Yanmar 6AYM-WST 659HP Marine Inboard Diesel Engine – Power, Efficiency & German Marine Engineering Excellence

Powered by JB Marine GmbH – Germany’s Leading Marine Diesel Engine Specialist
For those who demand unmatched performance, efficiency, and long-term reliability, the Yanmar 6AYM-WST 659HP Marine Inboard Diesel Engine represents the pinnacle of marine propulsion technology. Trusted by professional operators and commercial fleets worldwide, this Yanmar inboard diesel engine is a true workhorse—built for continuous duty, optimal fuel economy, and superior durability under the harshest marine conditions.

At JB Marine GmbH, we proudly provide Yanmar marine diesel engines and complete propulsion solutions across Germany and Europe. Whether for repowering commercial vessels, fishing trawlers, or industrial marine crafts, the Yanmar 6AYM-WST is engineered to deliver industry-leading power and reliability.

Overview: The Benchmark for Heavy-Duty Marine Diesel Performance

The Yanmar 6AYM-WST delivers an impressive 659 horsepower (485 kW) at 1900 RPM, setting a new standard for marine diesel engineering. Its 6-cylinder in-line configuration, 20.379-liter displacement, and turbocharged intercooler system ensure a smooth, powerful output—ideal for vessels requiring sustained propulsion performance.

Key Performance Features:

• 6-cylinder direct injection system for precision combustion

• Turbocharged + intercooler technology for optimal power and efficiency

• IMO Tier II emissions compliance (optional Tier III upgrade available)

• Exceptional torque characteristics for heavy-duty marine workloads

From long-distance commercial operations to high-demand industrial vessels, this Yanmar diesel engine guarantees the resilience and efficiency that marine professionals trust.

Technical Specifications

Each component is precision-engineered to meet Yanmar’s global marine standards, offering maximum uptime, reduced emissions, and dependable service life.

Complete Package from JB Marine GmbH

When purchasing the Yanmar 6AYM-WST 659HP Marine Diesel Engine from JB Marine GmbH, customers receive a complete propulsion package designed for seamless installation and operation.

Included Components:

• Genuine Yanmar 6AYM-WST engine

• Gearbox options:

  • YX-181 (2.08, 2.55, 3.03)

  • YX-180L (3.50, 4.00, 4.54)

  • YXH-240L (4.89 to 6.95 range)

• Turbocharger & intercooler assembly

• Exhaust mixing elbow

• Alternator (12V – 125A)

• Fuel pre-filter & water separator

• NMEA2000 monitoring system

• Flexible mounts & safety accessories

Every unit is inspected, tested, and supported by JB Marine GmbH’s certified technicians to ensure plug-and-play readiness for any vessel type.

Optional Accessories for Customization

Optimize your Yanmar 6AYM-WST system with premium accessories available through JB Marine GmbH:

• High-Riser Exhaust Mixing Elbow

• Front-Mounted Seawater Pump

• Secondary Alternators (12V/24V)

• Hot Water Kit with Cocks

• Sidemount Control Heads

• VC10 Vessel Control System

• IMO Tier III Upgrade Kit (available upon request)

These enhancements allow vessel operators to tailor performance, increase onboard efficiency, and maintain full compliance with modern marine environmental regulations.

Yanmar Warranty & Service Support in Germany

Every Yanmar 6AYM-WST Marine Diesel Engine sold through JB Marine GmbH is backed by:

• 2-Year Manufacturer Warranty (extendable to 5 years)

• Full coverage for materials and workmanship defects

• Expert installation & maintenance services by certified engineers

• Comprehensive availability of genuine Yanmar spare parts

JB Marine GmbH provides end-to-end support—from purchase and installation to ongoing engine servicing and technical consultation.

Common Questions About the Yanmar 6AYM-WST 659HP

What vessels is this engine best suited for?
Ideal for commercial vessels, trawlers, industrial crafts, and workboats requiring high torque and continuous-duty reliability.

How fuel-efficient is it?
The 6AYM-WST’s direct injection and turbo-intercooler combination maximizes fuel burn efficiency, lowering operational costs while maintaining power output.

Does it meet emissions standards?
Yes – compliant with IMO Tier II, with an available Tier III upgrade kit for stricter global emission zones.

Can it be used for vessel repowering projects?
Absolutely. Its compact, modular design makes it an excellent choice for repowering existing marine systems with minimal installation adjustments.

What about maintenance?
Routine oil, filter, and coolant maintenance is simple. JB Marine GmbH provides OEM spare parts and professional maintenance packages across Germany and the EU.

Explore Other Yanmar Diesel Engines at JB Marine GmbH

As an authorized distributor, JB Marine GmbH also offers a full range of Yanmar marine inboard diesel engines, including:

• Yanmar 6BY Marine Diesel Engine

• Yanmar 6HYM 315HP Inboard Diesel Engine

• Yanmar 6AYE-WST 755HP Marine Engine

• Yanmar 4JH80 Marine Diesel Engine

Each engine is precision-built to suit a variety of marine operations, from high-speed recreational craft to industrial-grade vessels.

Why Marine Professionals Choose JB Marine GmbH

As Germany’s trusted Yanmar partner, JB Marine GmbH stands apart through:

• Genuine Yanmar diesel engines and OEM components

• Competitive pricing and technical consultation

• Fast delivery throughout Germany and the EU

• Certified technical support and after-sales service

• Commitment to marine innovation and customer satisfaction

Our mission is to keep your vessel performing at its peak—efficiently, safely, and sustainably.

Contact JB Marine GmbH – Your Yanmar Diesel Engine Experts

Looking to repower your vessel or upgrade your marine propulsion system?
Contact JB Marine GmbH today to inquire about pricing, installation, and customization options for the Yanmar 6AYM-WST 659HP Marine Inboard Diesel Engine.