Cummins
Cummins QSB4.5
QSB4.5 Series
Cummins QSB4.5 is a 4.46 L inline-4 turbocharged and aftercooled diesel engine. EPA annual certification data lists QSB5-G7, QSB5-G8 and QSB5-G9 generator configurations from 83 to 129 kWm at 1800 RPM under Interim Tier 4. The broader commercial platform also includes Tier 3 and Tier 4 Final configurations up to 155 kWm.
Overhaul & repair parts- Manufacturer files
- 1 datasheet
- Last updated
- 2026-07-25
- Package route
- diesel generator sets
- Mechanical Output
- 155 kW
- Cylinders
- L4
- Displacement
- 4.46 L
- Rated Speed
- 1,500 RPM
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Cummins QSB4.5 overhaul & repair parts
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Cummins QSB4.5 generator set context
The Cummins QSB4.5 is listed here as a diesel generator-drive engine for 50 Hz generator sets, with a headline 155 kW / standby rating. Use this page to compare the published engine output, electrical kWe/kVA ratings, emissions level, datasheet availability, and neighboring models before specifying an alternator, controller, enclosure, voltage, and compliance package.
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Technical Specifications
| Brand | Cummins |
| Model | QSB4.5 |
| Series | QSB4.5 Series |
| Configuration | L4 |
| Cylinders | 4 |
| Displacement | 4.46 L |
| Fuel Type | Diesel |
| Ignition Type | Compression Ignition |
| Cooling Method | Liquid-Cooled |
| Emissions Standard | U.S. EPA Tier 3 / U.S. EPA Interim Tier 4 / U.S. EPA Final Tier 4 |
| Certifications | U.S. EPA Tier 3, U.S. EPA Interim Tier 4, U.S. EPA Tier 4 Final |
| Country of Origin | United States |
Frequently asked questions
What fuel does the Cummins QSB4.5 use?
The Cummins QSB4.5 is a diesel generator-set engine.
What is the displacement and cylinder configuration of the QSB4.5?
The Cummins QSB4.5 is an inline-4 (4-cylinder) engine with a displacement of 4.46 L.
What emissions information is listed for the QSB4.5?
This record lists U.S. EPA Tier 3 / U.S. EPA Interim Tier 4 / U.S. EPA Final Tier 4 for the Cummins QSB4.5. Confirm the exact engine family, model year, configuration and applicable manufacturer certification documents before specifying it for a regulated project. A database label does not establish certification of a complete generator package.
What is the catalog status of the Cummins QSB4.5?
The Cummins QSB4.5 is marked active in this database. Confirm current production and availability with the manufacturer; catalog status is not a live supply check.
Are reference documents available for the QSB4.5?
This page links reference documents for the Cummins QSB4.5. Check each document's title, model coverage, revision and rating conditions before using it for selection.