Some of Models Can Modify Flywheel Housing Into PTO Integrated Type
4. Can Modify Oil Filter to Be Remote Installation4. Engine Have Connecting Port of PTOs, That Able to Provide Power Output
Engine Mounting System1. Can Modify Engine Mouting Bracket

Note: All Above Data are Just for Reference, All Data Might Change Without Notices or Updates, Please Contact Our Sales Team to Confirm All Details Via WhatsApp or Email.

The picture of Sale Manual showing the accessories and scopes of supply.

Engine Sale Manual

The picture of Installation Drawing showing the accessories and scopes of supply.

Installation Drawing

The picture of Installation Manual showing the accessories and scopes of supply.

Installation Manual

The picture of Operation Manual showing the accessories and scopes of supply.

Operation Manual

The picture of Engine Parts Catalogue showing the accessories and scopes of supply.

Parts Catalogue

The picture of Test Report and Certifcate showing the accessories and scopes of supply.

Report & Certifcate

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