Generac
Generac 4.2L V6 Gas
Legacy Liquid-Cooled Gas
Generac 4.2L V6 Gas is a legacy naturally aspirated, liquid-cooled spark-ignited engine used in QT commercial standby generator sets including 35-48 kW nodes. EPA families rooted at AGNXB04.22L1 through AGNXB04.22NN record 49.3-55.4 kWm natural-gas and propane calibrations at the 1800 RPM certification test speed.
Overhaul & repair parts- Manufacturer files
- No datasheet
- Last updated
- 2026-07-25
- Package route
- gas generator sets
- Mechanical Output
- 55 kW
- Cylinders
- V6
- Displacement
- 4.2 L
- Rated Speed
- 1,500 RPM
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Generac 4.2L V6 Gas overhaul & repair parts
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Generac 4.2L V6 Gas generator set context
The Generac 4.2L V6 Gas is listed here as a natural gas generator-drive engine for 50 Hz generator sets, with a headline 55 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 | Generac |
| Model | 4.2L V6 Gas |
| Series | Legacy Liquid-Cooled Gas |
| Configuration | V6 Naturally Aspirated |
| Cylinders | 6 |
| Displacement | 4.2 L |
| Fuel Type | Natural Gas |
| Ignition Type | Spark Ignition |
| Cooling Method | Liquid-Cooled |
| Emissions Standard | U.S. EPA Stationary |
| Certifications | U.S. EPA Stationary, U.S. EPA NSPS Subpart JJJJ |
| Country of Origin | United States |
| Year Introduced | 2011 |
| Year Discontinued | 2012 |
Frequently asked questions
What fuel does the Generac 4.2L V6 Gas use?
The Generac 4.2L V6 Gas is a Natural Gas generator-set engine.
What is the displacement and cylinder configuration of the 4.2L V6 Gas?
The Generac 4.2L V6 Gas is a V6 (6-cylinder) engine with a displacement of 4.2 L.
What emissions information is listed for the 4.2L V6 Gas?
This record lists U.S. EPA Stationary for the Generac 4.2L V6 Gas. 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.
Is the 4.2L V6 Gas still in production?
No — the Generac 4.2L V6 Gas is discontinued (production ended around 2012). Its specifications and datasheets remain archived here for reference.