Cummins 6BT5.9-M120 Diesel Engine 120HP Marine Diesel Engine
Cummins 6BT5.9-M120 6-cylinder in-line diesel engine rated 98 kW (120 HP) at 2200 rpm with 5.9 L displacement for propulsion and auxiliary duty on workboats, fishing vessels, tugs and barges.
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What This Engine Is Built For
The Cummins 6BT5.9-M120 is a 6-cylinder in-line marine diesel engine of 5.9 L with a 102 * 120 mm bore and stroke supplied by MEP Power as a complete assembly. It is rated at 98 kW (120 HP) at 2200 rpm and develops 430 N.m @ 1600 rpm. The engine is turbocharged, with a Wuxi Weifu AD Pump/RSV Governor fuel system. It is built at the Dongfeng Cummins Plant 6BT5.9-M120 and carries CCS Certificates. Typical duty is propulsion and auxiliary duty on workboats, fishing vessels, tugs and barges; dry weight with flywheel and alternator is 432 Kg and the overall envelope is 1100mm*750mm*988mm.
Key Benefits
- Delivers 98 kW (120 HP) at 2200 rpm from 5.9 L as a factory-rated assembly.
- Peak torque of 430 N.m @ 1600 rpm holds the load without downshifting or derating.
- Turbocharged induction keeps charge temperature under control in continuous duty.
- Supplied to CCS Certificates, so the unit can be registered in markets that require it.
- Dry weight 432 Kg and envelope 1100mm*750mm*988mm are published so the installation can be checked before ordering.
- Published fuel consumption of ≤263 g/kW.hr 6BT5.9-M120 makes running cost predictable.
Application Scenarios
- Main propulsion in a steel workboat
- Auxiliary and deck machinery drive
- Fishing vessel repower
- Harbour tug and pilot boat service
Who It Is For
- Shipyards repowering workboats and fishing vessels
- Boat owners replacing a worn main engine without changing the engine bed
- Marine service yards that keep exchange engines on the shelf
- Fleet operators standardising on one Cummins family across several hulls
Problems It Solves
- A vessel out of service earns nothing, and a mismatched replacement engine means new mounts, new couplings and weeks of yard time.
- Marine duty punishes engines that were never cooled for sea water service.
- Spare parts for grey-import engines are hard to identify years later.
- Identifying the right 6BT5.9-M120 variant from a serial number takes experience; MEP Power checks the configuration before quoting.
Specification As Published
Values below are the published data for this unit. Where a figure is not listed it was not stated by the source data sheet; ask and we will confirm before you order.
| Model | Cummins 6BT5.9-M120 |
| Type | 6 Cylinders in Line |
| Displacement | 5.9 L |
| Bore x Stroke | 102 * 120 |
| Net Weight (with flywheel and alternator) | 432 Kg |
| Overall Dimension | 1100mm*750mm*988mm |
| Manufacturing Plant | Dongfeng Cummins Plant 6BT5.9-M120 |
| Rated Power/Speed | 98 kW/120HP |
| Rated Speed | 2200 rpm |
| Max Torque/Speed | 430 N.m @ 1600 rpm |
| Torque/Rated Speed | 391 N.m @ 2200 rpm |
| Low Idle Speed | 750±100 rpm |
| Fuel Consumption (running speed) | ≤263 g/kW.hr 6BT5.9-M120 |
| Certification | CCS Certificates |
| Aspiration | Turbocharged |
| Fuel System | Wuxi Weifu AD Pump/RSV Governor |
| Starting System | Electrical Start (12V/24V) |
| Governor Type | Mechanical Control |
| Lowest Starting Temp (without auxiliary system) | -12℃ |
| Engine Cooling Fluid Volume | 9.9 L |
Technical Features
- Cylinders: 6 Cylinders in Line
- Displacement: 5.9 L
- Bore and stroke: 102 * 120
- Aspiration: Turbocharged
- Fuel system: Wuxi Weifu AD Pump/RSV Governor
- Governor: Mechanical Control
- Starting system: Electrical Start (12V/24V)
- Coolant capacity: 9.9 L
Quality Control
- Every engine is inspected by the MEP Power inspection team before it leaves the warehouse
- Engine, configuration and serial numbers are recorded and photographed for the buyer
- Genuine and OEM units are quoted separately so the buyer knows exactly what is supplied
- Warranty on genuine and OEM new engines and generator sets is one year or 1000 hours, whichever comes first; parts and repair labour are covered for quality faults inside that period.
Use and Installation Guide
- Quote the model 6BT5.9-M120 when ordering so the correct variant is supplied.
- Check the gearbox reduction ratio and propeller match before ordering
- Confirm raw-water or keel cooling to suit the hull
- Commission with the exhaust system and sea water pump connected as supplied
- Keep the warranty terms in mind: one year or 1000 hours, whichever comes first.
Customisation Options
- OEM and ODM builds, including your logo and company name on the unit
- Cummins engine customisation and modification to your requirement
- Mining and special explosion-proof builds
- Genuine or OEM parts specified on the quotation
How It Compares
| Compared with | What to consider |
|---|---|
| A rebuilt or used engine of the same rating | A rebuilt unit may show the same 98 kW (120 HP) on paper, but its running history is unknown and the warranty rarely covers the whole engine. |
| A larger engine in the same 6BT5.9 range | Moving up a frame size adds weight, envelope and fuel burn; specify the next size up only if the duty cycle really needs the headroom. |
| A non-Cummins engine of similar output | Parts and service for Cummins families are available in most markets, which matters more over ten years than the purchase price on day one. |
6BT5.9-M120 Questions
Is this 6BT5.9-M120 a genuine Cummins engine
What power does the 6BT5.9-M120 produce
What warranty comes with the engine
How do I confirm this is the right variant for my machine
How is the engine shipped and what payment terms apply
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Quote The 6BT5.9-M120
Send your serial number or nameplate photograph and we will confirm the configuration, then price genuine and OEM options side by side.