The new 4JH series of marine diesel engines from Yanmar were released in 2014. Developed based on 30 years of experiences with the previous JH series of marine engines, the new engines are based on Yanmar’s new TNV series of industrial diesel engines and incorporate proprietary control logic for marine propulsion engines. 

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.

Specifications

• Rated Output : 41.9 kW / 57 mhp
• Rated Speed : 3000 rpm
• Displacement : 2.19 L / 134 cu. in
• No. of cylinders : 4 cylinders
• Cylinder Bore x Stroke : 88 mm x 90 mm / 3.46 in x 3.54 in
• Combustion system : Direct Injection, Bosch Common Rail System
• Aspiration : Natural
• Alternator : 12V - 125A
• Dry weight without gear : 220 kg / 485 lbs
• Dimensions : 870 mm x 589 mm x 627 mm
• Controls : Mechanical (optional - VC10 system)
• Certifications : RCD 2 EPA Tier 3 EPA Tier 3C BSO II EMC SOLAS

NOTE:

1 kW = 1.3596 mhp = 1.34102 bhp
Fuel condition: density at 15°C = 0.842 g/cm³
Technical data is according to (ISO 8665) / (ISO 3046)
Fuel temperature 40°C at the inlet of the fuel injection pump (ISO 8665)
Length includes KM35P marine gear
(Dimensions may vary with other gears/elbow)

Standard Engine Package

• Exhaust mixing elbow [L-type]
• Alternator 12V – 125A
• B25 panel
• Flexible mounts
• Mechanical throttle sensor
• Fuel pre-filter with water separator
• Fresh water expansion tank
• Belt safety cover

Optional Accessories

• High-riser mixing elbow [instead of L-elbow]
• Secondary alternator 12V – 125A or 24V – 60A
• C35 panel
• Extension harness [3m, 5m, 10m]
• Second station
• TFX Sidemount control head
• VC10 Vessel Control System
• NMEA2000 Engine monitoring system
• Semi 2-pole
• SOLAS including Certificate [factory fit only]
• Hot water kit with cocks
• Extension saildrive leg [75 mm]
• Propeller cone nut kit SD60
• On-board spare parts kit