Yanmar common-rail 6LY diesels

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Producer:	Yanmar (JP)

Yanmar Marine International (YMI) is showing its entirely new range of common-rail fuel injected marine diesel engines rated for leisure marine and workboat applications. Topping the bill of new inboards is its in-line six-cylinder is rated at 440 mhp at 3,300 rpm. This new unit will also be offered in a 400 mhp version and will go into full production early in 2016.

Although new, the 6LY440 and 6LY400 have a distinguished pedigree derived from the mechanically controlled 6LY2A engine series. During its nearly 20-year long production run it was bought by thousands of performance-cruiser owners around the world, earning an enviable reputation for quiet and smooth operation, fuel efficiency and reliability.

The new engines inherit their predecessors' narrow and lightweight block whose compact profile enabled it to be installed in small cramped engine rooms. Nearly all else is new, however. Single mechanical injector units are replaced by a Denso digitally-controlled common-rail fuel injection system with new pipe work designed to cope with higher injection pressures. The 24-valve cylinder head is all-new too, as is the inlet and exhaust manifold designed for optimal engine breathing and high torque output throughout the engine's operating range.

The electronically managed engine is also designed with all the benefits of plug-and-play operation, using Yanmar's Vessel Control System (VCS) which gives the options of wireless controls and fingertip low-speed manoeuvring with the company's advanced joystick.

"The new common-rail 6LY engines build on the Yanmar tradition of producing state-of-the-art compact and powerful marine diesels that are class-leading in performance, fuel-efficiency, low emissions, and smooth, quiet and dependable running," says Floris Lettinga, YMI Global Sales Manager. "The 440 mhp version has a power-to-weight ratio of 1.7:1 (kW per kg) and is not only an advance over that of the previous 6LY models, but is also ahead of the like-for-like engines all of its major competitors in the leisure marine propulsion market today."

The 6LY serie meets the latest EPA Tier3 and upcoming EU RCD (2017) emissions requirements.

Rated output 324 kW / 440 mhp
Rated Speed 3300 rpm
Displacement 5.813 ltr [354.0 cu in]
Cylinders 6 in-line
Bore x Stroke 106 mm x 110 mm
Type 4-stroke, vertical. water cooled diesel engine

Photo: Yanmar