Isuzu
Isuzu 4JJ1X
4J-Series
Isuzu 4JJ1X 2.999L 4-cylinder diesel engine for generator sets. 71 kW prime at 60Hz. U.S. EPA Final Tier 4. Turbocharged, Intercooled.
Overhaul & repair parts- Manufacturer files
- 2 datasheets
- Last updated
- 2026-06-11
- Package route
- diesel generator sets
- Standby Power · 50 Hz
- 71 kVA
- Electrical Output
- 56 kWe
- Cylinders
- L4
- Displacement
- 2.999 L
- Rated Speed
- 1,500 / 1,800 RPM
Power Ratings
kWm = mechanical shaft power · kWe = electrical output · kVA = kWe ÷ 0.8 pf · kWe estimated — see note below
50 Hz1500 RPM
| kWm | kWe | kVA | |
|---|---|---|---|
| Prime Power | 57 | 51.3 | 64.1 |
| Standby Power | 62.7 | 56.4 | 70.5 |
60 Hz1800 RPM
| kWm | kWe | kVA | |
|---|---|---|---|
| Prime Power | 71 | 63.9 | 79.9 |
| Standby Power | 78.1 | 70.3 | 87.9 |
Note: The manufacturer does not publish a separate kWe rating for this engine. kWe values shown are estimated from the rated mechanical output (kWm) using a conservative 90% alternator efficiency factor.
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Isuzu 4JJ1X overhaul & repair parts
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Isuzu 4JJ1X generator set context
The Isuzu 4JJ1X is listed here as a diesel generator-drive engine for 50 Hz and 60 Hz generator sets, with a headline 71 kVA / 56 kWe / 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 | Isuzu |
| Model | 4JJ1X |
| Series | 4J-Series |
| Configuration | L4 |
| Cylinders | 4 |
| Displacement | 2.999 L |
| Fuel Type | Diesel |
| Ignition Type | Compression Ignition |
| Cooling Method | Liquid-Cooled |
| Emissions Standard | U.S. EPA Final Tier 4 |
| Country of Origin | Japan |
Frequently asked questions
What is the power output of the Isuzu 4JJ1X?
The Isuzu 4JJ1X is rated at 71 kVA standby / 64 kVA prime at 50 Hz (1,500 rpm); and 88 kVA standby / 80 kVA prime at 60 Hz (1,800 rpm).
Does the 4JJ1X run at 50 Hz or 60 Hz?
The Isuzu 4JJ1X is available for both 50 Hz (1,500 rpm) and 60 Hz (1,800 rpm).
What fuel does the Isuzu 4JJ1X use?
The Isuzu 4JJ1X is a diesel generator-set engine.
What is the displacement and cylinder configuration of the 4JJ1X?
The Isuzu 4JJ1X is an inline-4 (4-cylinder) engine with a displacement of 2.999 L.
What emissions information is listed for the 4JJ1X?
This record lists U.S. EPA Final Tier 4 for the Isuzu 4JJ1X. 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 Isuzu 4JJ1X?
The Isuzu 4JJ1X 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 4JJ1X?
This page links reference documents for the Isuzu 4JJ1X. Check each document's title, model coverage, revision and rating conditions before using it for selection.