A large industrial engine with various pipes and components.
A Yanmar diesel engine with various components and branding details.
A Yanmar diesel engine with various mechanical components and branding.
A detailed view of an engine with various components and hoses connected.
A large industrial engine with various pipes and components.
A Yanmar diesel engine with various components and branding details.
A Yanmar diesel engine with various mechanical components and branding.
A detailed view of an engine with various components and hoses connected.

6LY400 400HP

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SKU: web6LY400 Category:

Smooth, Robust Six-Cylinder Power for Shaft-Drive Vessels

The YANMAR 6LY400 is a 5.813 L marine diesel rated at 294 kW / 400 mhp at 3300 rpm, the lower of the two outputs in the 6LY-CR series, which comes in 400 and 440 mhp. Built on 30 years of history, the 4th generation 6LY-CR is a smooth and robust six-cylinder in-line engine for cruising, racing and light commercial applications. Its narrow, lightweight profile enables installation in the tightest engine rooms, for repowers and new builds alike. YANMAR built the series around five things: clean, interconnective, quiet, powerful and fuel efficient.

Powerful and fuel efficient. Denso common-rail direct injection with turbocharging and intercooling delivers high torque throughout the full operating range, for class-leading acceleration and top-end responsiveness, with fuel consumption optimized for longer journeys.

Clean and quiet. The 6LY400 meets EPA Tier 3 and EU RCD 2 and produces minimal emissions thanks to its advanced common-rail technology, with significantly less noise than previous 6LY generations and low-noise operation with vibration reduction.

Interconnective. Seamless integration for a more connected experience: the 6LY400 is controlled electronically by the YANMAR VC20 vessel control system, with up to four stations, and is available with the JC20 joystick for twin shaft-drive applications. It is offered for shaft drive with Kanzaki KMH61A2 or KMH61V2, or ZF280-1A gears, is certified for recreational and light-duty commercial applications, and is USCG lifeboat approved with a SOLAS option.

  • Powerful: 294 kW / 400 mhp at 3300 rpm, with high torque throughout the operating range
  • Fuel efficient: Denso common-rail injection optimized for fuel consumption on longer journeys
  • Clean: EPA Tier 3 and EU RCD 2, minimal emissions
  • Quiet: low-noise operation with vibration reduction
  • Interconnective: VC20 vessel control system with up to four stations; JC20 joystick for twin shaft drive
  • Shaft drive with Kanzaki or ZF gears, 585 kg / 1290 lb dry weight without gear

Spec sheets

Brochures

Manuals

Drawings

Specification Value
Rated output 294 kW / 400 mhp
Rated speed 3300 rpm
Configuration 6-cylinder in-line, 4-stroke, vertical, water-cooled diesel
Displacement 5.813 L / 354 cu. in
Bore x stroke 106 mm x 110 mm / 4.17 in x 4.33 in
Aspiration Turbocharged and intercooled
Fuel system Direct injection, Denso common rail
Cooling Fresh water cooled, centrifugal pump; seawater by rubber impeller pump
Alternator 12 V, 125 A
Dry weight, without gear 585 kg / 1290 lb
Dry weight, with KMH61A2 gear 661 kg / 1457 lb
Dry weight, with KMH61V2 gear 693 kg / 1527 lb
Dry weight, with ZF280-1A gear 671 kg / 1479 lb
Dimensions, L x W x H 1440 mm x 748.5 mm x 773.8 mm
Drive options Shaft (KMH61A2 / KMH61V2 / ZF280-1A gears)
Controls Electronic; VC20 vessel control system standard
Emissions compliance EU: RCD 2, EMC, IMO/GL. US: EPA Tier 3, EPA-C.

Shaft drive gears

For shaft-drive installations the 6LY400 is supplied with the marine gears below. All are hydraulic multi-disc gears. Other marine gearboxes and configurations are available on request; ask Mastry for the right match to your hull.

Gear Type Reduction ratios Gear dry weight
Kanzaki KMH61A2 8 degree down angle 1.55, 2.04, 2.43 76 kg / 168 lb
Kanzaki KMH61V2 V-drive 1.24, 1.49, 1.98, 2.43 108 kg / 238 lb
ZF280-1A Parallel or 7 degree down angle As available from ZF 73 kg / 161 lb
YANMAR VC20 vessel control system

VC20 vessel control system

YANMAR’s second-generation vessel control system for all electronically managed YANMAR engines. A J1939-based CAN-bus system with dedicated engine networks, a standard emergency back-up panel and NMEA connections for other onboard systems. Controls every engine and transmission function and displays engine alarms and diagnostic codes.

YANMAR JC20 joystick control

JC20 joystick, shaft drive

Inboard joystick system for motorboats, powerboats and catamarans with twin YANMAR common-rail engines. Press the joystick in the direction you want to move; the JC20 engages the bow thruster and adjusts engine speed for precise maneuvering.

YANMAR YD42 multi-function display

YD42 display

Compact full-color multi-function display in modern glass styling. Shows engine speed, load, oil pressure and coolant temperature alongside wind, speed, depth and AIS data, and reads YANMAR engine alarm and diagnostic codes.

YANMAR YD25 switch panel

YD25 panel

Compact switch panel with a 2.5 inch LCD showing all YANMAR engine data, alarms and diagnostic codes. Integrates with multifunction displays and glass helms, or serves as a standalone instrument on smaller vessels.

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