Reliable and Safe Marine Performance

The Weichai 12M55 1493–2536 kW marine engine features a high-strength design for core components such as the engine block, pistons, and bearings, ensuring stable reliability even under high explosion pressure. Supported by Weichai’s global supplier network, every key part maintains consistent quality. The engine passes strict bench testing and “three-high” validation to secure reliable performance, and its overhaul interval can exceed 20,000 hours. Both the cooling and lubrication systems include emergency interfaces to enhance operational safety. In addition, the engine integrates a complete self-diagnosis system and a well-defined fault-protection strategy to safeguard the entire unit during marine operation.

Strong Power with Quick Response

The electronic control unit manages injection timing and pressure with high precision. As a result, the engine maintains high injection pressure, low speed fluctuation, and strong overall performance. Its low-speed, high-torque design offers an 18% torque reserve, enabling fast acceleration and quicker response during changing sea conditions and heavy-load situations.

Fuel Efficient for Lower Operating Costs

The optimized injection strategy allows precise control of injection pressure, quantity, and timing. Fuel atomizes more completely, giving the engine a wide economic operating range. With this refined combustion process, the minimum fuel consumption rate reaches 190 g/kW·h, helping owners reduce long-term voyage costs.

Comfortable, Quiet, and Environmentally Friendly

The 12M55 engine supports multiple injection events such as pre-injection and post-injection, which reduce noise and vibration by up to 20% compared with mechanical pump systems. Water-cooled exhaust manifolds and water-cooled exhaust outlet pipes help lower the engine-room temperature, improving onboard comfort. At the same time, the engine meets IMO Tier II and China Stage II emission requirements, supporting cleaner and more sustainable marine operation.

Highly Practical for Marine Applications

To meet different customer needs, the engine offers optional LCD smart instrument clusters, vibration-isolating mounts, hand-priming pumps, and more. Its modular structure and compact layout simplify installation within the engine room. A side inspection port allows quick maintenance, while the overall design remains clean and efficient. The control strategy can be adjusted to align with various performance demands, and the ECU supports multiple input and output signals for modern automation systems.