Yuchai
Yuchai YCMJ12550-D40
MJ12
The Yuchai YCMJ12550-D40 is a 11.73-litre inline-6 diesel engine for generator sets, rated at 425 kVA / 340 kWe standby power at 1,500 RPM (50 Hz). It is a liquid-cooled engine built in China.
Overhaul & repair parts- Supporting documents
- No documents linked
- Last updated
- 2026-05-29
- Package route
- diesel generator sets
- Standby Power · 50 Hz
- 425 kVA
- Electrical Output
- 340 kWe
- Cylinders
- L6
- Displacement
- 11.73 L
- Rated Speed
- 1,500 RPM
Power Ratings
kWm = mechanical shaft power · kWe = electrical output · kVA = kWe ÷ 0.8 pf
50 Hz1500 RPM
| kWm | kWe | kVA | |
|---|---|---|---|
| Prime Power | 355.6 | 320 | 400 |
| Standby Power | 377.8 | 340 | 425 |
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Yuchai YCMJ12550-D40 overhaul & repair parts
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Yuchai YCMJ12550-D40 generator set context
The Yuchai YCMJ12550-D40 is listed here as a diesel generator-drive engine for 50 Hz generator sets, with a headline 425 kVA / 340 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 | Yuchai |
| Model | YCMJ12550-D40 |
| Series | MJ12 |
| Configuration | L6 |
| Cylinders | 6 |
| Displacement | 11.73 L |
| Fuel Type | Diesel |
| Ignition Type | Compression Ignition |
| Cooling Method | Liquid-Cooled |
| Emissions Standard | China National Stage IV / Unregulated |
| Country of Origin | China |
Frequently asked questions
What is the power output of the Yuchai YCMJ12550-D40?
The Yuchai YCMJ12550-D40 is rated at 425 kVA standby / 400 kVA prime at 50 Hz (1,500 rpm).
Does the YCMJ12550-D40 run at 50 Hz or 60 Hz?
The Yuchai YCMJ12550-D40 is rated for 50 Hz (1,500 rpm).
What fuel does the Yuchai YCMJ12550-D40 use?
The Yuchai YCMJ12550-D40 is a diesel generator-set engine.
What is the displacement and cylinder configuration of the YCMJ12550-D40?
The Yuchai YCMJ12550-D40 is an inline-6 (6-cylinder) engine with a displacement of 11.73 L.
What is the catalog status of the Yuchai YCMJ12550-D40?
The Yuchai YCMJ12550-D40 is marked active in this database. Confirm current production and availability with the manufacturer; catalog status is not a live supply check.