Details
Genuine DCEC Cummins ISLe325-30 Complete Engine Assembly
The DCEC Cummins ISLe325-30 represents a heavily engineered 8.9-liter, inline six-cylinder diesel power plant developed for heavy-duty commercial vehicles, long-haul freight trucks, and regional passenger buses. Operating on the Euro III emissions standard, this engine combines a robust mechanical block design with an electronically controlled high-pressure common rail fuel system. Delivering a rated power output of 239 kW (325 horsepower) at 2100 rpm and a formidable peak torque of 1425 Nm between 1100 and 1400 rpm, the ISLe325-30 balances power density with operating economy.
As an international industrial engine supplier, HekoPower provides factory-tested, genuine Dongfeng Cummins (DCEC) ISLe325-30 complete engine assemblies. Every complete power pack leaves our warehouse fully equipped with the ECM governor, turbocharger, starter motor, alternator, fuel injection pump, and air compressor, allowing commercial fleet operators and repair facilities to execute seamless engine repowering and equipment replacement with minimal downtime.
Tech Specs of DCEC ISLe325-30
General Engine Data
Engine Model: Cummins ISLe325-30
Type: 6 Cylinders in Line
Displacement: 8.9 L
Bore * Stroke: 114 * 144.5
Net Weight (with flywheel & alternator): 706 Kg
Overall Dimension: 1147mm*767mm*1104mm
Key Performance Data
Rated Power: 239 kW/325 HP
Rated Speed: 2100 rpm
Idle Speed: 600-800 rpm
Fuel Consumption @ Rated Power: 210 g/Kw.h
Max Continuous Running Altitude: 4500 m
Torque/Rated Speed: 1080 N.m @ 2100 rpm
Max. Torque/Speed: 1350 N.m @ 1100-1500 rpm
Max. No-load Governed Speed: 2330 rpm
More Technical Data
Certification: Euro III
Aspiration: Turbocharged & Charge Air Cooled
Fuel System: Bosch Common rial (CCR)/ECM Governor
Compression Radio: 16.6:1
Starting System: Electrical Starting Motor 24V(750A)
Lowest Starting Temp Without auxiliary system: -12℃/-33℃
Cooling Method: Water cooled
Engine Cooling Fluid Volume: 11.1 L
Technical Comparisons Across the ISLe Engine Platform
Evaluating the ISLe325-30 against sibling models within the 8.9-liter Cummins engine family reveals critical structural, electronic, and operational distinctions necessary for proper fleet selection.
ISLe325-30 Euro III vs. ISLe325-40 Euro IV and ISLe325-50 Euro V
While all three variants share an identical 8.9-liter displacement, a 114 mm bore, and a 144 mm stroke, their emissions architecture and fuel quality tolerances differ significantly.
The ISLe325-30 utilizes a Bosch High-Pressure Common Rail (CCR) fuel system coupled with optimized internal combustion chambers to meet Euro III limits without requiring exhaust selective catalytic reduction (SCR) systems or Diesel Exhaust Fluid (DEF/AdBlue). This renders the Euro III configuration ideal for export markets in South America, Southeast Asia, Africa, and the Middle East where high-sulfur diesel fuel remains prevalent.
In contrast, the ISLe325-40 (Euro IV) and ISLe325-50 (Euro V) rely on downstream SCR urea injection and upgraded ECM wiring harnesses. Installing a Euro IV or Euro V unit into a Euro III vehicle chassis requires extensive electrical retrofitting and additional chassis space for DEF tanks, making the genuine ISLe325-30 the preferred direct replacement choice for Euro III vehicles.
ISLe325-30 vs. ISLe310-30, ISLe340-30, ISLe350-30, and ISLe375-30
Within the DCEC 8.9-liter Euro III series, engine ratings span from 310 HP up to 375 HP. The differences among these models extend beyond mere ECM software tuning:
ISLe310-30 vs ISLe325-30: The 310 HP variant delivers 1350 Nm of torque. Upgrading to the ISLe325-30 yields a 75 Nm torque gain, providing better gradeability for heavy payloads while utilizing identical mounting dimensions.
ISLe325-30 vs ISLe340-30 / ISLe350-30: The 340 HP (1425 Nm) and 350 HP (1500 Nm) engines feature reinforced piston crown profiles and altered turbocharger compressor wheels to withstand higher cylinder pressures.
ISLe325-30 vs ISLe375-30: The 375 HP model represents the upper thermal limit of the 8.9L block, generating 1550 Nm of torque. It requires enlarged cooling radiator capacity compared to the ISLe325-30.
