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6BT5.9-M120 Marine Engine

DCEC 6BT5.9-M120 marine main engine is a 6-cylinders in line, 5.9 liters four-strokes engine with 102 mm bore and 120 mm stroke.

Equipped with Weifu AD fuel pump and RSV governor, engine comes with turbocharger.

The prime power at 2200 RPM of DCEC 6BT5.9-M120 marine main engine is 120 HP.

Based on standard DCEC marine main engines, SeaMac provides both heat exchanger cooling and keel cooling marine main engines, we also provide complete propulsion system that including marine engine, gearbox, shaft, propeller as complete power system. SeaMac provides full life cycle services for all our customers, from design to power system supply, from installation to commissioning, from after-sales service training to spare parts supply, from trouble shooting to overhaul technical support.

All of DCEC marine main 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 6BT5.9-M120 Marine Engine

  • Leading design and excellent manufacturing technology make the engine more reliable and durable, suitable for high-strength, heavy-duty work under severe working conditions.

  • 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.

  • Synchronized with the advanced design and sophisticated manufacturing of CMS in the United States, it is suitable for harsh working conditions and has strong high-intensity and heavy-duty operating capabilities.

Technical Specifications

Engine Model:6BT5.9-M120
Engine Type:6 Cylinders, in Line
Displacement:5.9 L
Rated Speed:2200 RPM
Rated Power / Speed:120 HP @ 2200 RPM
Peak Torque:430 N.m @ 1600 RPM
Classification:N/A
Aspiration Method:Turbocharged
Emission Standard:N / A
Bore * stroke:102 mm * 120 mm
Packing Size(L * W * H):1020 mm * 601 mm * 1201 mm
Wet Weight:432 kg
Lead Time:15-30 Working Days
Payment Terms:T/T ,L/C

Coming Soon

Coming Soon

Engine Model

Peak Torque

Rated Power

Fuel System

Aspiration

6BT5.9-M120430 N.m @ 1600 RPM120 Hp @ 2200 RPM Weifu AD Pump / RSV Mechanical GovernorTurbocharged
6BTA5.9-M150616 N.m @ 1400 RPM150 Hp @ 2200 RPM Weifu AD Pump / RSV Mechanical GovernorTurbocharged & Water-Air Intercooler
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General Infomation of DCEC 6BT5.9-M120 Marine Main Engine

Engine Model6BT5.9 – M120Displacement5.9 L
Bore * Stroke102 mm * 120 mmAspirationTurbocharged
Cylinders6 Cylinders, in LineSpeed Control8 %
Fuel SystemWeifu AD Pump / RSV Mechanical GovernorRated Power120 HP @ 2200 RPM
Peak Torque430 N.m @ 1600 RPMCPL Code834 – 02
Dry Weight432 kg

Installation Data of DCEC 6BT5.9-M120 Marine Main Engine

Moment of Inertia of Rotating Components0.25 kg·m²
Center of Gravity from Front Face of BlockTBD
Center of Gravity Above Crankshaft Centerline140 mm
Maximum (Static) Bending Moment at Front Support Mounting Surface435 N.m
Maximum (Static) Bending Moment at Side Pad Mounting SurfaceTBD
Maximum (Static) Bending Moment at Rear Face of Block1356 N.m
Moment of Inertia of Complete Engine – Roll Axis16.5 kg.m²
Moment of Inertia of Complete Engine – Pitch Axis41.1 kg.m²
Maximum (Static) Bending Moment at Rear Face of Block35.4 kg.m²

Fuel System of DCEC 6BT5.9-M120 Marine Main Engine

Maximum Fuel Flow on the Supply Side of the Fuel Pump190 litre / hr
Maximum Fuel Intake Restriction – with Clean Fuel Filter102 mmHg
Maximum Fuel Intake Restriction – with Dirty Fuel Filter203 mmHg
Maximum Fuel Drain Restriction – with Check ValvesN / A
Maximum Fuel Drain Restriction – less Check Valves510 mmHg
Maximum Fuel Inlet Temperature71
Minimum Fuel Tank Air Venting Capability Required at 6 in. H2O Back Pressure340 litre / hr
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Performance Curve-DCEC Cummins 6BT5.9-M120 Marine Drive Engine

