DCEC Cummins 6L8.9 Construction Machinery Engine — 240 to 360 HP Heavy-Duty Diesel
The DCEC Cummins 6L8.9 is an 8.9-liter, 6-cylinder inline heavy-duty diesel engine engineered for the most demanding construction applications. Built by the Dongfeng Cummins Engine Company (DCEC), this engine delivers 240 to 360 HP with peak torque up to 1,400 N·m, powering large excavators, bulldozers, cranes, road rollers and other heavy construction equipment across mining, quarrying and infrastructure projects worldwide.
With 14 models spanning turbocharged and turbocharged air-intercooled configurations, the 6L8.9 platform delivers the high torque and rugged durability that heavy construction machinery demands, while maintaining fuel efficiency and low operating costs.
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Request a Quote →Key Specifications
- Engine Type
- 6-Cylinder, Inline, 4-Stroke Diesel
- Displacement
- 8.9 L (543 cu in)
- Bore × Stroke
- 114 mm × 145 mm
- Power Range
- 240 – 360 HP @ 1,850 – 2,200 RPM
- Peak Torque
- 777 – 1,400 N·m @ 1,000 – 2,200 RPM
- Aspiration
- Turbocharged / Turbocharged Air-Intercooled
- Fuel System
- Direct Injection
- Cooling System
- Liquid-Cooled
- Dry Weight
- 1,150 kg
- Packing Size
- 1,220 × 960 × 1,150 mm
All 6L8.9-C Construction Machinery Engine Models
The 6L8.9-C series includes 14 models across two aspiration types. Each model is available as a complete engine unit or spare parts. Click any model for full technical data.
Turbocharged Air-Intercooled (6LTAA8.9-C)
| Model | Rated Power | Peak Torque | Speed |
|---|---|---|---|
| 6LTAA8.9-C360 | 360 HP | 1,400 N·m | 2,200 RPM |
| 6LTAA8.9-C340 | 340 HP | 1,380 N·m | 2,200 RPM |
| 6LTAA8.9-C325 | 325 HP | 1,230 N·m | 2,200 RPM |
| 6LTAA8.9-C300 | 300 HP | 1,268 N·m | 2,000 RPM |
| 6LTAA8.9-C295 | 295 HP | 1,000 N·m | 2,100 RPM |
| 6LTAA8.9-C290 | 290 HP | 980 N·m | 2,100 RPM |
| 6LTAA8.9-C280 | 280 HP | 910 N·m | 2,200 RPM |
| 6LTAA8.9-C275-II | 275 HP | 980 N·m | 2,000 RPM |
| 6LTAA8.9-C260 | 260 HP | 842 N·m | 2,200 RPM |
| 6LTAA8.9-C240-I | 240 HP | 1,180 N·m | 2,200 RPM |
| 6LTAA8.9-C240-II | 240 HP | 777 N·m | 2,200 RPM |
| 6LTAA8.9-C220 | 220 HP | 950 N·m | 2,200 RPM |
| 6LTAA8.9-C180-I | 180 HP | 840 N·m | 2,200 RPM |
| 6LTAA8.9-C178 | 178 HP | 803 N·m | 1,850 RPM |
Why Choose the 6L8.9 for Heavy Construction Machinery?
Massive Torque for Heavy-Duty Work
Heavy construction equipment needs enormous pulling power. The 6L8.9 delivers up to 1,400 N·m of peak torque, providing exceptional breakout force for large excavators, blade-pushing power for bulldozers, and reliable lifting capacity for cranes — even under sustained heavy loads.
Holset Turbocharger with Wastegate
The integrated Holset turbocharger ensures excellent low-speed response and consistent power delivery, even under heavy loads and at high altitudes. The wastegate design optimizes boost pressure across the entire RPM range, improving both responsiveness and fuel efficiency.
Fewer Parts, Greater Reliability
The L-series design philosophy prioritizes simplicity — fewer moving parts means fewer potential failure points. This translates to higher uptime, longer service intervals, and lower total cost of ownership across the engine’s service life.
Advanced Fuel Injection System
The direct injection system with rotary fuel pump delivers precise fuel metering for optimal combustion. The result is higher combustion efficiency, lower emissions, and the ability to adapt to various fuel qualities found in different markets worldwide.
Built for Harsh Environments
Construction sites are dusty, hot, and punishing. The 6L8.9’s heavy-duty cylinder liners, reinforced block structure, and robust cooling system are engineered to withstand continuous operation in the most demanding conditions — from desert quarries to tropical mining operations.
6L8.9 vs. Competing Construction Engines
| Parameter | Cummins 6L8.9-C | Yuchai YC6J | Weichai WP6 | Deutz TCD2013 |
|---|---|---|---|---|
| Displacement | 8.9 L | 6.5 L | 6.75 L | 4.04 L |
| Power Range | 240 – 360 HP | 180 – 240 HP | 190 – 280 HP | 130 – 220 HP |
| Peak Torque | Up to 1,400 N·m | Up to 900 N·m | Up to 1,000 N·m | Up to 800 N·m |
| Cylinder Count | 6 | 6 | 6 | 4 |
| Global Parts Network | ✅ Extensive | Limited | Regional | Regional |
| Warranty Support | Cummins Global | Regional | Regional | Regional |
The 6L8.9 offers the highest power and torque output in its class, backed by Cummins’ global parts and service network — a critical advantage for export equipment and multi-country fleet operations.
