Weichai
Weichai 6M31D680E311
Weichai 6M31D680E311. Source: 发动机数据单-6M31-6031_6M31D680E311_NonRad无散热器_Datasheet_26-01-10.pdf, p.1. Gross engine mechanical PRP 640 kW / ESP 680 kW at 1800 rpm. Net power is configuration-dependent and separate from gross mechanical output; no electrical genset output inferred. Emissions statement as printed: China Non-road III; no additional certification inferred. Production status is unknown; discontinued is the user-authorized catalogue classification, not manufacturer-confirmed cessation. No production-end year asserted. Physical specifications added from manufacturer datasheets, 2026-10-21: compression ratio 14:1; dry engine weight 1589 kg without radiator and radiator pipes; overall dimensions without radiator (L × W × H) 2310 × 1125 × 1720 mm. Sources: 发动机数据单-6M31-6031_6M31D680E311_NonRad无散热器_Datasheet_26-01-10.pdf (physical data on pp.1–2). Existing populated specification fields were not overwritten. Weight is dry engine weight, not genset shipping weight.
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- 1 document · 1 datasheet
- Last updated
- 2026-10-21
- Package route
- diesel generator sets
- Mechanical Output
- 680 kW
- Cylinders
- L6
- Displacement
- 18.5 L
- Rated Speed
- 1,800 RPM
Power Ratings
kWm = mechanical shaft power · kWe = electrical output · kVA = kWe ÷ 0.8 pf
60 Hz1800 RPM
| kWm | kWe | kVA | |
|---|---|---|---|
| Prime Power | 640 | — | — |
| Standby Power | 680 | — | — |
Estimated rating: 612 kWe (680 kW × 0.90) · 60 Hz · standby
Estimated rating: 576 kWe (640 kW × 0.90) · 60 Hz · prime
Planning estimate, not a manufacturer generator rating. Confirm the alternator, engine speed and operating conditions.
Weichai 6M31D680E311 overhaul & repair parts
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Weichai 6M31D680E311 generator set context
The Weichai 6M31D680E311 is listed here as a diesel generator-drive engine for 60 Hz generator sets, with a headline 680 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.
Model name formats
Technical Specifications
| Brand | Weichai |
| Model | 6M31D680E311 |
| Configuration | L6 |
| Cylinders | 6 |
| Displacement | 18.5 L |
| Compression Ratio | 14:1 |
| Dry Weight | 1589 kg |
| Dimensions (L×W×H) | 2310 × 1125 × 1720 mm |
| Fuel Type | Diesel |
| Ignition Type | Compression Ignition |
| Cooling Method | Liquid-Cooled |
| Emissions Standard | China Non-road III |
Frequently asked questions
Does the 6M31D680E311 run at 50 Hz or 60 Hz?
The Weichai 6M31D680E311 is rated for 60 Hz (1,800 rpm).
What fuel does the Weichai 6M31D680E311 use?
The Weichai 6M31D680E311 is a diesel generator-set engine.
What is the displacement and cylinder configuration of the 6M31D680E311?
The Weichai 6M31D680E311 is an inline-6 (6-cylinder) engine with a displacement of 18.5 L.
What emissions information is listed for the 6M31D680E311?
This record lists China Non-road III for the Weichai 6M31D680E311. 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 6M31D680E311 still in production?
No — the Weichai 6M31D680E311 is discontinued. Its specifications and datasheets remain archived here for reference.
Are reference documents available for the 6M31D680E311?
This page links reference documents for the Weichai 6M31D680E311. Check each document's title, model coverage, revision and rating conditions before using it for selection.