Komatsu
Komatsu S6D125-1
125 Series
Komatsu S6D125-1 discontinued legacy engine. Older Komatsu 125 Series mechanical diesel used in dozers and heavy construction equipment.
Overhaul & repair parts- Manufacturer files
- No datasheet
- Last updated
- 2026-08-04
- Package route
- diesel generator sets
- Maximum Mechanical Power
- 163 kW
- Cylinders
- L6
- Displacement
- 11.04 L
- Rated Speed
- 2,000 RPM
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Komatsu S6D125-1 overhaul & repair parts
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Komatsu S6D125-1 industrial power context
The Komatsu S6D125-1 is a high-speed industrial diesel engine rated at 163.3 kW mechanical output at 2,000 RPM. It is used in off-road equipment and can support engineered variable-speed power systems, but its maximum power is not a direct 50/60 Hz alternator rating. Verify the drivetrain, power electronics, cooling, and emissions installation with Volvo Penta before specifying a generator package.
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Technical Specifications
| Brand | Komatsu |
| Model | S6D125-1 |
| Series | 125 Series |
| Configuration | L6, naturally aspirated |
| Cylinders | 6 |
| Displacement | 11.04 L |
| Fuel Type | Diesel |
| Ignition Type | Compression Ignition |
| Cooling Method | Liquid-Cooled |
| Emissions Standard | Unregulated |
| Country of Origin | Japan |
Frequently asked questions
What is the maximum power output of the Komatsu S6D125-1?
The Komatsu S6D125-1 has a maximum mechanical output of 163.3 kW at 2,000 rpm. This is a variable-speed off-road rating, not a fixed-speed generator-set rating.
What fuel does the Komatsu S6D125-1 use?
The Komatsu S6D125-1 is a diesel variable-speed industrial engine.
What is the displacement and cylinder configuration of the S6D125-1?
The Komatsu S6D125-1 is an inline-6 (6-cylinder) engine with a displacement of 11.04 L.
Is the S6D125-1 still in production?
No — the Komatsu S6D125-1 is discontinued. Its specifications and datasheets remain archived here for reference.