System Technical Data of DCEC 6BT5.9-M120 Marine Main Engine

Exhaust SystemMaximum Back Pressure76 mmHg
Exhaust Pipe Size Normally Acceptable75 mm
Maximum Static Supported Weight at the Turbocharger Outlet Flange13.5 kg
Exhaust Manifold Insulation AcceptableN / A
Turbocharger Insulation AcceptableN / A
Air Intake SystemMaximum Intake Air Restriction with Heavy Duty Air Cleaner – Clean Element381 mmH2O
Maximum Intake Air Restriction with Heavy Duty Air Cleaner – Dirty Element635 mmH2O
Minimum Dirt Holding Capacity with Heavy Duty Air Cleaner53 g / litre / sec
Maximum Temperature Rise from Ambient to the Inlet of the Turbocharger17
Maximum Pressure Drop from the Turbocharger Outlet to the Intake ManifoldTBD
LubricationSystemNormal Operating Oil Pressure Range200 – 450 kPa
Maximum Lube Oil Flow for Engine Accessories4 litre / min.
Maximum Sump Oil Temperature121
Minimum Engine Protection Oil Pressure – At Rated Speed and Load276 kPa
Minimum Engine Protection Oil Pressure – At Torque Peak Speed and Load207 kPa
Minimum Engine Oil Pressure for Engine Protection Devices – At Low Idle69 kPa
Minimum Required Lube System Capacity – Sump plus Filters16.3 litre
By-Pass Filtration RequiredN / A
Angularity of Standard Oil Pan – Front Down35 °
Angularity of Standard Oil Pan – Front Up35 °
Angularity of Standard Oil Pan – Side to Side35 °
Cool Start SystemMinimum Battery Capacity(Below – 18 )12 V ; 24 V
Minimum Battery Capacity(Below – 18 ) – Engine Cold Starting Current950 CCA ; 475 CCA
Minimum Battery Capacity(Below – 18 ) – Engine Reserve Capacity260 * 130 min
Minimum Environmental Temperature When Cold Start Unassisted– 12
Minimum Engine Speed When Cold Start Unassisted125 rpm
Cooling SystemCoolant Capacity – Engine Only9.9 litre
Maximum Engine Cooling Circuit External Resistance34 kPa
Maximum Sump Oil TemperatureTBD
Minimum Engine Protection Oil Pressure-At Rated Speed and LoadTBD
Standard (Modulating) Thermostat Range82 – 93
Maximum Block Coolant Pressure with Closed Thermostat and No Pressure Cap276 kPa
Minimum Pressure Cap50 kPa
Maximum Engine Coolant Temperature at Engine Outlet100
Maximum Engine Coolant Temperature for Engine Protection Devices101.6
Minimum Engine Coolant Temperature71
Minimum Fill Rate19 litre / min
Maximum Initial Fill Time5 min
Minimum Coolant Expansion Space of System Capacity6 %
Maximum Deaeration Time25 min.
Minimum Drawdown of Total System Capacity11 %
Fan-On Engine Coolant Outlet Temperature93
Fan-On Engine Coolant Outlet Temperature85
Shutter Opening Intake Manifold Air TemperatureN / A
——END——

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.

What's the Standard Scopes of Supply?

With full ranges of emission standard from Euro 2 to Euro 7, Dongfeng Cummins producing 12 series marine engines, started from 3.9 liter engine, to 15 liter engine, covering the power range of 125HP to 650HP.
Dongfeng Cummins marine engine customize developing configurations for big vehicle OEMs in China, based on each of requirement, Dongfeng Cummins producing dozens of different configuration engines with same engine model number, which only SO-Shop Order will be different with each other, the SO number is the identify number of the engine configuration of each model.
Even with same engine model, different SO number engine can have very different configuration with each other, with different prices. Some of SO-Shop Order is not available for commercial market, such as restricted models (Usually for military specifications).
EMAC offering most common, cost effective models which also able to process the production in Dongfeng Cummins, which usually have following accessories as standard configuration.

