World first for
single-engine-single-shaft vessels
Compatible with natural gas
in any region

Comply with environmental regulations by using both diesel and gas fuels.

The use of natural gas is now attracting attention within the marine engine sector, both as a means of addressing fluctuating fuel costs, and as a way of reducing the burden on the environment. Basing on our reliable engines that will improve life cycle value for our customers, YANMAR have developed a dual fuel engine that can use both diesel and gas, which complies with IMO NOX Tier3 regulations as well as SOX Emission Control Area.

Outstanding performance thanks to YANMAR’s unique system.

Fuel supply mechanism

Can operate with natural gas in any region

Through real-time analysis of cylinder internal pressure together with high-speed control, this system avoids abnormal combustion (knocking) even when running on natural gases with a low methane number. Offering superior combustion stability, this engine can operate with natural gas in any region and with no output restrictions.

Switch fuels even at 100% output

Freely select which fuel to use. The system makes it possible to switch from diesel mode to gas mode during navigation, with no output restrictions. Furthermore, during emergencies the system can shift safely and instantaneously from gas mode back to diesel mode.

Main specifications


Propulsion Engines

Engine Model 6EY26DF 8EY26DF
Method of ignition Micro-pilot fuel compression
No. of cylinders 6 8
Cylinder bore×stroke (mm) 260 × 385
Displacement (L) 122.6 163.5
Engine speed (min-1) 750
Output [ Shaft ] (kW) 1533 2044
Mean effective pressure (Mpa) 2.00
Fuel Natural gas / M.D.O Natural gas / M.D.O / [H.F.O]

Auxiliary Engines

Engine Model 6EY22ALDF 6EY26LDF 8EY26LDF
Method of ignition Micro-pilot fuel compression
No. of cylinders 6 6 8
Cylinder bore × stroke (mm) 220 × 320 260 × 385
Displacement (L) 73.0 122.6 163.5
Engine speed
900 720/750
Output [Shaft] (kW) 1100 1470 1960
Mean effective pressure (Mpa) 2.01 1.92/2.00
Fuel Natural gas / M.D.O / [H.F.O]

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