Cummins QSB5.9-G2 G-Drive Diesel Engine (96 kW @ 1500 RPM)

The QSB5.9-G2 belongs to Cummins' QSB (Quantum System B) engine family, a platform originally developed for demanding commercial vehicle and industrial applications. The G-Drive variant — denoted by the "G" designation — is specifically configured for stationary generator set use, with calibration, governor settings, and component selection optimized for continuous-duty power generation rather than variable-load vehicle operation.

The QSB5.9-G2 is one of five variants in the QSB5.9 generator drive series, positioned as the entry-level output option within the family at 96kW prime power. It is manufactured by Dongfeng Cummins Engine Co., Ltd. (DCEC), a joint venture between Dongfeng Motor Corporation and Cummins Inc., established in 1986 and operating under Cummins' global quality standards.

Engine Configuration Explained

The "TAA" configuration of the QSB5.9-G2 refers to:

T   — Turbocharged: a turbocharger forces additional air into the combustion chamber, increasing power output relative to the engine's displacement.

AA  — Air-Air Intercooler: compressed air from the turbocharger passes through an air-to-air heat exchanger before entering the engine. This reduces intake air temperature, increases air density, improves combustion efficiency, and reduces thermal load on engine components.

This configuration distinguishes the QSB5.9-G2 from earlier turbocharged-only (T) or water-air intercooled (TA) variants and contributes to its EU Stage IIIA emission compliance without exhaust aftertreatment systems.

QSB5.9-G2 Technical Specifications

General Specifications

Performance

Fuel & Aspiration

Cooling & Starting

Installation Data

Emission & Compliance

Dimensions & Weight

Not sure if CPL 4813 matches your generator set? Send us your engine nameplate or ESN for quick verification before ordering.

QSB5.9 Series — Variant Comparison

All QSB5.9 variants share the same 5.9L, 6-cylinder in-line block and Turbocharged Air-Air Intercooler aspiration. Differences between variants are in power output and fuel system generation.

All variants: 1500 RPM / 50Hz | Turbocharged & Air-Air Intercooler

Note: The G30, G31, and G33 use a second-generation electronically controlled HPCR system offering enhanced load response and tighter speed regulation compared to the G2 and G3. For applications requiring precise parallel operation or grid-synchronization, the G30 series may be more appropriate.

Using the QSB5.9-G2 as a Replacement Engine

This section is intended for generator set owners and maintenance engineers evaluating whether the QSB5.9-G2 can replace an existing engine in a generator set frame.

Direct Replacement Criteria

The QSB5.9-G2 can serve as a direct replacement for an existing QSB5.9-G2 engine without frame or mounting modification, provided the following conditions are confirmed:

Dimensional Compatibility

The QSB5.9-G2 has fixed external dimensions of 1015 × 725 × 990 mm. Replacement engines supplied through our facility maintain the same physical envelope as the original DCEC factory specification. Mounting bolt patterns and flywheel housing conform to SAE standard interfaces used across the QSB5.9 G-Drive family.

CPL Code Verification

The CPL (Control Parts List) code for the QSB5.9-G2 is 4813. This code identifies the specific configuration of the engine, including injector calibration, governor settings, and component specifications. When ordering a replacement, confirming the CPL code of your existing engine ensures the replacement unit matches the original factory configuration.To locate your current engine's CPL code, check the dataplate mounted on the rocker cover or engine block.

Electrical Interface

The QSB5.9-G2 supports both 12V and 24V starting systems. Confirm your generator set's starting voltage before ordering to ensure harness compatibility. Wiring diagrams are available upon request.

Alternator Coupling

The QSB5.9-G2 uses a standard SAE flywheel and flywheel housing interface. It is compatible with alternators from Stamford, Leroy-Somer, Mecc Alte, Marathon Electric, and most other major alternator manufacturers used in 100–120kVA generator sets. Confirm your alternator's SAE coupling specification if you are unsure of compatibility.

Cross-Series Replacement Considerations

If you are replacing a different QSB5.9 variant (e.g., replacing a G3 with a G2, or upgrading from a G2 to a G3), note the following:

— All QSB5.9 variants share the same physical block dimensions and mounting interfaces. Frame and coupling modifications are generally not required.
— Power output will change according to the variant. Ensure your alternator and generator set control system are rated for the replacement engine's output.
— ECU and governor calibration differ between variants. A replacement engine of a different variant will require recalibration of the control panel settings.
— If replacing a non-QSB5.9 engine (e.g., a Perkins or Volvo engine), dimensional and interface verification is required on a case-by-case basis. Contact us with your existing engine model and generator set frame details for a compatibility assessment.

