DCEC Cummins QSB6.7-G3 Generator Drive Engine

What Is the Cummins QSB6.7-G3?

The DCEC Cummins QSB6.7-G3 is a heavy-duty, four-stroke, inline 6-cylinder diesel engine purpose-built for generator drive applications. With a 6.7-liter displacement, 107mm bore, and 124mm stroke, this engine is optimized to deliver consistent 151kW of prime power at 1500 RPM, making it the right fit for 50Hz generator sets used in industrial, commercial, and standby power installations.

Equipped with a BOSCH Electronically Controlled High-Pressure Common Rail (HPCR) fuel injection system, paired with a turbocharger and Air-Air intercooler, the QSB6.7-G3 delivers precise fuel metering under all load conditions, resulting in lower fuel consumption, cleaner combustion, and longer service intervals compared to mechanically governed alternatives.

Manufactured by Dongfeng Cummins Engine Co., Ltd. (DCEC), a joint venture with over 30 years of production history, the QSB6.7-G3 meets EU Stage IIIA and China NS III emission standards and carries a factory warranty of 1 year or 1,500 operating hours, whichever comes first.

QSB6.7-G3 Technical Specifications

What These Specifications Mean for Your Generator Set

BOSCH Common Rail vs. Mechanical Injection

Unlike older mechanically governed engines, the QSB6.7-G3's BOSCH Common Rail system maintains injection pressure independently of engine speed. This means your generator set holds stable output voltage and frequency even during sudden load changes, critical for sensitive equipment in hospitals, data centers, and telecom sites.

17.3:1 Compression Ratio

A high compression ratio of 17.3:1 drives superior thermal efficiency, enabling more complete combustion with less fuel. For operators running 24/7 standby or prime power applications, this directly translates into lower fuel costs over the engine's service life.

Governor Regulation ≤ 3%

A governor regulation of ≤3% meets the ISO 8528-5 standard for generator set voltage and frequency stability. This is the benchmark required by most industrial end-users and grid-parallel applications worldwide.

Air-Air Intercooler Advantage

The Air-Air intercooler (vs. water-air on some variants) reduces intake air temperature more efficiently, delivering denser air charge to the combustion chamber. The result: higher power density, reduced exhaust temperatures, and longer turbocharger life.

-25°C Cold Start Capability

With an auxiliary cold-start system, the QSB6.7-G3 starts reliably down to -25°C — making it suitable for deployments in Northern Europe, Central Asia, Canada, and high-altitude cold environments where competing engines fail to start.

Which QSB6.7 Engine Is Right for You?

The QSB6.7 family spans four generator drive variants. Here's a clear comparison to help you select the right configuration for your genset project:

→  Need 150kVA class output with EU emission compliance?

 The QSB6.7-G3 is your match.

→ Need slightly more headroom for 165kVA gensets?

 Step up to the QSB6.7-G4.

→ Running projects in emission-flexible regions and need maximum output from the 6.7L platform?

 The QSB6.7-G31 at 209kW prime delivers the most power this displacement can offer.

Application Scenarios

Industrial & Manufacturing

The QSB6.7-G3's ≤3% governor regulation and electronic fuel control make it the preferred choice for factory backup power systems, where motor loads and sudden demand spikes require an engine that responds instantly without frequency droop.

Hospitals & Critical Infrastructure

EU Stage IIIA compliance and 12V/24V electric start ensure the QSB6.7-G3 meets the stringent emission and response-time requirements of healthcare facilities, emergency service buildings, and critical infrastructure sites.

Telecom & Data Centers

Stable output across variable loads, combined with a proven 1,500-hour service interval, minimizes maintenance downtime, essential for telecom base stations and edge data centers operating in remote or infrastructure-limited locations.

Construction & Rental Fleet

Compact dimensions (1150×810×910mm), 520kg net weight, and robust cold-start capability down to -25°C make the QSB6.7-G3 well-suited for rental genset fleets deployed across varied climates and job site conditions.

FAQ

Q1: What generator set size does the QSB6.7-G3 support?

A: The QSB6.7-G3 delivers 151kW prime power, making it the ideal drive engine for 150kVA – 200kVA generator sets at 1500 RPM (50Hz). Its standby rating of 166kW provides additional headroom for peak demand scenarios.

Q2: What is the difference between QSB6.7-G3 and QSB6.7-G4?

A: Both use the same BOSCH Common Rail fuel system and Air-Air intercooler configuration. The key difference is power output: the G3 produces 151kW prime / 166kW standby, while the G4 produces 168kW prime / 185kW standby. Choose the G4 if your genset application requires a larger output class without changing the fuel system architecture.

Q3: What emission standards does the QSB6.7-G3 meet?

A: The QSB6.7-G3 is certified to EU Stage IIIA and China National Standard III (NS III). This makes it compliant for deployment in the European Union, the UK, Australia, and most regulated markets in Southeast Asia and the Middle East.

Q4: What is the difference between BOSCH Common Rail and Electronically Controlled HPCR?

A: BOSCH Common Rail (used in G3 and G4) is a proven, widely-serviceable system with excellent parts availability globally. Electronically Controlled HPCR (used in G31 and G32) offers higher injection pressure capability, enabling the engine to achieve greater power density , which is why the G31 reaches 209kW from the same 6.7L block. For most standard genset applications, the BOSCH Common Rail system offers a better balance of performance, serviceability, and total cost of ownership.

Q5: Can the QSB6.7-G3 start in cold weather conditions?

A: Yes. The QSB6.7-G3 starts reliably at -10°C as standard. With the optional auxiliary cold-start system installed, cold-start capability extends to -25°C, suitable for deployment in Scandinavia, Canada, Russia, and high-altitude mountain regions.

Q6: What is the warranty on the Cummins QSB6.7-G3?

A: The QSB6.7-G3 comes with a standard factory warranty of 1 year or 1,500 operating hours, whichever comes first, from the date of commissioning.

Q7: What are the available trade terms and lead time?

A: We offer FOB, CIF, and CNF from Shenzhen port. Standard lead time is 15-30 working days. Payment is accepted via T/T (bank transfer) and L/C (letter of credit). Sea and air freight both available.

Ordering & Shipping Information

WARRANTY: 1 Year or 1,500 Operating Hours
LEAD TIME: 15-30 Working Days (depend on stock)
PORT OF EXPORT: Shenzhen, China
TRADE TERMS: FOB / CIF / CNF
PAYMENT TERMS: T/T (Bank Transfer) | L/C (Letter of Credit)
TRANSPORT: Sea Freight (standard) | Air Freight (available)
PACKING SIZE: 1450mm × 1110mm × 1210mm
GROSS WEIGHT: 580 kg

Ready to Power Your Next Generator Set Project?

Whether you're sourcing a single engine or planning a large-volume OEM order, our team provides competitive FOB pricing, full documentation support (CO, test report, packing list), and direct factory coordination with DCEC Cummins.Lead time: 15-30 working days from order confirmation.Stock availability subject to current inventory — contact us now to confirm.

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