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Auxiliary 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.

3512E Marine Auxiliary/DEP Engine (U.S. EPA Tier 4 Final)

The 3512E marine auxiliary engine is now available in a wide range of ratings that meet U.S. EPA Tier 4 Final and IMO III marine emissions regulations. As the commercial marine industry adjusts their operations to meet U.S. EPA Tier 4 Final and IMO III emissions standards, Caterpillar Marine has introduced a solution built to maximize performance while meeting regulations. Caterpillar’s combination of a fuel-efficiency-optimized engine and a selective catalytic reduction (SCR) aftertreatment system is a solution that not only reduces NOx emissions, but can also lower a customer’s owning and operating costs in the process.

  • Specification Summary

  • Power Range 732-2399 bhp (546-1789 bkW)
  • Aspiration TA
  • Emissions U.S. EPA Tier 4 Final, IMO III
  • Bore 170 mm

Product Details

Power Rating

Power Range 732-2399 bhp (546-1789 bkW)

Engine Specifications

Aspiration TA
Emissions U.S. EPA Tier 4 Final, IMO III
Bore 170 mm
Displacement 58.6 l
Stroke 215 mm
Rotation from Flywheel End Counterclockwise
Configuration Vee 12, 4-Stroke-Cycle Diesel

Dimensions & Weights

Maximum Width 2081 mm
Minimum Width 1808 mm
Maximum Height 2335 mm
Minimum Height 2335 mm
Minimum Dry Weight 8176 kg
Maximum Length 2624 mm
Minimum Length 2624 mm
  • Air Inlet System
    •  Corrosion-resistant aftercooler core
  • Control System
    •  Dual A5 engine control modules with electronic unit injection and low pressure fuel system
  • Dual A5 engine control modules with electronic unit injection and low pressure fuel system
    • Exhaust System
      •  Dual turbochargers with water-cooled bearings and heat shields
    • General
      •  Vibration damper and guard
      •  Meets SOLAS regulations
    • Vibration damper and guard
      • Meets SOLAS regulations
        • Fuel System
          •  Duplex Fuel and Oil Filtration
        • Cooling System
          •  Auxiliary fresh water pump
          •  Gear Driven, centrifugal jacket water pump with 40% more capacity
        • Plate-type heat exchanger with integrated SCAC and JW Water expansion tanks
          • Special appearance packages with chrome covers
            • Marine society certifications
              • Power take-off
                • Certified marine alarm and protection safety system
                  • Standard instrument panel with color touchscreen display
                    • Mounting rails and trunnion mount options
                      • Engine mounted fuel cooler (SCAC Water Cooled)
                        • Sea water pump with 25% more capacity for cooling auxiliary vessel equipment
                          • Closed crank case ventilation

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