4JH57 57HP

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YANMAR sailing and smaller craft engines deliver the high-end performance and unequaled reliability associated with over 100 years of innovation. Bringing common rail technology to smaller recreational and light duty commercial applications, YANMAR exclusively provides the benefits of fuel efficiency, added power, and cleaner operation to sailing and smaller crafts. With the largest global support network in the marine engine industry and delivering 5x Best in Class features associated with common rail technology, YANMAR engines have become the global standard in sailboat and small craft propulsion.

About Common Rail Technology

As a leading diesel engine manufacturer, YANMAR integrates the most advanced common rail technology into our innovative marine engines.

Common rail technology is a digitally controlled, high-pressure fuel injection and sensor system that optimizes engine efficiency & performance. This results in reduced emissions, minimal noise, and peak power output, significantly improving the engine’s overall efficiency and comfort onboard.

Multiple sensors throughout the engine intelligently feed operating conditions and performance requirements to the ECU. The system monitors the throttle position, various temperatures, rail and pressure, intake air pressures, and both crank and cam positions. Based on the feedback from the sensors, the ECU regulates fuel from the supply pump into a single high-pressure fuel rail and digitally activated injectors. This controls precisely when and how much fuel to inject. A common rail system can supply between one and five injections to each cylinder over the course of a cycle, rather than one single injection in a mechanically controlled fuel system.

Originally developed to meet strict automotive emissions regulations, the common rail technologies used in YANMAR’s marine engines have been custom marinized by YANMAR, specific to each YANMAR model and meeting YANMAR’s strict engineering standards. This brings you the latest technology in marine diesel engineering and our collection of 5x Best in Class engines.

Rated output41.9 kW / 57 mhp
Rated Speed3000 rpm
Displacement2.190 L [134 cu in]
Cylinders4 in-line
Bore x Stroke88 mm x 90 mm
Type4-stroke, vertical, water-cooled diesel engine
Emission complianceEU: RCD 2, BSO II, EMC. US: EPA TIER 3.
Warranty2 + 3 year extended warranty

For the latest manuals, product guides, spec sheets and more, please visit Yanmar Marine's product page.

SD25

  • Corrosion Protection
  • Reliable
  • Simple & Efficient
  • Whisper Quiet & Low Vibration
  • Easy Maintenance
  • User Friendly
  • Extra Protection

TypeSaildrive
Engine type [mhp]9 - 29
Reduction Ratio (fwd/asn)2.64/2.64
Reduction gear systemConstant mesh gear with dog clutch
Dry weight [kg - lbs]30 kg [66 lbs]

YD25

Compact switch panel with a 2.5” LCD display to view all YANMAR engine data, alarms, and diagnostic troubleshooting codes. Integrates with multifunction displays and glass helm systems, or can function as a standalone instrument display aboard smaller vessels.


YD42

Smart, multi-purpose instrument featuring a compact full color display, modern glass styling, with the ability to read and display YANMAR engine alarm and diagnostic troubleshooting codes. View engine speed, engine load, oil pressure, coolant temperature, wind, speed, depth, AIS data and more at a glance.


JC-20

The YANMAR JC20 inboard joystick system is suitable for every motorboat, powerboat, and catamaran equipped with twin YANMAR 6LY Series & 8LV Series common rail engines.

How it works
Simply press the joystick gently in the desired direction of movement and the JC20 will automatically engage the bow thruster and adjust the speed of the two shaft engines to maneuver the bow precisely where needed.

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