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The low emission footprint paired with high efficiency and reliability make the M 46 DF an ideal propulsion engine for operation inside and outside of environmental protected areas as well as waters with HFO limitations. Upcoming IMO III emission regulations, selected operation profiles and low diesel fuel costs make the M 46 DF a preferred engine regarding cost of operation.

Power Rating

Power Range 5400 - 8685 kW 5400 - 8685 kW Less

Engine Specifications

Speed Range 500 / 514 rpm 500 / 514 rpm Less
Emissions IMO II in diesel mode / IMO III in gas mode IMO II in diesel mode / IMO III in gas mode Less
Aspiration Turbocharged Turbocharged Less
Bore 18.11 in 460.0 mm Less
Stroke 24.02 in 610.0 mm Less
Rotation (from flywheel end) Counterclockwise / Clockwise Counterclockwise / Clockwise Less
Configuration 6,7,8,9 Cylinder 6,7,8,9 Cylinder Less
Swept Volume 6181.7 in3 101.3 l/cyl Less

Dimensions & Weights

Minimum Dry Weight 207234.0 lb 94.0 t Less
Minimum Length 328.0 in 8330.0 mm Less
Maximum Length 424.0 in 10768.0 mm Less
Minimum Height 202.0 in 5130.0 mm Less
Maximum Height 216.6 in 5501.0 mm Less
Minimum Width 116.6 in 2961.0 mm Less
Maximum Width 116.6 in 2961.0 mm Less

Operational Simplicity

Key attributes of the M 46 DF are class leading efficiency and loading capacity as well as the operational simplicity which is supported by a fully automated engine control.

Operation on natural gas with min. methane number of 55 possible at reduced load.

Supports HFO operation according to CIMAC H55/K55 in diesel mode.

M 46 DF Standard Equipment

Air Inlet System
  • Air intake silencer / filter

Control System
  • Load sharing unit
  • Modular Alarm Control Protection System (MACS)
  • Speed governor

Cooling System
  • Electric cooling water preheater
  • HT cooling water pump (engine driven)
  • 2-stage charge air cooler

Exhaust System
  • Exhaust gas expansion joint
  • Exhaust gas insulated manifolds
  • Turbocharger at flywheel / counter flywheel end

Fuel System
  • Fuel circulating pump (electric driven / for MDO/MGO only)
  • Fuel indicator filter
  • Fuel pressure valve (separate / for MDO/MGO only)

Gas System
  • Gas valve unit

  • Control push buttons and lamps
  • Emergency stop lever
  • Local control panel
  • Pressure and temperature indicator

Lube System
  • Dry sump
  • Lube oil plate cooler (separate)
  • Lube oil pump (engine driven)
  • Lube oil safety filter
  • Lube oil self-cleaning filter
  • Pressure regulating valve

Mounting System
  • High flexible coupling
  • Rigid mounting

Starting System
  • Electrical barring device
  • Starting air valve

  • Lifting device (rental)
  • Torsional Vibration Calculation (TVC)

M 46 DF Optional Equipment

Air Inlet System
  • Air inlet shut-off valve
  • Air intake transition piece
  • Expansion joint
  • Silencer / filter

Control System
  • Engine alarm system
  • Remote control system
  • Remote indicators (start air pressure, engine speed, etc.)
  • Starter for electric driven pumps
  • 24 DC UPS

Cooling System
  • Cooling water preheater steam / thermal oil / electrical
  • FW/SW plate cooler
  • HT cooling water pump (electric driven)
  • LT cooling water pump (electric driven)
  • Sea water cooling pump (electric driven)
  • Temperature control valve

Exhaust System
  • Exhaust gas ventilation module
  • Silencer (with or without spark arrester)

Fuel System
  • Fuel oil cooler
  • HFO final preheater
  • HFO pressure regulating valve
  • HFO self-cleaning automatic filter
  • HFO supply and booster pumps (electrical driven)
  • HFO treatment and supply modules
  • HFO viscosity control device
  • Mixing tank

Gas System
  • Gas flowmeter
  • LNG vaporizing unit

Lube System
  • Lube oil centrifuge
  • Lube oil pump (electrical driven)
  • Lube oil treatment and combined modules
  • Pre-lubricating oil pump (electrical driven)
  • Temperature control valve
  • Wet sump with dip stick

Mounting System
  • Flexible pipe connections
  • Resilient mounting

Propulsion System
  • Control system
  • Thrusters

Starting System
  • Starting air compressor
  • Starting air receiver

  • Engine PTO coupling
  • PTO alternator
  • PTO shaft on counter-flywheel side
  • Reduction gear
  • Reduction gear PTO coupling

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