Yanmar KM4A Gear R 2.14 for 4JH5 – KM4AS-5

Description

Yanmar KM4A Gear R 2.14 for 4JH5 – KM4AS-5 For Sale

The Yanmar KM4A Gear R 2.14 for 4JH5 – KM4AS-5 is a genuine Yanmar marine transmission specifically engineered for selected Yanmar 4JH5 Series marine diesel engines. Featuring a 2.14:1 reduction ratio, this robust marine gearbox is designed to deliver efficient power transfer, excellent propeller performance, and dependable long-term reliability for cruising yachts, commercial vessels, and recreational marine applications.

Designed to integrate seamlessly with Yanmar’s proven 4JH5 engine platform, the KM4AS-5 marine gearbox provides an ideal balance between propeller thrust and cruising efficiency. The 2.14:1 ratio is a popular choice for vessel owners seeking strong maneuverability, smooth operation, and optimized propulsion performance across a wide range of operating conditions.

Whether you are replacing an existing transmission, undertaking a vessel repower project, or upgrading your propulsion system, the KM4AS-5 offers the durability, efficiency, and factory-engineered compatibility expected from a genuine Yanmar marine transmission.

If you are searching for a Yanmar KM4AS-5 for sale, a dependable Yanmar marine gearbox, a reliable replacement Yanmar gearbox, or a genuine Yanmar marine transmission, Yanmar Marine Experts supplies factory-original Yanmar gearboxes backed by technical expertise and worldwide shipping support.

Technical Specifications

Compatible Engines

The Yanmar KM4AS-5 is designed for selected Yanmar 4JH5 Series marine diesel engines.

Common applications include:

Compatibility should always be verified before ordering. Our technical team can review your engine model, serial number, and vessel specifications to confirm suitability.

Understanding the 2.14:1 Reduction Ratio

The 2.14:1 reduction ratio provides an excellent balance between propeller speed and thrust generation. This ratio allows the engine to operate efficiently while delivering strong propulsion performance and responsive vessel handling.

Benefits of the 2.14:1 reduction ratio include:

• Excellent cruising efficiency
• Strong propeller thrust
• Improved low-speed maneuverability
• Better docking control
• Efficient fuel consumption
• Smooth vessel operation

For many cruising vessels and sailing yachts, the 2.14:1 ratio offers an ideal combination of performance and reliability.

Designed for the Yanmar 4JH5 Series

The Yanmar 4JH5 Series remains one of the most respected marine diesel engine platforms in the industry. Known for reliability, fuel efficiency, and smooth operation, these engines are widely used in sailing yachts, trawlers, commercial vessels, and recreational boats worldwide.

The KM4AS-5 is engineered specifically to complement these engines and function as a critical component within a complete Yanmar propulsion system.

As part of the drivetrain, the gearbox contributes to:

• Efficient power transmission
• Reduced drivetrain losses
• Smooth shifting performance
• Reliable vessel maneuverability
• Long-term operational durability

For customers researching a Yanmar 4JH45 for sale, comparing Yanmar 4JH57 price options, or evaluating a Yanmar 4JH80 for sale package, selecting the correct gearbox ratio is essential to maximizing propulsion performance.

Reliable KM4A Marine Gearbox Design

The KM4A Series has earned a strong reputation among marine professionals for dependable operation and long service life. Designed to withstand demanding marine environments, the gearbox provides reliable performance under continuous load conditions.

Advantages include:

• Smooth forward and reverse engagement
• Reliable power transfer
• Compact installation design
• Long service life
• Simplified maintenance requirements

These qualities make the KM4AS-5 a trusted commercial marine gearbox and a popular choice for vessel owners seeking long-term reliability.

Why Choose a Genuine Yanmar Gearbox?

Choosing a genuine Yanmar gearbox helps ensure proper compatibility between the engine, controls, shaft system, and propeller assembly.