Selecting the 325 HP rating strikes an optimal equilibrium between structural longevity, low fuel consumption, and moderate thermal loads on the vehicle's existing cooling package.
Real-World Commercial Application Scenarios
The DCEC ISLe325-30 is engineered for demanding commercial duty cycles where sustained torque at low engine speeds is essential.
Heavy-Duty Freight and Vocational Trucks
This engine serves as prime power for 20- to 40-ton commercial haulers, including 6x4 tractor units, 8x4 heavy dump trucks, and concrete mixer vehicles. Operating with a minimum full-load fuel consumption rate of approximately 210 g/kWh, the engine allows freight operators to maintain highway speeds while minimizing fuel overhead.
Regional Coaches and Intercity Transit Buses
The ISLe325-30 is widely integrated into 11-meter to 12-meter high-decker passenger coaches. The engine's compact power-to-weight ratio (dry weight approximately 725 kg) preserves vehicle payload capacity, while its low acoustic footprint enhances passenger comfort during continuous long-distance transit.
Equipment Repowering and Fleet Maintenance
For fleet managers operating aging commercial vehicles equipped with worn mechanical C-series engines, the complete ISLe325-30 power pack offers an efficient repowering solution. Replacing a high-hour engine with a factory-new DCEC assembly restores factory performance benchmarks and eliminates chronic oil consumption issues.
Maintenance, Diagnostics, and Replacement Guidance
Proper identification and routine preventative maintenance are vital to maximizing the service life of an 8.9-liter common rail engine.
Engine Data Plate and Serial Number Verification
Before ordering a replacement assembly, locate the metallic engine data plate attached to the rocker lever cover or the side of the front gear housing. The data plate contains critical identification details:
Engine Serial Number (ESN): An 8-digit unique numerical sequence used by DCEC to track exact bill-of-materials components.
Engine Model Designation: Confirm the exact code reads ISLe325 30.
CPO/SO Numbers: Shop Order codes indicating specific flywheel housing dimensions, oil pan configurations, and electrical pinouts.
Bosch CCR Fuel System Care
The high-pressure common rail system on the ISLe325-30 operates under extreme hydraulic pressures. Water contamination or solid particulate matter in the fuel supply will cause premature injector tip erosion and fuel pump wear. Always install fuel-water separators with primary 10-micron filtration and secondary 3-micron fine filtration.
Repowering Misconceptions to Avoid
Misconception 1: "All 8.9L Cummins engines use identical mounting points."
Fact: Flywheel housing options vary between SAE #1 and SAE #2 configurations depending on whether the original chassis was designed for a manual transmission or an automatic gearbox. Always verify housing bolt patterns prior to installation.
Misconception 2: "A 325HP engine can be re-calibrated to 375HP via ECM tuning alone."
Fact: Increasing fuel delivery without upgrading the corresponding turbocharger trim and piston cooling nozzles risks elevated exhaust gas temperatures (EGT) and premature head gasket failure.
Misconception 3: "Euro III common rail engines do not require electronic diagnostics."
Fact: The ISLe325-30 relies on an electronic control module (ECM) to regulate fuel rail pressure and injection timing. Diagnostic tools connecting via CAN bus are necessary for fault code retrieval and sensor monitoring.
DCEC ISLe Series Engine Portfolio
HekoPower provides comprehensive support for the full range of Dongfeng Cummins ISLe product lines, supporting international fleets with complete power solutions, technical documentation, and genuine replacement components tailored to your operational requirements.
DCEC ISDe Series, original products from Dongfeng Cummins Engine Plant (DCEC), Cummins Joint Venture Plant since 1986, 50% shareholding by Cummins USA. This series mainly includes ISLe270-30, ISLe290-30, ISLe300-30, ISLe310-30, ISLe325-30, ISLe340-30, ISLe350-30, ISLe375-30.
FAQ – Cummins ISLe325-30 Engine
How do I confirm if the ISLe325-30 is compatible with my existing transmission?
Check the flywheel housing size on your current engine (typically SAE 1 or SAE 2) and the flywheel tooth count. HekoPower configures the replacement assembly's rear housing and flywheel to match your existing clutch assembly or automatic transmission interface.
Why choose a genuine DCEC engine assembly over a local overhaul?
A factory-built DCEC assembly undergoes full dyno-testing to verify horsepower, torque curves, oil pressure, and seal integrity before export. Overhauling a worn block locally often runs the risk of hidden casting fractures, improper bearing clearances, and extended downtime.
What is the engine lifespan?
With proper maintenance, it offers long-term durability and stable performance.
