The Yuchai YC12VC Marine Main Engine is a V-type marine diesel engine developed on a mature and proven VC-series platform. Yuchai designed this engine to meet the operating demands of offshore engineering vessels, passenger ships, and medium-sized transport vessels with displacements from 8,000 to 12,000 tons. By integrating advanced diesel engine technologies from Germany, the United States, and Japan, and by following modern European engine development processes, the Yuchai YC12VC Marine Main Engine provides stable performance, high reliability, and strong adaptability for commercial marine applications.

Energy Saving and Environmental Protection

The YC12VC marine diesel engine adopts a new-generation electronically controlled unit pump fuel system to improve fuel efficiency. In addition, it combines advanced design concepts with high- and low-temperature water cooling technology. Turbocharging with intercooling and a four-valve cylinder head design further enhance combustion efficiency. As a result, the engine meets IMO Tier II emission requirements while reducing fuel consumption and exhaust emissions.

Compact Structure

The YC12VC marine engine features a compact structure with optimized dimensions and weight. Therefore, installation becomes easier in limited engine room spaces. Furthermore, the camshaft integrates fuel injection and valve actuation into one structure, which improves layout efficiency and supports a compact overall design.

High Reliability

Yuchai equips this marine main engine with a high-strength cylinder block, a forged alloy steel crankshaft, and alloy steel connecting rods. Consequently, the structure reduces impact loads on the main bearings and enhances durability. In addition, it ensures reliable long-term operation under continuous high-load marine conditions.

Strong Load Acceptance Capability

The Yuchai YC12VC Marine Main Engine combines electronically controlled unit pump technology with an advanced turbocharging system. Therefore, it responds quickly to load changes and maintains stable speed control. Moreover, it delivers strong load acceptance, which is essential for offshore vessels and transport ships operating under variable conditions.

Easy Maintenance

Yuchai arranges the intake manifolds on both sides of the engine to improve service accessibility. Meanwhile, the one-cylinder-one-head design uses a mature and proven cylinder head platform, which simplifies inspection and routine maintenance. In addition, a proprietary turning gear mechanism further reduces service time and improves maintenance efficiency.