Komatsu

Komatsu Marine Engines & OEM Spare Parts

State-of-the-art Propulsion Engines and Gensets for Heavy-Duty Marine Applications

Are you looking to upgrade to the next-generation marine engines?

Whether a top-tier auxiliary power solution is on your mind or you are looking for the best-in-class main engine for energy-efficient propulsion performance, Komatsu marine engines are the prime choice for your needs. Alfa Marine Spare Parts is your reliable global supplier of genuine Komatsu marine engines, electrical systems, and spare parts.

Komatsu marine engines are the best bet for operating bulk fishing carriers, cargo ships, workboats, passenger ferries, patrol vessels, and others. The compact design modules fit in tight spaces without technical issues. These revolutionary engines are valued worldwide by our customers for their extended lifecycle, minimal maintenance requirements, high-end fuel efficiency, matchless control during maneuvering and high RPM, and stability.

Why Upgrade to Komatsu Marine Engines

Komatsu engines are dynamic vessel powering modules with a futuristic design. The flexibility and adjustability to varying operational needs allow greater convenience for vessel operators to adapt to diverse marine conditions. These engines comprise replaceable spare parts for quick fixture. All Komatsu engine components are easy to replenish with OEM replacement parts.

The Komatsu marine engine lineup includes popular models such as the 6M125, 6M132, 6M170, and 12M140, delivering a broad power band from mid-range outputs to high-performance ratings exceeding 950 PS. These modules feature direct injection technology, integrated turbo-intercooler heat management, and multiple duty ratings, ensuring maximum uptime and minimal lifecycle costs.

We also offer a full range of OEM Komatsu spare parts to keep your engine running at peak performance—cylinder kits, pistons, gaskets, turbos, injectors, cooling components, and more—sourced directly from trusted Komatsu supply chains.

• A wide range of Komatsu marine engines is available for immediate supply.
• Genuine OEM spare parts for 6M and legacy Komatsu models.
• Global sourcing and reliable shipping solutions.

Komatsu Engine Design and Technical Specifications

When heavy-duty propulsion is the top priority, there is no looking beyond the Komatsu marine engines. Trust these engines for enhanced service life, innovative combustion technology, and high torque. These engines are available in the in-line 6-cylinder (6M Series) and 12-cylinder (12M Series) in V-shaped configuration. Here is an overview of technical engine specifications for diverse marine applications.

• Cycle: 4-stroke diesel engines
• Injection Technology: direct-injection system.
• Aspiration: Turbocharged with an intercooler for enhanced exhaust gas management, fuel efficiency, and power density.
• Combustion: Direct injection with optimized fuel mapping for clean ignition for successive cycles and minimal emissions.

Displacement, Bore & Stroke

The Komatsu marine engines in the 6M Series boast superior displacement for high torque at low-to-mid rpm ranges, ideal for heavyweight commercial vessels.

6M125 Series

• • Displacement: 11.0 L

• • Bore × Stroke: 125 × 150 mm

• • Cylinders: in-line 6 cylinders in a V-shape arrangement

6M170 Series

• • Displacement: 23.1 L

• • Bore × Stroke: 170 × 170 mm

• • Cylinders: in-line 6 cylinders in a V-shape arrangement

The long-stroke design in 6M170 engines provides steady torque curves that support the vessel’s load and control, making them ideal for heavy-duty marine propulsion and maneuvering.

Power Ratings & Duty Cycles

Komatsu marine engines feature multiple duty ratings (continuous, heavy-duty, light-duty) to match various vessel profiles.

• 6M125AP-2: 404 kW (550 PS) @ 2,300 rpm
• 6M125AL-5: 489 kW (665 PS) @ 2,300 rpm
• 6M125AP-5: 495 kW (673 PS) @ 2,300 rpm
• 6M170AP-5: 869 PS @ 1,938 rpm (rated), 954 PS @ 2,000 rpm (max)

These power outputs ensure decent cruising speeds streamlined for fishing boats, workboats, ferries, and transport crafts.

Cooling & Lubrication

• Cooling System: Freshwater cooling with a heat exchanger for efficient thermal management.
• Lubrication: Gear-driven pump for forced lubrication for continuous heavy-duty frictionless operations without overheating or wearing.
• Oil Capacity: Large sump volumes for extended service intervals.

Dimensions & Weight

Komatsu engines strike a balance between compact layouts and robust blocks and crankcases, offering superb durability and stringent performance in marine applications.

6M125 Series

• • Length: ~1,975–2,096 mm

• • Width: ~1,034–1,159 mm

• • Dry Weight: ~1,530–1,790 kg

6M170 Series

• • Length: ~1,860 mm

• • Width: ~1,240 mm

• • Dry Weight: ~4,005 kg

• • Larger block and heavier structure for high-output propulsion systems.

Emissions & Compliance

• Komatsu marine engines meet Japan Tier 2 emission standards.
• The combustion chambers and the injection system are optimised for minimal exhaust gases and NOx emissions.
• Compliance varies by model and regional regulations. Verify the documents for IMO and EPA Tier provisions applicable to vessels operating in international maritime zones.

Key Technical Features

• Heavy-duty crankshaft and bearings support continuous marine load.
• High-capacity turbochargers with an intercooler for processing exhaust gases and superior thermal management for uninterrupted performance in hot climates.
• Direct injection system for enhanced fuel economy and reliable cold starts.
• Marine gear compatibility (common ratios: 2.92–3.3) for flexible propulsion setups.
• Service-friendly design with availability of replacement filters, injectors, bearings, and turbo components.

Komatsu marine engines combine large displacement, long-stroke design, turbocharged efficiency, and durable mechanical systems to provide reliable propulsion in the most severe marine environments. The power-to-weight ratios, multiple duty ratings, and availability of OEM parts make them a trusted choice for fishing fleets, workboats, and transport vessels worldwide.

Are you looking to upgrade to a Komatsu marine engine or genuine replacement spare parts?

Contact us today to request a quote or check product availability.

Whether you need a new engine, repower solutions, or OEM spare parts, the Alfa Marine Spare Parts team can deliver the right Komatsu solution at competitive prices and fast shipping services.

Get in touch now and secure the high-quality Komatsu marine solutions your vessel deserves!