QSB5.9-G2 Parts Availability

In addition to complete engine assemblies, we supply individual components and service parts for the QSB5.9-G2. Parts are available as genuine DCEC Cummins components sourced through authorized supply channels.

Commonly Requested Service Parts

FILTRATION & FLUIDS: Engine Oil Filter, Fuel Filter (Primary & Secondary), Air Filter Element, Coolant Filter
FUEL SYSTEM: Fuel Injectors (HPCR Type),Fuel Injection Pump, High-Pressure Fuel Rail, Fuel Pressure Regulator
TURBOCHARGER & INTERCOOLER: Turbocharger Assembly, Intercooler Core, Boost Pressure Sensor
ENGINE INTERNAL COMPONENTS: Piston & Piston Ring Set, Cylinder Head Gasket Set, Connecting Rod Bearings, Main Bearings, Cylinder Liner
COOLING SYSTEM: Water Pump Assembly, Thermostat, Radiator (for complete genset applications), Fan Belt / Drive Belt
ELECTRICAL & STARTING SYSTEM: Starting Motor (12V / 24V), Alternator Charging Unit,Sensors (Oil Pressure / Coolant Temperature / Speed), ECU / Engine Control Module

Ordering Parts

When requesting parts, please provide the following information to ensure correct component identification:

1. Engine serial number (located on the engine dataplate)
2. CPL code (4813 for standard QSB5.9-G2)
3. Part number, if known (from Cummins parts catalogue or existing component labeling)
4. Description of the component and its location on the engine
5. Quantity required

Parts quotations are provided within 1–2 business days of inquiry.
Lead time for parts varies by component:
commonly stocked service items typically ship within 3–5 working days; major assemblies and low-frequency components within 10–15 working days.

Procurement Information

Engine Supply — What Is Provided

Each QSB5.9-G2 engine supplied through our facility includes:

— Factory-new DCEC Cummins engine assembly
— Engine dataplate with serial number and CPL code
— Factory inspection and test certificate
— Standard accessory kit (as per DCEC factory specification)
— Export packing (wooden crate, moisture protection)
— Commercial invoice, packing list, and bill of lading
— Certificate of Origin (CO) — available upon request
— Emission certification documentation (EU Stage IIIA)

Trade Terms & Logistics

TRADE TERMS：

Available Terms — FOB Shenzhen / CIF (destination port) / CNF
Payment Methods — T/T (Telegraphic Transfer) / L/C (Letter of Credit)
Minimum Order — 1 unit (single engine or parts order)

SHIPPING：

Port of Shipment — Shenzhen, China
Standard Transport — Sea freight
Expedited Transport — Air freight (available on request;  surcharge applies due to engine weight/dimensions)
Freight Partners — Masket / Zhongyuan (standard sea freight partners)

LEAD TIME：

Standard Lead Time — 15-30 working days from order confirmation and deposit receipt
Stock Availability — Contact us to confirm current stock status prior to order placement

Packing & Handling

The QSB5.9-G2 is shipped in a reinforced wooden export crate with internal foam and moisture-barrier protection. Packed dimensions are 1315 × 1025 × 1290 mm at 510 kg gross weight.
Engines are inspected and photographed prior to packing. Packing condition photographs are available upon request before shipment.
For sea freight, engines are typically shipped as LCL (Less than Container Load) for single units, or FCL (Full Container Load) for bulk orders. Standard 20ft container capacity is approximately 18–20 units depending on loading configuration.

Warranty Coverage

Standard Warranty Terms

Every QSB5.9-G2 engine supplied through our facility carries a standard warranty of 1 year or 1,500 operating hours — whichever occurs firs from the date of delivery.

WHAT IS COVERED

Manufacturing defects in materials and workmanship under normal operating conditions, as defined by DCEC Cummins service standards.

