Used Komatsu 4D94 Diesel Engine | 3.3L 4-Cylinder | Rebuilt for Excavators & Wheel Loaders

Parameter	Specification
Engine Model	Komatsu 4D94 Series
Displacement	3.3 Liters (approx. 179 cu in)
Configuration	Inline 4 Cylinder, 4-Stroke
Bore × Stroke	94 mm × 100 mm
Power Output	39 HP to 70 HP, depending on model and application
Aspiration	Naturally Aspirated or Turbocharged (varies by variant)
Fuel System	Direct Injection (some variants) / Indirect Injection
Cooling System	Liquid-Cooled
Dry Weight	Approximately 350-400 kg

Category Komatsu Engine

Are you looking for a replacement engine for your Komatsu excavator or wheel loader? This used Komatsu 4D94 diesel engine is a reliable choice for many types of construction equipment. The 4D94 is a four-cylinder, water-cooled, 4-stroke diesel engine. It has a displacement of about 3.3 liters. The cylinder bore measures 94 mm, and the stroke is 100 mm. This engine is widely used in Komatsu’s mid-sized machinery. We have professionally rebuilt this used engine to restore its original performance. It offers a cost‑effective way to keep your equipment running.

Technical Specifications

Parameter	Specification
Engine Model	Komatsu 4D94 Series
Displacement	3.3 Liters (approx. 179 cu in)
Configuration	Inline 4 Cylinder, 4-Stroke
Bore × Stroke	94 mm × 100 mm
Power Output	39 HP to 70 HP, depending on model and application
Aspiration	Naturally Aspirated or Turbocharged (varies by variant)
Fuel System	Direct Injection (some variants) / Indirect Injection
Cooling System	Liquid-Cooled
Dry Weight	Approximately 350-400 kg

Key Features & Rebuild Quality

Built for Construction Equipment: Komatsu designed this engine for mid-sized machines like excavators, wheel loaders, and bulldozers. It delivers strong torque at lower RPMs, which is what digging and lifting tasks require.
Multiple Variants Available: The 4D94 engine comes in several versions. These include the 4D94E, 4D94LE, and 4D94-2 models. Some versions use direct injection for better fuel efficiency. Others use indirect injection for smoother cold starts. This means you can find the right fit for your specific machine.
Proven in Komatsu Equipment: This engine powers many Komatsu models. It is found in the PC series excavators, WA series wheel loaders, and D series bulldozers. It has earned a strong reputation for durability in construction and mining applications.
Complete Rebuild Process: We fully disassembled this used engine. We inspected the cylinder block and cylinder head. We serviced the fuel injection system and turbocharger if equipped. We replaced all critical wear parts with new components to meet original factory standards.
Ready to Install: This engine ships as a complete unit. It comes with pre-installed filters and fluids. Necessary mounting hardware is included. This makes the installation process more straightforward. It helps reduce equipment downtime.

Value & Warranty

Cost‑Effective Choice: This rebuilt used Komatsu engine costs much less than a new one. You get reliable power for your equipment at a fraction of the price.
Warranty Included: We stand behind our rebuild work. This engine comes with a comprehensive warranty. Contact us for the specific terms.

Primary Applications

Excavators: Direct replacement for Komatsu PC series mid-size excavators.
Wheel Loaders: Suitable for Komatsu WA series compact and mid-size loaders.
Bulldozers: Used in Komatsu D series dozer models.
Industrial Equipment: Powers generators, pumps, and other stationary applications.