Marine diesel engine yanmar for boat

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About marine diesel engine yanmar for boat

Types of Yanmar marine diesel engines for boats

For a long time, Yanmar marine diesel engines have been the go-to choice for big boats and working ships. They are trusted for their strength, long life, and ability to work hard without stopping. Yanmar knows that different boats have different needs, so they provide a wide range of engine sizes to fit everything from big commercial ships to smaller leisure and fishing boats. What sets Yanmar apart from the rest of the brands is the advanced technology it employs in making a marine diesel engine. There is excellent fuel efficiency, which means the engine can use every drop of fuel to get the most power. Also, these engines meet strict global standards for cutting down on pollution, making them friendly to the ocean environment.

Recent developments in the Yanmar marine diesel engine ensure that users get a dependable and hassle-free boating experience. The engine has a very quiet operation so the crew will have a smooth and peaceful ride without any disruptive noise. The use of high-quality parts guarantees that there is no quick wear and tear, reducing the need for frequent repairs and servicing. Plus, each engine model is made to fit perfectly in a boat, making installation simple and easy.

  • Common Rail System: This applies to the 4HY, 4JH, and 6JH models. In engines with this system, fuel is injected into a specific cylinder under high pressure. This high pressure ensures that fuel combustion is more effective, improving the engine's fuel economy. Because of efficient use of fuel, ships can sail for longer distances with a single fuel tank.
  • Twin Turbo System: This applies mainly to bigger boat models like 6CXB-ET and 6AYEMW. Here, the diesel engine gets power from two turbochargers. This means the engine will produce a lot of power, suitable for fast and heavy-duty boats like commercial ships. Another benefit of the twin turbo system is the increase in fuel efficiency. Even though the engine works hard and produces more power, it uses fuel sparingly.
  • Super Clean EGR System: This feature is present in models like the 4EY17, 4EY20, and 4EY22. Super Clean EGR stands for Exhaust Gas Recirculation. In simple words, some of the engine's exhaust gas goes back into the engine while working. This process lowers the amount of nitrogen oxide (NOx) that the engine releases into the air. NOx is a pollutant formed when fuel burns at high temperatures inside the engine. By lowering NOx production, the Super Clean EGR system helps keep the air cleaner for everyone.

Specification and Maintenance

Details of Yanmar marine engines vary based on the model and type of the boat they are built for. The following specifications correspond to popular Yanmar engines for boats.

  • Horsepower and kilowatts: For sailing boats, the smaller horsepower engine works well. An 8HP Yanmar engine, for example, delivers about 6.2KW. This is a sufficient amount of energy for a boat weighing up to one ton. However, for larger boats a bigger marine diesel engine, such as a 75HP one that delivers 55.9KW, will be required. Here the energy generated will be sufficient for the boat, even in rough seas.
  • Cylinder Count: Marine Yanmar engines have a range of 2 to 4 cylinders. An engine with more cylinders will produce more power. A 4-cylinder Yanmar engine is better suited for larger boats that weigh more than 3 tons. A typical 4-cylinder engine will have a displacement of about 3,319 liters.
  • Dimensions & Weights: Dimensions and weights vary based on whether the engine is in-line or L-shape. A typical 4-cylinder engine weighs around 436 kg. It has a length of 1,076 mm, a width of 470 mm, and a height of 548 mm.
  • Fuel Consumption: Fuel consumption is high when a boat has to overcome resistance from the water and wind. On average, a Yanmar engine consumes about 1.58 liters of diesel per hour when traveling at cruising speed. This can increase to 5.1 liters at full throttle.