WHAT IS NOT COVERED

— Normal wear parts (filters, belts, gaskets under routine service)
— Damage resulting from improper installation or commissioning
— Damage caused by use of non-approved fuels, lubricants, or coolants
— Failure to follow Cummins-specified service intervals
— Physical damage caused during transportation after delivery
— Modifications made to the engine without authorization

WARRANTY CLAIM PROCESS

Step 1: Contact us by email with engine serial number, CPL code, description of the issue, and supporting photographs or video documentation.
Step 2: Our technical team reviews the claim within 2 business days and determines whether the issue falls within warranty coverage.
Step 3: For confirmed warranty cases, we arrange replacement components or engine exchange depending on the nature of the defect.Outbound freight for warranty replacements is covered by us. Return freight for defective components is the buyer's responsibility unless otherwise agreed in writing.
Step 4: Resolution timeline for warranty cases is 5–15 working days depending on parts availability and shipping destination.

FAQ

Q1: How do I confirm the QSB5.9-G2 is compatible with my existing generator set frame?

The primary compatibility factors are mounting dimensions, flywheel housing SAE specification, and CPL code. The QSB5.9-G2 has fixed external dimensions of 1015 × 725 × 990 mm and uses a standard SAE flywheel housing interface. If you can provide your generator set make, model, and the dataplate information from your existing engine, we can confirm compatibility before you place an order.

Q2: What does the CPL code 4813 mean and why does it matter?

The CPL (Control Parts List) code is a Cummins identifier that defines the complete configuration of a specific engine variant — including injector calibration, governor parameters, and component specifications. The CPL code for the QSB5.9-G2 is 4813. When ordering a replacement engine, matching the CPL code to your original engine ensures the replacement unit performs identically to the factory specification without requiring recalibration.

Q3: What is the difference between the QSB5.9-G2 and QSB5.9-G3?

The G2 and G3 share the same engine block, aspiration system, and HPCR fuel system. The G3 produces 120kW prime power (132kW standby) compared to the G2's 96kW prime (106kW standby). Physically, both engines use the same mounting dimensions and flywheel housing, so the G3 can be fitted in a frame designed for the G2 — but the alternator and control system must be rated for the higher output.

Q4: Can the QSB5.9-G2 operate at 60Hz?

Yes. The QSB5.9-G2 can operate at 1800RPM for 60Hz generator set applications. Power output at 1800RPM differs from the 1500RPM rating. Please specify your intended operating frequency when requesting a quotation so the correct configuration can be confirmed.

Q5: Are the engines supplied new or remanufactured?

All complete engine assemblies we supply are factory-new units manufactured by DCEC Cummins. Each engine carries a factory serial number, dataplate, and inspection certificate. We do not supply remanufactured or rebuilt engines as new. If you require remanufactured units, please contact us separately to discuss availability.

Q6: What emission standard does the QSB5.9-G2 meet, and is it sufficient for my market?

The QSB5.9-G2 is certified to EU Stage IIIA and China NS III emission standards. These standards apply to non-road mobile machinery (NRMM) engines and are widely accepted in markets across Asia, the Middle East, Africa, and Latin America.Markets enforcing stricter standards — such as EU Stage V (applicable to new NRMM sold in the European Union from 2019 onward) — may require a different engine variant. If emission compliance is a project requirement, confirm the applicable standard with your local regulatory authority before ordering.

Q7: What happens if the engine is damaged during shipping?

All engines are photographed before packing and shipped in reinforced export crating with internal protection. For CIF shipments, marine cargo insurance is included in the freight arrangement.
In the event of transit damage, the following documentation is required to initiate a claim: photographs of the damage, original packing condition photographs (provided by us before shipment), and a surveyor's report if required by the insurer. We assist buyers in preparing claim documentation as needed.For FOB shipments, cargo insurance from the point of loading is the buyer's responsibility.

Q8: Can I order parts separately without purchasing a complete engine?

Yes. Parts orders are accepted independently of complete engine orders. Minimum order value for parts shipments is USD 200. Parts are shipped from Shenzhen via sea or air freight depending on urgency and shipment size. Provide your engine serial number and CPL code when ordering to ensure correct part identification.

Q9: What technical documentation is available for the QSB5.9-G2?

The following documentation is available upon request:

— Operation and Maintenance Manual (English)
— Parts Catalogue with part numbers
— Installation dimensions drawing
— Wiring / electrical interface diagram
— Engine test certificate (supplied with each unit)
— EU Stage IIIA emission certification
— Control panel integration guides
 (Deepsea / ComAp / Smartgen / Harsen)
Documentation is provided in digital format (PDF) at no additional charge.

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