VM 46 DF Marine Propulsion Engine

Based on the successful M 43 C MaK medium speed engine, the M 46 DF was designed by Caterpillar Motoren, Kiel to meet and exceed the reliability and lifetime expectations of the M 43 C while maintaining its class leading position regarding operational efficiency. With its clean design, the M 46 DF does allow fast and easy access to the system and components supporting the operation, service and maintenance simplicity MaK products are known for. Designed to operate on gaseous- as well as liquid (MDO HFO) fuels, the M 46 DF will meet IMO III emission limits while operating in gas mode and injecting a small amount of ignition fuel to control combustion. Attention was paid to the customers´ demand for a safe and reliable operation at varying engine loads and gas qualities.

Power Rating

Power Range 10800 - 15440 kW

Engine Specifications

Speed Range 500 / 514 rpm
Emissions IMO II in diesel mode / IMO III in gas mode
Aspiration Turbocharged
Bore 18.11in
Stroke 24.02in
Rotation from Flywheel End Counterclockwise / Clockwise
Configuration 12,16 Cylinder
Swept Volume 6181.7in³

Dimensions & Weights

Minimum Dry Weight 352740lb
Minimum Length 387.7in
Maximum Length 470.2in
Minimum Height 200.7in
Maximum Height 201.7in
Minimum Width 153.1in
Maximum Width 158.5in

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

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