Weichai
Weichai 6M31D640E310
M31 Series
Weichai 6M31D640E310 is an 18.5 L inline-six diesel engine. The manufacturer lists 580/640 kW mechanical prime/standby output at 1,500 rpm and recommends 520/580 kWe prime/standby generator output. Electrical output depends on the assembled package and site conditions; kVA is calculated at 0.8 power factor. The cited table does not establish a 60 Hz rating for this exact model. Source checked 2026-09-29: https://service.weichai.com/group/product/cn/products/energy-power/power-generation/weichai/diesel/2026042714311882312/index.html
Overhaul & repair parts- Supporting documents
- No documents linked
- Last updated
- 2026-09-29
- Package route
- diesel generator sets
- Standby Power · 50 Hz
- 725 kVA
- Electrical Output
- 580 kWe
- Cylinders
- L6
- Displacement
- 18.5 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 | 580 | 520 | 650 |
| Standby Power | 640 | 580 | 725 |
Rating scope and manufacturer source
Weichai lists these 18.5 L inline-six engines at 1,500 rpm. The electrical figures are the manufacturer’s recommended generator outputs, not measured results for every assembled package. Confirm the alternator, operating duty and site conditions for your set. kVA is calculated from kWe at 0.8 power factor.
The cited table does not provide 1,800 rpm / 60 Hz ratings for these exact models. A missing rating means unverified, not that a 60 Hz configuration is impossible.
Weichai 6M31 generator-drive engine model table · Source checked 2026-09-29
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Weichai 6M31D640E310 generator set context
The Weichai 6M31D640E310 is listed here as a diesel generator-drive engine for 50 Hz generator sets, with a headline 725 kVA / 580 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 | Weichai |
| Model | 6M31D640E310 |
| Series | M31 Series |
| Configuration | L6 |
| Cylinders | 6 |
| Displacement | 18.5 L |
| Fuel Type | Diesel |
| Ignition Type | Compression Ignition |
| Cooling Method | Liquid-Cooled |
| Emissions Standard | China National Stage III / Unregulated |
| Country of Origin | China |
Frequently asked questions
What is the power output of the Weichai 6M31D640E310?
Weichai recommends 520 kWe prime and 580 kWe standby generator output for the Weichai 6M31D640E310 at 1,500 rpm. Weichai lists these 18.5 L inline-six engines at 1,500 rpm. The electrical figures are the manufacturer’s recommended generator outputs, not measured results for every assembled package. Confirm the alternator, operating duty and site conditions for your set. kVA is calculated from kWe at 0.8 power factor.
Does the 6M31D640E310 run at 50 Hz or 60 Hz?
The cited model table supports the 1,500 rpm / 50 Hz figures shown here. The cited table does not provide 1,800 rpm / 60 Hz ratings for these exact models. A missing rating means unverified, not that a 60 Hz configuration is impossible.
What fuel does the Weichai 6M31D640E310 use?
The Weichai 6M31D640E310 is a diesel generator-set engine.
What is the displacement and cylinder configuration of the 6M31D640E310?
The Weichai 6M31D640E310 is an inline-6 (6-cylinder) engine with a displacement of 18.5 L.
What is the catalog status of the Weichai 6M31D640E310?
The Weichai 6M31D640E310 is marked active in this database. Confirm current production and availability with the manufacturer; catalog status is not a live supply check.