Benefits include:

• Factory-engineered compatibility
• Proven marine durability
• Manufacturer warranty support
• Long-term parts availability
• Reliable propulsion performance
• Simplified servicing and maintenance

For vessel owners investing in a marine repower gearbox, a replacement Yanmar gearbox, or a complete propulsion upgrade, genuine Yanmar components help maintain the integrity of the entire drivetrain.

Common Applications

The Yanmar KM4AS-5 is commonly used in:

• Cruising yachts
• Sailing vessels
• Trawlers
• Commercial boats
• Marine repower projects
• Transmission replacement projects

For operators searching for a dependable boat transmission for sale, the KM4AS-5 remains one of the most trusted options within the Yanmar gearbox range.

Support from Yanmar Marine Experts

Yanmar Marine Experts specializes exclusively in Yanmar propulsion equipment, including marine gearboxes, saildrives, diesel engines, and genuine replacement parts.

Our team assists customers with:

• Product selection
• Gearbox compatibility verification
• Repower planning
• Technical guidance
• Worldwide shipping arrangements
• After-sales support

As an experienced marine gearbox dealer, trusted marine transmission supplier, and source for Yanmar gearbox USA products, we help customers identify the correct transmission for their vessel requirements.

Availability and Ordering Information

If you are looking to buy Yanmar gearbox equipment or searching for a Yanmar KM4AS-5 for sale USA, our team can provide current stock availability, lead times, and delivery options.

The Yanmar KM4AS-5 price may vary depending on inventory availability, destination, and shipping requirements. Likewise, overall Yanmar gearbox price levels may vary based on market conditions and supply chain availability.

For customers comparing marine transmission options, we can also provide information regarding other Yanmar gearbox for sale models, gear ratios, and compatible propulsion packages.

What’s Included

When purchasing the Yanmar KM4A Gear R 2.14 for 4JH5 – KM4AS-5, your package may include:

• Genuine Yanmar KM4AS-5 Marine Gearbox
• Factory documentation
• Manufacturer warranty coverage
• Technical assistance from Yanmar Marine Experts
• Compatibility verification support

Package contents may vary depending on supply specifications.

Warranty and Technical Support

The KM4AS-5 is supplied with applicable manufacturer warranty coverage.

Our team remains available to assist with:

• Engine compatibility verification
• Gearbox selection guidance
• Reduction ratio recommendations
• Product selection support
• Worldwide logistics arrangements

Whether you are sourcing a replacement Yanmar gearbox, installing a marine repower gearbox, or upgrading a complete propulsion package, our specialists can help ensure you receive the correct solution.

Frequently Asked Questions

Is the KM4AS-5 a genuine Yanmar gearbox?

Yes. We supply only genuine Yanmar marine transmissions backed by manufacturer warranty support.

Which engines are compatible with the KM4AS-5?

The KM4AS-5 is designed primarily for selected Yanmar 4JH5 Series marine diesel engines, including the 4JH45, 4JH57, 4JH80, and 4JH110.

What does the 2.14:1 reduction ratio provide?

The 2.14:1 ratio delivers an excellent balance between thrust generation, maneuverability, cruising efficiency, and fuel economy.

Is the KM4AS-5 suitable for marine repower projects?

Yes. The KM4AS-5 is frequently selected for marine repower gearbox installations, transmission replacements, and propulsion upgrades.

How do I get the latest Yanmar KM4AS-5 price?

Contact our sales team for current pricing, stock availability, and delivery options.

Request a Quote

Interested in the Yanmar KM4A Gear R 2.14 for 4JH5 – KM4AS-5 for sale?

Contact Yanmar Marine Experts today for the latest Yanmar KM4AS-5 price, stock availability, and worldwide shipping options.

For the fastest assistance, please provide:

• Engine model
• Engine serial number
• Current gearbox model
• Vessel make and model
• Delivery destination

Our technical specialists will review your requirements and provide a tailored quotation along with compatibility guidance, availability information, and shipping options.