PSI
PSI Legacy 3.0L L4
Legacy Industrial
PSI Legacy 3.0L L4 is a liquid-cooled spark-ignited industrial engine platform. PSI publishes the official 3.0 L engine service manual, while EPA lineage 9PSIB2.972ED identifies the 2.972 L four-cylinder stationary natural-gas configuration at 1800 RPM. The 36.7 kW value is the EPA certification power node, not a claimed generator-set electrical rating.
Overhaul & repair parts- Manufacturer files
- 2 datasheets
- Last updated
- 2026-07-25
- Package route
- gas generator sets
- Mechanical Output
- 37 kW
- Cylinders
- L4
- Displacement
- 2.972 L
- Rated Speed
- 1,500 RPM
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PSI Legacy 3.0L L4 overhaul & repair parts
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PSI Legacy 3.0L L4 generator set context
The PSI Legacy 3.0L L4 is listed here as a natural gas generator-drive engine for 50 Hz generator sets, with a headline 37 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 | PSI |
| Model | Legacy 3.0L L4 |
| Series | Legacy Industrial |
| Configuration | L4 Naturally Aspirated |
| Cylinders | 4 |
| Displacement | 2.972 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 | 2016 |
Frequently asked questions
What fuel does the PSI Legacy 3.0L L4 use?
The PSI Legacy 3.0L L4 is a Natural Gas generator-set engine.
What is the displacement and cylinder configuration of the Legacy 3.0L L4?
The PSI Legacy 3.0L L4 is an inline-4 (4-cylinder) engine with a displacement of 2.972 L.
What emissions information is listed for the Legacy 3.0L L4?
This record lists U.S. EPA Stationary for the PSI Legacy 3.0L L4. 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 Legacy 3.0L L4 still in production?
No — the PSI Legacy 3.0L L4 is discontinued (production ended around 2016). Its specifications and datasheets remain archived here for reference.
Are reference documents available for the Legacy 3.0L L4?
This page links reference documents for the PSI Legacy 3.0L L4. Check each document's title, model coverage, revision and rating conditions before using it for selection.