Mitsubishi
Mitsubishi S12R-Y2PTAW-1
S12R Series
Mitsubishi S12R-Y2PTAW-1 49.03L 12-cylinder diesel engine for generator sets. 1250 kWe standby / 1125 kWe prime at 60Hz/1800RPM. EPA Tier 2 stationary standby. Turbocharged Aftercooled.
Overhaul & repair parts- Manufacturer files
- 2 datasheets
- Last updated
- 2026-06-11
- Package route
- diesel generator sets
- Standby Power · 60 Hz
- 1,563 kVA
- Electrical Output
- 1,250 kWe
- Cylinders
- V12
- Displacement
- 49.03 L
- Rated Speed
- 1,800 RPM
Power Ratings
kWm = mechanical shaft power · kWe = electrical output · kVA = kWe ÷ 0.8 pf · kWe estimated — see note below
60 Hz1800 RPM
| kWm | kWe | kVA | |
|---|---|---|---|
| Prime Power | 1250 | 1125 | 1406.3 |
| Standby Power | 1388.9 | 1250 | 1562.5 |
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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Mitsubishi S12R-Y2PTAW-1 overhaul & repair parts
Already running a Mitsubishi S12R-Y2PTAW-1? Start with the parts you need, then send your nameplate so we can help check the right references for your engine.
Reviewed part-number references
A starting point for identification. Fitment must be confirmed before ordering.
- Turbocharger49129-02020
Turbocharger assembly
Fitment check: Match the exact MTEA Engine Type label S12R-Y2PTAW-1; use the complete engine serial number and current MEeS illustration to select among all listed turbocharger numbers before ordering
Source: Mitsubishi Turbocharger and Engine America official catalog - 49129-02020-Turbocharger
Selected references only; this is not a complete overhaul list or a stock listing.
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Mitsubishi S12R-Y2PTAW-1 generator set context
The Mitsubishi S12R-Y2PTAW-1 is listed here as a diesel generator-drive engine for 60 Hz generator sets, with a headline 1,563 kVA / 1,250 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 | Mitsubishi |
| Model | S12R-Y2PTAW-1 |
| Series | S12R Series |
| Configuration | V12 |
| Cylinders | 12 |
| Displacement | 49.03 L |
| Fuel Type | Diesel |
| Ignition Type | Compression Ignition |
| Cooling Method | Liquid-Cooled |
| Emissions Standard | U.S. EPA Tier 2 |
| Country of Origin | Japan |
Frequently asked questions
What is the power output of the Mitsubishi S12R-Y2PTAW-1?
The Mitsubishi S12R-Y2PTAW-1 is rated at 1,563 kVA standby / 1,406 kVA prime at 60 Hz (1,800 rpm).
Does the S12R-Y2PTAW-1 run at 50 Hz or 60 Hz?
The Mitsubishi S12R-Y2PTAW-1 is rated for 60 Hz (1,800 rpm).
What fuel does the Mitsubishi S12R-Y2PTAW-1 use?
The Mitsubishi S12R-Y2PTAW-1 is a diesel generator-set engine.
What is the displacement and cylinder configuration of the S12R-Y2PTAW-1?
The Mitsubishi S12R-Y2PTAW-1 is a V12 (12-cylinder) engine with a displacement of 49.03 L.
What emissions information is listed for the S12R-Y2PTAW-1?
This record lists U.S. EPA Tier 2 for the Mitsubishi S12R-Y2PTAW-1. 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 Mitsubishi S12R-Y2PTAW-1?
The Mitsubishi S12R-Y2PTAW-1 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 S12R-Y2PTAW-1?
This page links reference documents for the Mitsubishi S12R-Y2PTAW-1. Check each document's title, model coverage, revision and rating conditions before using it for selection.