It is essential to maintain a marine Yanmar diesel engine properly, as neglect can shorten its lifespan and lead to huge expenses. Here are some maintenance tips:

  • Daily Inspection: Check for any indications of a coolant leak and look for a damaged belt or loose steering linkage. Ensure there is sufficient fuel and check the condition of the battery cables and terminals.
  • Weekly Inspection: Check the air cleaner element for dirt and clean it. See the engine for any signs of leakage or loose connections. Hydraulic hoses should not have cracks, and the fluid should be at the recommended level.
  • Repair or Replacements: Some parts of the engine will need to be replaced or repaired at regular intervals. These include the impeller (every two years), the engine oil and oil filter (every year), and the fuel and primary fuel strainer (every year).
  • Thorough Cleaning: To keep the engine in good condition, it must be cleaned often. Obliterate the remnants of salt buildup and spray the engine with fresh water. This will require the draining of water from parts of the engine such as the gearbox and coolant passages.
  • Get Help When Needed: Refer to the service manual before attempting to clean and wash or perform any minor repairs. If the engine breaks down, don't attempt to fix it without proper expertise. Always get professional help when needed.

Uses of Yanmar Marine Diesel Engines

The Yanmar 4LHAM engine and others like it power various kinds of boats and watercraft. They are suited for commercial fishing, pleasure boats, and workboats and for powering auxiliary equipment on larger vessels.

Here are some of the main uses of these durable marine diesel engines:

  • Commercial Fishing Boats

  • Diesel engines are the primary power source for big commercial fishing boats. Their reliability and fuel economy are crucial for long ocean trips that can last several days.

  • Workboats and Tugs

  • Yanmar marine diesel engines also power workboats, tugboats, and other support vessels. These boats need strong, dependable engines to haul heavy loads, push against currents, or navigate in busy ports. The tough design of diesel engines stands up to the constant use and variable conditions that workboats face.

  • Auxiliary Power on Large Vessels

  • Many big cargo ships, oil tankers, and ferries use Yanmar marine diesel engines as auxiliary power units. These smaller engines supply electricity and other forms of auxiliary power while the ship is at sea. They run lighting, winches, cranes, refrigerators, and other on-board equipment. Some large vessels have multiple diesel engines installed to serve as backup power. This ensures that essential machinery and systems aboard won't suddenly shut down.

  • Luxury Yachts and Cruise Ships

  • Big cruise ships and luxury yachts often depend on diesel engines for some of their on-board power. The strong output and fuel efficiency of marine diesels make them well suited to providing propulsion and generating electricity for systems like air conditioning, entertainment, and lighting on these high-end vessels.

How to Choose Marine Diesel Engine Yanmar for Boat

  • Power and Torque:

    Understand the required horsepower and torque of the boat to determine a suitable engine. The power of an engine is directly related to its size, so it is important to match the engine's size and power output to the needs of the boat.

  • Fuel Efficiency:

    Consider the fuel consumption rate per kilowatt/hour. A high fuel efficiency engine can save operating costs over time.

  • Weight:

    The engine's weight affects the boat's overall displacement and performance. A lightweight engine is preferable to maintain optimal boat speed and handling.

  • Cooling System:

    Understand how the engine cools itself. Marine diesel engines typically use raw water, sea water, or freshwater and coolant to dissipate heat. Selecting an effective and appropriate cooling system can prevent engine overheating during operation in marine environments.

  • Size to Fit:

    Measure the available space onboard the boat to determine the engine compartment dimensions. Make sure the selected engine will fit properly within the boat's structure without causing any modifications.

  • Horsepower Rating:

    Choose an engine with a horsepower rating that is well-suited for the intended use of the boat, whether it is for leisure cruising, commercial fishing, or high-performance sports. It is better to select an engine that provides a small margin of additional power rather than one that is close to its maximum capacity to avoid excessive wear and tear.

Marine diesel engine Yanmar for boat Q and A

Q: How long do diesel marine engines last?

A: Generally, marine diesel engines can last for up to 25 years if they are well maintained and serviced regularly.

Q: What is the power of a marine diesel engine?

A: The power of a marine diesel engine can vary depending on the size and type. Small boats use marine engines with 50 to 150 horsepower, while big ships may use engines with more than 10,000 horsepower.

Q: How often should a marine diesel engine be serviced?

A: It's generally recommended that marine diesel engines are serviced every 1500 hours of operation or at least once a year, whichever comes first.

Q: What is the fuel consumption of a marine diesel engine?

A: It depends on the size and type of the engine. A small marine diesel engine consumes between 3 and 5 liters per hour, while large ones consume between 20 to 30 liters per hour.