Scopes of Supply of DCEC Marine Engine

Air Intake System1. Air Intake Manifold        Exhuast System1. Exhuast Manifold
2. Air Filter2. Turbocharger
3. N / A3. Exhuast Elbow
Starting System1. Starter Motor        Charging System1. Charging Alternator
2. Starter Rely2. N / A
Lubricating System1. Oil Pump        Fuel 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 Solenoid        Power Output System1. Flywheel
2. N / A2. Standard Flywheel Housing
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What's the Available Optional Items?

Dongfeng Cummins only provides customize service for the large quantity orders or large OEMs, which means usually the order quantity are higher than 1000 units. For the small quantity engine project, EMAC provides customize services with our own resource and engineer team.
EMAC have rich experience on the customize developing, which provides abundant optional items based on the requirement of each project. The typical optional items are special Prestolite charging alternator, prestolite starter motor, Knorr Air compressor. Valeo air conditioning compressor, ECU output socket set, engine accelerate pedal etc.

Optional Accessories of DCEC DCEC marine 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
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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: www.seamac.com

What's the Modifiable Items and Scopes?

As explained in the standard scopes of supply, Dongfeng Cummins not able to provide customize developing for small quantity projects or small OEMs, so EMAC helps SME OEMs to provide customize services, not only providing additional optional items, but also provides customize modification services to meet their requirements based on the exisiting engine SO number.
As flexible service ability is our core advantages, EMAC is very experienced and good at providing customize services, the common customize services are as below:
1: AIr Intake System: Change the air intake direction.
2: Air Exhuast System: We are able to change the turbocharger direction as the interaction on installation could be occured, also change change the air exhuast direction.
3: Lubricating System: Modify lubricating system is one of the most common requirement from customer, we can provide flat-type engine oil pan, to lower down total engine height, which usually required for special vehicles. For the standard engine oil pan, we also can change the direction of the engine oil pan.
4: Cooling System: There are lots of options for the engine cooling system, for the engine fan, we can provide customize for the material of engine fan (plastic fan or steel fan), wind direction of the engine fan (blower fan or suction fan ) and types of engine fan (mechanical fan or electric control fan).
5: Power Output System: Most of electronic controlled Dongfeng Cummins marine engines are comes with SAE#1 flywheel housing now, while lots of customers need SAE#2 flywheel because of the housing of transmissio is SAE#2, so we have to provide customzie services for those customer, which need to modify flywheel housing, flywheel and starter motor, we also have PTO integrated type flywheel housing available, which can output the whole power of the engine from the PTO on the flywheel housing, we can also provide modification of the mounting side of the starter motor.
6: Electric System: All of Dongfeng Cummins engines are comes with standard 24V electric system, while some customer need to modify the electric system into 12V, we can also modify the starter motor and alternator into appointed brand or appointed specifications.
EMAC is your reliable professional power system partner, feel free to contact our services team to get detailed information about our standard scopes of supply, optional items and modifiable parts for our Dongfeng Cummins marine engine, we are ready to explore the journey of our cooperation.

How to Order Engine to Replace Your Old Engine?

