JH5 Series Shaftdrive 39-54mhp

Sailing Engines

Compact and Powerful, Clean and Quiet, there are mid-range three and four- cylinder diesels based on a completely redesigned engine block and new combustion system. You can enjoy more displacement, power and torque with low vibration, low noise and low emission.  Maintenance is easy and straightforward.

  • Highly efficient performance
  • Whisper quiet running
  • Powerful electrical system
  • Simple to maintain

Engine Model

  • 3JH5E   39mhp @ 3000rpm
  • 4JH5E   54mhp @ 3000rpm

Marine Gear Option

  • KM35P – Ratio 2.36 / 2.61
  • KM35A (Down Angle 7°) – Ratio 2.33 / 2.64

Below are only available for 4JH5E

  • KM4A1-5 (Down Angle 7°) – Ratio 2.14 / 2.63
  • ZF30M – Ratio 2.15 / 2.70


Compact design iron block and head feature close space cylinders to save space and weight. Extensive use of aluminium alloys in oil pan, covers, and in many parts make for good weight savings.

User friendly

Sophisticated engine mounts, a range of velvet smooth transmissions, micron-precision fuel system components, close attention to bearing tolerances and accurate balance of moving parts make for low-noise, low vibration, low emission, low downtime and easy-to-live-with engines.


Inlet swirl design improves fuel-air mix, extra high pressure fuel injection system with micron-precision injectors and close attention to coolant flow minimizes hot and cool spots – these are just some of the ways Yanmar improves combustion efficiency.


Diesels are synonymous with fuel economy. But being a Yanmar also means that long years of experience in building some of the world’s most efficient diesel, also the extensive input from our large and ultra-modern research facilities have been incorporated into every new Yanmar engine.


Long, trouble-free engine life is a common reason for choosing Yanmar. Worldwide parts backup and quick response times make for minimum downtime. These engines are again and again the favoured choice of bluewater yachtsman and boat owners the world over.