Typical Applications
- Large Excavators — 20–50 ton class machines requiring maximum breakout torque
- Bulldozers — Medium to large dozers (D6–D8 class) for heavy earthmoving
- Mobile Cranes — All-terrain and truck cranes up to 100+ ton capacity
- Road Rollers — Heavy vibratory compactors for highway construction
- Wheel Loaders — 3–5 m³ bucket capacity loaders for quarry and aggregate work
- Drilling Rigs — Rotary and DTH drilling rigs for foundation and mining
- Concrete Pump Sets — Large truck-mounted and stationary concrete pumps
- Engine Power Packs — Standalone power units for heavy stationary equipment
Maintenance Cost & Service Intervals
| Maintenance Item | Interval | Estimated Cost (USD) |
|---|---|---|
| Engine Oil & Filter Change | Every 250 hours | $50 – $80 |
| Fuel Filter Replacement | Every 500 hours | $25 – $40 |
| Air Filter Cleaning/Replacement | Every 500 / 1,000 hours | $30 – $60 |
| Valve Lash Adjustment | Every 1,500 hours | $60 – $100 |
| Coolant Replacement | Every 2,000 hours | $40 – $70 |
| Turbocharger Inspection | Every 3,000 hours | $80 – $150 |
| Overhaul (Major) | 12,000 – 15,000 hours | $1,500 – $3,000 |
Annual maintenance cost for a typical 6L8.9 running 2,000 hours per year is approximately $500 – $800, significantly lower than comparable European engines. Cummins parts are available in over 190 countries, minimizing downtime on job sites.
6L8.9-C vs. QSC8.3 vs. QSL8.9 — Which One to Choose?
| Feature | 6L8.9-C (Construction) | QSC8.3 (Industrial) | QSL8.9 (Industrial) |
|---|---|---|---|
| Primary Use | Heavy construction machinery | General industrial / skid steer | Heavy industrial / genset |
| Displacement | 8.9 L | 8.3 L | 8.9 L |
| Power Range | 178 – 360 HP | 215 – 260 HP | 220 – 360 HP |
| Torque Focus | Maximum low-RPM torque | Balanced torque-speed | High steady-state power |
| Durability | Reinforced for heavy-duty | Standard industrial | Standard industrial |
Choose 6L8.9-C for heavy construction equipment needing maximum torque and rugged durability. Choose QSC8.3 for lighter industrial applications. Choose QSL8.9 for high-power industrial or generator set applications.
Get Your 6L8.9 Engine Quote
Tell us your equipment model and power requirement — we’ll match the right 6L8.9 variant within 12 hours.
Contact BLSH Diesel →Related Cummins Engine Series
Looking for a different power range or application? Explore the full DCEC Cummins family:
- B5.9 Construction — 5.9L, 115-205 HP for medium construction equipment
- B3.9 Construction — 3.9L, 80-130 HP for compact construction machinery
- QSB6.7 Industrial — 6.7L, 130-260 HP, versatile mid-range engine
- QSC8.3 Industrial — 8.3L, 215-260 HP for industrial applications
- QSL8.9 Industrial — 8.9L, 220-360 HP for heavy industrial use
- QSZ13 Industrial — 13L, 380-500 HP for the most demanding applications
Official Resources
- Cummins Genuine Parts Catalog — Order OEM parts by engine serial number
Frequently Asked Questions
What is the difference between 6L8.9-C and QSL8.9?
Both share the same 8.9L displacement, but the 6L8.9-C is purpose-built for construction machinery with reinforced components, higher low-RPM torque, and heavy-duty cooling for harsh job site conditions. The QSL8.9 is optimized for industrial power generation and stationary equipment with a focus on steady-state efficiency and emissions compliance.
What is the fuel consumption of the 6L8.9 at rated power?
At rated power (e.g., 340 HP), the 6L8.9 typically consumes approximately 65–75 liters per hour under full load. Actual consumption varies based on load factor, ambient conditions, and specific application. Partial load operation significantly reduces fuel consumption.
Can the 6L8.9 operate at high altitudes?
Yes. With the Holset turbocharger and wastegate, the 6L8.9 can operate at altitudes up to 3,000 meters with acceptable power deration. For operations above 3,000 meters, consult BLSH for high-altitude configuration options.
Does BLSH supply spare parts for 6L8.9 engines?
Yes. We supply complete engine assemblies, replacement short blocks, long blocks, turbochargers, fuel injection pumps, filters, and all wear parts. As an authorized channel, we provide genuine Cummins components with full traceability for all 6L8.9 models.
What is the expected service life of a 6L8.9 construction engine?
With proper maintenance following the recommended service schedule, the 6L8.9 achieves 12,000 – 15,000 hours before major overhaul. Many installations in mining and heavy construction applications exceed 18,000 hours with diligent oil analysis and timely component replacement.
What is the minimum order quantity?
For complete engines, MOQ is 1 unit. For spare parts and components, we accommodate flexible quantities. Contact us with your requirements for a detailed quotation including shipping to your destination port.