There are three types of engine replacements demand, type A is to replace the old Dongfeng Cummins engine, the original engine is produced by Dongfeng Cummins, type B is to replace Cummins engine produced in other countries including UK, USA, Mexico, India or Japan Komatsu Cummins, type C is to replace other brands engine or even gasoline engines with Dongfeng Cummins produced engines. The detailed introduction and replacement process are as below:
Type A: Engine Replacement Requirement (Original Engine is Dongfeng Cummins Engine).
This is most simple demand case, you just need to provide us the original engine name plate, and then we can easily check and confirm what exactly you need, and we also ensuring that the engine from us will be 100% same with your original engine. (In some case that the vehicle manufacturing modify the engine on their own, we are not able to supply the parts or the condition that modified by the vehicle manufacturer)
Type B: Engine Replacement Requirement (Original Engine is Cummins Engine but produced in UK, USA or other Cummins engine plant).
EMAC have rich experiences in replace the UK, USA or other engine plant produced engine, with Dongfeng Cummins produced Cummins engines, we required the original engine name plate photo to obtain the related information (at least we will need engine serial number, with engine model name only is useless for us, we are not able to provide quotation with engine model name only for the replacement project), and then we can check out the BOM list and all accessories of your original engine serial number, and then we can check and compare with the BOM list of our Dongfeng Cummins produced engine, choose the most closest SO number engine, and modify the parts that not same with your original engine, we have delivered hundreds of cases of replace the customer's original engine that produced in Cummins UK, USA or other engine plants with Dongfeng Cummins produced engines, you can refer to our video introduction on Youtube: https://youtu.be/dYVgRM5NsUo
We can NOT guarantee the engine produced by Dongfeng Cummins is exactly same with your original engine, but we can guarantee that all of engines from EMAC will have no problem with installtion and performance, which all of engines can works very well after replacement.
Type C: Engine Replacement Requirement (Original Engine is other brnad engines even gasoline engines).
EMAC also have rich experiences in replace the engine that not Cummins installed, these engines can be other brands such as Deutz, Caterpillar, Perkins, Komatsu or others, we even had experiences of replace gasoline engine with Dongfeng Cummins produced diesel engines.
This kind of appliaction is more complex and quite risky, EMAC can't do much thing due to lacking of information, the only thing we can guarantee is the performance after replacement, we check and compare the engine performance curve of original engine and our Dongfeng Cummins engine, and then we select the most suitable model for replacement. Due to we are lacking of the installation spaces and related accessories, we will send the both CAD and 3D drawing for our recommend engine model, and then customer have to evaluate the risky of replace the original engine with our engine, especially the risky of space, the possibile interactive when installation, and the risky of modify related coolant pipe, air pipes and wiring harness. Normally this kind of request consuming lots of energy and resource for us to carry on, also quite risky for us, so we will not work on the replacement quantity that below 50 units.
When your requirement is replacement, please tell our customer service team of what type of replacement you need, and provide us original engine name plate, the engine name plate is the necessary material before we start our business negotiations, we will NOT reply to all inquiry that even can't provide engine name plate.

How to Choose the Right Dongfeng Cummins Marine Engine for You?

To choose a suitable engine for truck, bus or special vehicle manufacturer is quite simple, because the buyer is the manufacturer, so usually they are quite flexible with space, pipes and wiring connections.
The following process are the standard process for us to select a suitable engine model for truck, bus or special vehicle manufacturer demand.
Step 1: We need basic information of the required engine, including rated power, rated speed and emission standard of the required engine.
Step 2: EMAC will evaluate the requirement and select the suitable engine model for customer, with engine data sheet, engine performance curve, CAD darwing, 3D model and budgetary quotation provided back to customer.
Step 3: Customer should check and compare the engine data sheet, performance curve and related drawing and confirm all details one by one. Most important thing is confirm the performance curve suitable for the requirement.
Step 4: After engine confirmed, we have to check and confirm the specifications of accessories one by one carefully, like the electric system specifications (12V or 24V), the detailed specifications of starter motor, charging alternator, air compressor, power steering pump, A/C compressor etc.
Step 5: Confirming the accessories positions and connections, customer need to check and confirm all positions are suitable for the project, such as engine fan, turbocharger, oil pan position, and connections of air pipe, coolant pipe, wiring harness etc.
Step 6: After confirming the engine performance, position, connection and specifications of all accessories, we will be able to provide accurate quotation for prototype and batch order. Prototype is strongly recommend to start the cooperation, to avoid the possible problem, risky on the engine with batch order.
Notes:
1: Technical support including technical training, onsite installation and commissioning services are avaiable with additional chargers.
2: We are able to supply complete powertrain system, including engine, transmission, transfer, axle, suspension etc, engine with transmission is highly recommended, because if we supply both engine and transmission, we can run simulations for the vehicle, which we usually will provide customer a simulation report, with the simulated result of Balanced Maximum Vehilce Speed and Maximum Grade Ability at different speed.
3: EMAC able supply complete chassis that integrate all powertrain system together, which can greatly reduce the manufacturer's design works and reduce the system mismatching risky.

Tips of Dongfeng Cummins Marine Engines!

Dongfeng Cummins is one of 50:50 joint venture of Cummins in China, its official Cummins factory that following high Cummins USA production and quality control standard, the Dongfeng Cummins factory swap every 5 years between appointed employee from Dongfeng Motor and Cummins. For more details, you can refer to the company introduction of DCEC-Dongfeng Cummins Engine Company.


