MITSUBISHI S6B3‑MPTA Marine Diesel Engine

The MITSUBISHI S6B3‑MPTA is a high‑performance marine diesel engine engineered for reliable power delivery in commercial and industrial marine applications. With a rated output of 335 kW (450 HP) at 1500 rpm, this 6‑cylinder, in‑line engine combines efficient design with robust construction to provide consistent performance, fuel economy, and durability in demanding marine environments.

Built with Mitsubishi advanced diesel technology, the S6B3‑MPTA features a turbocharged and aftercooled (TA) configuration that maximizes combustion efficiency, enhances torque output, and reduces specific fuel consumption. Its rugged design mitigates vibration and noise while maintaining stable power delivery across a broad operating range, making it well‑suited for both propulsion and auxiliary power applications.

The engine efficient cooling and lubrication systems ensure optimal thermal management and protection for internal components, even during prolonged heavy‑load operation. Designed for ease of service, the S6B3‑MPTA offers accessible maintenance points that reduce downtime and help lower life‑cycle operating costs.

Ideal for medium‑sized vessels such as coastal ferries, fishing boats, workboats, tugs, and offshore support craft, the MITSUBISHI S6B3‑MPTA 450 HP engine provides a balanced combination of power, reliability, and efficiency. Supported by Mitsubishi global parts and service network, operators benefit from wide availability of components and technical support, ensuring sustained performance over the long haul.

Whether applied as a main propulsion unit or an auxiliary power source, the Mitsubishi S6B3‑MPTA engine delivers dependable power and operational resilience that marine professionals rely on.

Specifications:

• Engine Type: 6‑cylinder, in‑line, 4‑stroke marine diesel

• Model: S6B3‑MPTA

• Rated Power Output: 335 kW (≈ 450 HP)

• Rated Speed: 1500 rpm

• Aspiration: Turbocharged and aftercooled (TA)

• Fuel System: Direct fuel injection

• Displacement: Approx. 10.8 liters

• Bore × Stroke: 170 mm × 220 mm

• Compression Ratio: Approx. 14.0 : 1

• Cooling System: Freshwater cooling with heat exchanger (seawater loop)

• Lubrication System: Forced lubrication with full‑flow oil filter

• Governor: Mechanical governor (optional electronic governor available)

• Starting System: 24 V DC electric starter

• Flywheel Housing: SAE standard

• Dry Weight: Approx. 1700–1800 kg (engine only; depends on accessories)

• Dimensions (Approx. L × W × H): ~2100 × 1100 × 1400 mm

• Emission Compliance: IMO Tier II (model configuration dependent)

• Exhaust Outlet: Jacketed or dry type depending on marine setup

• Applications:

  • Main propulsion for medium‑sized vessels (workboats, tugs, fishing boats)

  • Auxiliary power and generator set duties

  • Coastal ferries and passenger craft