Details
DCEC Cummins B5.9-195G Natural Gas Engine Assembly (145kW / 195HP)
The DCEC Cummins B5.9-195G is a dedicated 5.9-liter, 6-cylinder in-line natural gas engine designed for commercial vehicle power packs and specialized industrial machinery. Built by Dongfeng Cummins Engine Co., Ltd. (DCEC) in Xiangyang, China, this unit delivers a rated output of 145 kW (195 HP) at 2800 RPM and a peak torque rating of 569 N.m at 1600 RPM. Engineered on the robust Cummins B-Series block, it combines low-emission gas combustion with heavy-duty structural reliability.
As a global engine supplier and exporter, HekoPower provides complete, factory-new Dongfeng Cummins industrial engine assemblies directly to fleet operators, equipment rebuilders, and generator assemblers. We supply genuine complete units packaged for international maritime freight, complete with full technical documentation, verified factory serial numbers, and ongoing spare parts support.
Tech Specs of Cummins B5.9-195G
General Engine Data
Engine Model: Cummins B5.9-195G
Type: 6 Cylinders in Line
Displacement: 5.9 L
Bore * Stroke: 102 * 120
Net Weight (with flywheel & alternator): 413 Kg
Overall Dimension: 1026mm*699mm*912mm
Key Performance Data
Rated Power: 145 kW/195 HP
Rated Speed: 2800 rpm
Governed Speed: 2500 rpm
Max Torque/Speed: 569 N.m @ 1600 rpm
Fuel Consumption @ Rated Power: 239 g/Kw.h
Torque Available @ Clutch Engagement: 386 N.m
Max. Altitude for Continuous Opera: 2600 m
Torque/rated Speed: 496 N.m @ 2500 rpm
More Technical Data
Certification: Euro II
Aspiration: Turbocharged & Air-Air Intercooled
Fuel System: Cummins Fuel System
Compression Radio: 10.5:1
Starting System: Electrical Starting Motor 24V(510A)
Lowest Starting Temp Without auxiliary system: -10℃/-25℃
Cooling Method: Water cooled
Engine Cooling Fluid Volume: 12.3 L
Technical Comparisons: Gas vs. Diesel & Vehicle vs. Generator Drive
Selecting the correct 5.9L Cummins engine assembly requires understanding the mechanical differences between gaseous and liquid fuel platforms, as well as variable-speed versus fixed-speed governing systems.
B5.9-195G Natural Gas Engine vs. Standard Diesel B-Series
While sharing identical cylinder bore (102 mm) and stroke (120 mm) dimensions with diesel variants like the 6BT5.9, the DCEC B5.9-195G natural gas engine uses modified internal metallurgy. Gaseous combustion creates elevated dry thermal stresses in the upper cylinder. To withstand this heat, the B5.9-195G features stellite-faced intake and exhaust valves, induction-hardened valve seats, and specialized cylinder heads fitted with spark plug wells instead of fuel injector bores.
In addition, the 10.5:1 compression ratio prevents pre-ignition knocking under gaseous fuel loads. Attempting to convert a 17.5:1 compression diesel block to natural gas by swapping external lines causes severe detonation. Sourcing a dedicated factory gas engine assembly ensures long component service life and correct valvetrain wear characteristics.
Commercial Vehicle Power Pack vs. Genset Engine Applications
Buyers often evaluate the Cummins B5.9-195G generator engine for prime power generator sets or standby generators. The core 5.9L block is widely utilized across Cummins genset engine lines, but the vehicle-spec B5.9-195G employs a variable-speed automotive governor designed for dynamic acceleration between 800 and 2800 RPM.
For industrial power generation or remote power applications requiring fixed 1500 RPM (50 Hz) or 1800 RPM (60 Hz) output, the B5.9-195G can be deployed as a gas drive unit. However, the governor and gas mixer must be calibrated to maintain tight frequency control under sudden electrical load shifts.
Output Profile: B5.9-195G vs. Lower-Output B5.9-150G
The B5.9-195G offers a 45 horsepower increase over the lower-rated B5.9-150G variant. This increased output is achieved through modified turbocharger compressor wheel profiles and recalibrated fuel metering within the gas mixer. The 195HP rating enables heavier gross vehicle weights (GVW) to maintain cruising speeds on steep gradients without overheating the turbocharger turbine housing.
Real-World Application Scenarios
The Dongfeng Cummins B5.9-195G natural gas engine serves specific commercial applications where compressed natural gas (CNG) or liquefied natural gas (LNG) infrastructure provides lower fuel expenses than diesel.
