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Marine Generator Sets

Industry-leading technology allows Caterpillar to create the most reliable commercial engines for a variety of applications. From tugs and container vessels to yachts and sport fishers, Cat and MaK engines have demonstrated their efficiency countless times. With remarkable reliability and durability, these engines will exceed your expectations for decades.

M 46 DF Marine Generator Set

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 reliability and lifetime expectations of its predecessor, while maintaining its class leading position regarding operational efficiency. With its clean design, the M 46 DF allows a fast and easy access to the system and components, supporting 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 meets 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.

  • Specification Summary

  • Minimum Rating5179 kWe (6480 kVA)
  • Maximum Rating8329 kWe (10422 kVA)
  • EmissionsIMO II in diesel mode, IMO III in gas mode
  • Configuration6,7,8,9 Cylinder
  • Bore460 mm
  • Specification Sheet


Product Details

Generator Set Specifications

Minimum Rating 5179 kWe (6480 kVA)
Maximum Rating 8329 kWe (10422 kVA)

Generator Set Configurations

Emissions IMO II in diesel mode, IMO III in gas mode

Engine Specifications

Configuration 6,7,8,9 Cylinder
Bore 460 mm
Stroke 610 mm
Displacement 88.6 L

Generator Set Dimensions

Weight 178 t - 240 t (392422 lbs - 529109 lbs)
Length 12202 mm - 14459 mm (480.4 in - 569.3 in)
Width 3400 mm (133.9 in)
Height 6278 mm - 6649 mm (247.2 in - 261.8 in)
  • Air Inlet System
    •  Air intake silencer / filter
  • Control System
    •  Load sharing unit
    •  Modular Alarm Control Protection System (MACS)
    •  Speed governor
  • 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
        • Electric cooling water preheater
          • HT cooling water pump (engine driven)
            • 2-stage charge air cooler
              • Exhaust System
                •  Exhaust gas expantion joint
                •  Exhaust gas insulated manifolds
                •  Turbocharger at flywheel / counter-flywheel end
              • Exhaust gas expantion joint
                • Exhaust gas insulated manifolds
                  • Turbocharger at flywheel / counter-flywheel end
                    • Gas System
                      •  Gas valve unit
                    • Fuel System
                      •  Fuel circulating pump (electric driven / for MDO/MGO only)
                      •  Fuel indicator filter
                      •  Fuel pressure valve (separate / for MDO/MGO only)
                    • Fuel circulating pump (electric driven / for MDO/MGO only)
                      • Fuel indicator filter
                        • Fuel pressure valve (separate / for MDO/MGO only)
                          • Instrumentation
                            •  Control push buttons and lamps
                            •  Emergency stop lever
                            •  Local control panel
                            •  Pressure and temperature indicator
                          • 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 flexibile coupling
                                    •  Rigid mounting
                                  • Starting System
                                    •  Electrical barring device
                                    •  Starting air valve
                                  • Electrical barring device
                                    • Starting air valve
                                      • General
                                        •  Torsional Vibration Calculation (TVC)
                                      • 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
                                        •  CW piping for generator cooling on base frame
                                        •  CW piping for lubricating oil cooler on base frame
                                        •  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)
                                      • 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
                                          • 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 system
                                                          • 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
                                                          • 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
                                                                        •  Double resilient mounting
                                                                        •  Flexible pipe connections
                                                                        •  Resilient mounting
                                                                      • Double resilient mounting
                                                                        • Flexible pipe connections
                                                                          • Resilient mounting
                                                                            • Starting System
                                                                              •  Starting air compressor
                                                                              •  Starting air receiver
                                                                            • Propulsion System
                                                                              •  Control system
                                                                              •  Thrusters
                                                                            • General
                                                                              •  Engine PTO coupling
                                                                              •  Flywheel cover
                                                                              •  PTO alternator
                                                                              •  PTO shaft on counter-flywheel side
                                                                              •  Reduction gear
                                                                              •  Reduction geat PTO coupling

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