Used Yanmar 4BY2-150 110HP Inboard Diesel Engine: A Complete Guide

When it comes to marine propulsion, reliability, and efficiency, few engines have earned a reputation like the Yanmar 4BY2-150 110HP inboard diesel engine. Whether you are a professional mariner, a recreational boater, or a yacht owner, investing in a used Yanmar 4BY2-150 can be a smart decision for both performance and cost-effectiveness.

In this article, we will explore everything you need to know about this robust inboard diesel engine, including its features, advantages, maintenance, and tips for buying used models.

Overview of the Yanmar 4BY2-150 110HP

The Yanmar 4BY2-150 is part of Yanmar’s 4BY series, known for its compact design, fuel efficiency, and high reliability. With a rated output of 110 horsepower, this engine is well-suited for mid-sized sailboats and motor yachts. Its diesel configuration provides excellent torque for smooth sailing and maneuvering under varying conditions.

Key Specifications:

• Engine Type: 4-cylinder, in-line, water-cooled diesel engine

• Horsepower: 110 HP

• Displacement: ~4.0 liters

• RPM Range: 3000–3200

• Fuel Consumption: Approximately 10–12 liters per hour at cruising speed

• Weight: ~420 kg (dry weight)

• Cooling System: Freshwater-cooled with heat exchanger

• Starter: 12V electric

The compact size and durability of the Yanmar 4BY2-150 make it ideal for boats where space and weight are concerns, without compromising on power and reliability.

Why Choose a Used Yanmar 4BY2-150?

Purchasing a used Yanmar inboard diesel engine can be a cost-effective alternative to buying a brand-new engine. Here are some key reasons why boat owners often choose used Yanmar engines:

1. Proven Reliability: Yanmar has a long-standing reputation for marine diesel engines that run efficiently for thousands of hours.

2. Lower Cost: A used 4BY2-150 can cost significantly less than a new engine, often providing excellent value for money.

3. Availability of Parts: Yanmar parts are widely available, making maintenance straightforward even for older engines.

4. Fuel Efficiency: Diesel engines like the 4BY2-150 consume less fuel than equivalent gasoline engines, saving money over time.

5. Resale Value: Yanmar engines maintain good resale value due to their durability and brand recognition.

Performance and Reliability

The Yanmar 4BY2-150 is designed for long-term marine use. Its high torque at low RPM allows for smooth sailing and handling, even under heavy loads or adverse sea conditions. Owners report:

• Quiet operation – minimal engine noise and vibration

• Smooth throttle response – ideal for precision maneuvering

• Durability – capable of running for thousands of hours with proper maintenance

This engine’s design also emphasizes longevity, with reinforced cylinder blocks and high-quality components engineered to resist corrosion in the marine environment.

Maintenance Tips for Used Yanmar Engines

Buying a used diesel engine requires careful attention to maintenance to ensure optimal performance. Here are some tips for maintaining your Yanmar 4BY2-150:

1. Check Oil and Filters Regularly: Change engine oil and replace fuel and oil filters every 100–150 hours of operation.

2. Inspect the Cooling System: Ensure the heat exchanger and hoses are clean and free from leaks.

3. Examine the Fuel System: Check injectors and fuel lines for blockages or wear.

4. Monitor Engine Mounts: Worn mounts can lead to vibration and misalignment issues.

5. Regularly Test the Battery and Starter: A weak battery can affect engine starting, especially in colder weather.

6. Service History: Review the previous owner’s maintenance logs for oil changes, belt replacements, and overall care.

Regular preventative maintenance can extend the life of a used Yanmar 4BY2-150 by decades.

Tips for Buying a Used Yanmar 4BY2-150

When shopping for a used inboard diesel engine, there are several important factors to consider:

• Hours of Operation: Engines with 1,500–3,000 hours are generally considered lightly used.

• Condition of Components: Inspect hoses, belts, and mounts for wear.

• Compression Test: A professional compression test can reveal the internal health of the engine.

• Previous Usage: Engines used in freshwater may experience less corrosion than those used in saltwater environments.

• Documentation: Ensure you receive all maintenance records and any warranty information available.

Buying from reputable dealers or marine engine specialists can minimize risks and give you peace of mind.

Applications of the Yanmar 4BY2-150

The 110HP output and compact design make the 4BY2-150 ideal for a variety of vessels:

• Sailboats: Provides auxiliary power for sailing and docking.

• Motor Yachts: Serves as a reliable main propulsion engine.

• Workboats: Suitable for fishing or utility boats requiring dependable diesel power.

Its combination of fuel efficiency, torque, and compact size ensures versatility across different marine applications.

Conclusion

The Used Yanmar 4BY2-150 110HP inboard diesel engine is a trusted choice for boat owners seeking performance, reliability, and cost savings. With proper maintenance and careful selection, a used 4BY2-150 can deliver years of dependable service, whether for sailing adventures, motor cruising, or commercial marine work.