Commercial Vehicle Fleets and Transit Buses
In urban bus fleets, Dongfeng trucks, box vans, and municipal utility vehicles, the B5.9-195G delivers quiet operation and low particulate emissions meeting Euro II standards. Its peak torque of 569 N.m at 1600 RPM provides responsive acceleration across urban stop-and-go driving routes.
Industrial Power Generation & Remote Power Stations
In off-grid industrial power generation, oilfield pumping stations, and remote agricultural sites where natural gas or wellhead gas is available, the B5.9-195G serves as a reliable prime mover. Utilizing field-gas supplies lowers fuel transport costs and eliminates fuel storage risks associated with remote diesel tanks.
Cummins B5.9-195G Maintenance Schedule & Service Guidelines
Consistent service routines protect combustion components and maintain fuel efficiency on spark-ignited gas platforms.
Ignition System Care
Inspect spark plug gaps every 250 operating hours. Gaseous combustion demands higher arc voltages than gasoline engines, increasing stress on ignition coils and high-tension leads. Replace spark plugs with manufacturer-approved thermal range gas plugs to prevent misfires under full load.
Valvetrain Adjustment
Because natural gas lacks the lubricating qualities of liquid fuel, valve seat recession must be checked regularly. Measure cold valve lash (0.30 mm intake, 0.61 mm exhaust) every 1000 hours. Proper clearance prevents valve holding, which causes hot exhaust gas to erode the valve faces.
Engine Oil Selection
Never use standard high-ash diesel engine oil in a B5.9-195G engine. Standard diesel oils contain sulfated ash additives that create metallic deposits on spark plugs and valve crowns under high gas combustion temperatures. Always specify low-ash or ashless natural gas engine oil.
Common Misconceptions Regarding the B5.9-195G Engine
Misconception 1: Searching for a "DCEC B5.9-195G Diesel Engine"
Procurement requests frequently search for a "B5.9-195G diesel engine" or "Cummins B5.9G diesel engine." The "G" suffix in Cummins engine nomenclature explicitly designates Gas (CNG/LNG) fuel operation. If your machinery requires a pure diesel 5.9L engine, the mechanical 6BT5.9 or electronic ISBe/QSB5.9 series must be selected instead.
Misconception 2: Expecting a "195kW Cummins Generator Engine"
Another common point of confusion is mistaking advertised engine horsepower for generator electrical output. In DCEC automotive naming conventions, "195G" signifies 195 Horsepower (145 kW) mechanical output at the flywheel. It does not represent a 195 kW electrical generator set.
Misconception 3: "Mechanical Fuel Injection System" Compatibility
Buyers often assume all B-Series engines utilize mechanical fuel injection pumps. The B5.9-195G replaces diesel injection pumps with a low-pressure gas mixer, electronic ignition module, and gas pressure regulator. It does not contain high-pressure fuel pumps or diesel fuel injectors.
Genuine DCEC Engine Sourcing & Export Support from HekoPower
When purchasing a genuine Dongfeng Cummins B5.9-195G engine replacement, verifying factory authenticity protects your fleet from substandard counterfeit parts. HekoPower supplies original DCEC engines directly from China, backed by factory dataplates and global serial number verification.
Each complete engine assembly is shipped in export-grade, reinforced wooden crates (1200 mm x 900 mm x 1100 mm) with an approximate gross shipping weight of 480 kg. We offer competitive engine price options, technical support, and comprehensive spare parts supply for international engine dealers and fleet maintenance centers.
DCEC Gas Engine Series, original products from Dongfeng Cummins Engine Plant (DCEC), Cummins Joint Venture Plant since 1986, 50% shareholding by Cummins USA. This series mainly includes B5.9-150G, BGe 150-30, B5.9-195G, BGe 195-31, BGe 200-30, B5.9-230G, BGe 230-31.
Frequently Asked Questions (FAQ)
What is the exact power rating of the Cummins B5.9-195G engine?
The engine produces a rated output of 145 kW (195 HP) at 2800 RPM and a maximum torque of 569 N.m at 1600 RPM.
Is the B5.9-195G engine compatible with both CNG and LNG fuel?
Yes. The engine fuel induction system operates on both Compressed Natural Gas (CNG) and Liquefied Natural Gas (LNG), provided the primary regulator supplies fuel at the specified system pressure.
What components are included with a complete B5.9-195G engine assembly?
A complete assembly includes the short block, cylinder head, turbocharger, air-to-air intercooler pipe connectors, gas mixer, ignition harness, 24V starter motor, charging alternator, and flywheel assembly.
How does HekoPower verify original Dongfeng Cummins production?
Every engine carries a stamped DCEC engine dataplate featuring a unique factory serial number. This number can be verified through Cummins official service networks before shipment.