Started the production of Cummins engines in China in 1980s, Cummins products has been in China for over 40 years, thousands of people have worked for Cummins China and some of them are very skilled experienced engineer, some of them resigned from Cummins to set up their own small workshops or assembly factories that focusing on producing copy Cummins engines.

Price is always not the problem for Chinese suppliers, there are many tickies to lower down the engine prices, such as supply self-rebuild engine as new engine, supply official RECON engine from Cummins as brand new engine, assembly the fake engine with after-market parts, supply lower power model engine and change the name plate etc. You can find plenty of suppliers on alibaxx.com with various prices, the classic Chinese business style is tell you that he give you very low price and not make profit, how can you believe a businessman will make business that have no profit? They gave you low price not becuase they share their profit to you?
As a matter of fact, Chinese supplier often make their profit much more higher by selling the low quality copy products as genuine brand new products! Always remember YOU GET WHAT YOU PAID!
The key point of dealing with Chinese supplier, is to find and choose reliable business partner that will not cheat you for short-term business, but with vision of build long-term career and life-time partnership, EMAC is one of the reliable partner that not chasing for short-term high profit, but we cares our decades of good reputation and we working with all business partners not as supplier and customers, but as close friend and brothers.

FAQ of Dongfeng Cummins Marine Engines?

1: What mean by DCEC?
DCEC is the short name of Dongfeng Cummins Engine Company, take the first letter of each word, it comes with DCEC as short name, for more details about DCEC, you can refer to the company introduction of DCEC-Dongfeng Cummins Engine Company.

2: Does your engines copy products?
This question is quite often from customer that not familiar with Cummins, Cummins have over 20 joint ventures in China now, and 6 of them are engine joint venture, which Cummins owns 50% share of all of those 6 engine plants, so all of the Cummins factories in China are genuine Cummins factory, that following high Cummins USA production and quality control standard. EMAC is the business partner of DCEC, and we are supplying powertrain and engine power pack based on genuine brand new engines from Dongfeng Cummins for all different applications, EMAC is a reliable and professional power system solution provider that offering abundant various options.
3: Why there are so many companies selling Cummins engines?
There are plenty of companies selling Cummins engines in China, especially on the B2B platform, such as alibaxx.com, you can find plenty suppliers there with attractive prices, Cummins products has been in China for over 40 years, thousands of people have worked for Cummins China and some of them are very skilled experienced engineer, some of them resigned from Cummins to set up their own small workshops or assembly factories that focusing on producing copy Cummins engines. You should be careful of being cheated by the attractive prices with copy or rebuild products.
4: How can I identify if the engine genuine or not?
Cummins keep working on the updating its identification system, technically, there are serial number on all key components of Dongfeng Cummins engines, including cylinder block, cylinder head, turbochager, fuel pump, starter motor, alternator, you can collecting the serial number (NOT part number), and then call DCEC call service center to identify if all the numbers are matching to the original number or not. EMAC continuously updating the latest Cummins identification system, you are welcome to following our website or keep in touch with our customer services team to get latest information from Cummins.
5: What's the warranty policy for the engines supplied by EMAC?
EMAC following standard Dongfeng Cummins warranty policy, which will update sometimes, you can following us to get the latest warranty policy from Dongfeng Cummins. Generally EMAC only afford the defective parts cots and shipping costs for the warranty claims, labor costs and transportation costs are not covered in the warranty.
However, EMAC is building our own independant after-sales service system now, which aims to build a global service network, with resouces of global repair and engineering network, which we believe can bring all business partner benifit in future, helping all of OEM manufacturers expanding their market into global market without worries of lacking after-sales service network. For more details about our Global Service, you can visiting www.global-service.com.
6: How about the future parts supply for the engines? Are you able to supply parts?
As the support team of EMAC's business scope, PartMac is our own brand that focusing on genuine parts directly from all brand factories.
All of EMAC’s partners are facing big challenges with sourcing original spare parts in China. Committed to providing truthworthy and professional after-sales support and parts supply, PartMac is a sub-brand of EMAC group that focusing on parts business. Stick to original parts only, PartMac can’t give any solution on CHEAP PARTS, but you don’t need to worry about any quality issues with every single parts from PartMac.
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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