Yanmar 4LHA STP is a 240HP marine diesel engine, widely respected for its durability, efficiency, and performance in both recreational and commercial marine vessels. It belongs to Yanmar's well-known 4LHA series, which is known for delivering smooth, powerful operation while maintaining low emissions and fuel consumption.

Here’s a detailed description of the key features and attributes of the Yanmar 4LHA STP:

Engine Design

• Configuration: 4-cylinder, in-line diesel engine, turbocharged and intercooled for enhanced performance.

• Displacement: 3.455 liters (211 cubic inches), offering an optimal balance between compact size and power output.

• Power Output: Rated at 240HP (179 kW) at 3300 RPM, delivering robust torque at lower RPMs for improved acceleration and cruising efficiency.

• Cooling System: Freshwater-cooled with a heat exchanger, ensuring consistent temperature control even under heavy loads and prolonged operation.

Fuel and Emission Efficiency

• The 4LHA STP is known for efficient fuel consumption, making it a great choice for long-distance cruising or commercial use where fuel economy is crucial.

• It meets IMO (International Maritime Organization) Tier II and other emissions standards, keeping the environmental impact low while maintaining high performance.

Turbocharging and Intercooling

• Equipped with a turbocharger and intercooler, the engine enhances combustion efficiency and increases power output while keeping the size and weight of the engine manageable.

Durability and Longevity

• The engine is constructed with high-strength components designed to withstand the rigorous demands of marine use, including long operational hours at sea.

• Yanmar's extensive experience in marine diesel technology is reflected in the reliability and long service life of the 4LHA STP, with minimal maintenance requirements.

Operational Features

• Mechanical Controls: The engine uses a traditional mechanical fuel injection system, offering simplicity and reliability over more complex electronic systems.

• Compact Design: Its compact size and relatively lightweight make it easier to install in a wide range of vessel types, from sailboats to larger yachts and small commercial vessels.

Applications

• Commonly used in both recreational boats, such as power yachts and cruisers, and commercial vessels, including fishing boats, ferries, and small workboats.

• Its high torque at low RPM makes it ideal for vessels requiring strong thrust and performance in various marine environments.

Maintenance and Serviceability

• Designed for easy access to service points such as the oil filter, fuel filter, and water pump, ensuring simpler maintenance tasks.

• Global Support Network: Yanmar has a vast service network, making parts and service easily accessible worldwide.

In summary, the Yanmar 4LHA STP is a high-performance marine diesel engine that delivers reliability, fuel efficiency, and strong power output, making it suitable for a wide variety of marine applications.