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Commercial Propulsion Engines

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 34 DF Marine Propulsion Engine

Driven by upcoming fuel sulfur and NOx regulations in Emission Control Areas (ECA), the M 34 DF provides full flexibility for vessels operating in regulated and/or lesser regulated areas without major changes to the engine room or the exhaust gas system supporting installation and certification simplicity. The M 34 DF will be capable of running on Liquid Natural Gas (LNG) as an alternative to expensive low sulfur Marine Diesel Oil (MDO) or large and complex scrubber installations for ECA operation as of 2015. High efficiency and proven reliability make the M 34 DF an excellent propulsion engine for operation in- and outside of environmental protected areas as well as waters with HFO limitations.

  • Specification Summary

  • Power Range3060-4770 bkW
  • Speed Range720 / 750 rpm
  • EmissionsIMO II
  • AspirationTurbocharged
  • Bore340 mm
  • Specification Sheet


Product Details

Power Rating

Power Range 3060-4770 bkW

Engine Specifications

Speed Range 720 / 750 rpm
Emissions IMO II
Aspiration Turbocharged
Bore 340 mm
Stroke 460 mm
Rotation (from flywheel end) Counterclockwise / Clockwise
Configuration 6,8,9 Cylinder

Dimensions & Weights

Minimum Dry Weight 39.5 kg
Minimum Length 6109 mm
Maximum Length 3869 mm
Minimum Height 4209 mm
Maximum Height 2291 mm
Minimum Width 2291 mm
  • 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
        • 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
        • Gas valve unit
          • 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
                  • 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
                              • Electrical barring device
                                • Starting air valve
                                  • General
                                    •  Lifting device (rental)
                                    •  Torsional Vibration Calculation (TVC)
                                  • Lifting device (rental)
                                    • 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
                                        •  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 self-cleaning automatic filter
                                        •  HFO pressure regulating valve
                                        •  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
                                      • 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
                                          • 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

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