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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.

3512B Commercial Marine Propulsion Engine

The Cat 3512B marine engine includes the Advanced Diesel Engine Management System II, Control Monitoring Protection System, Customer Communication Module, and Digital Voltage Regulator. Benefits include improved fuel economy, reduced visible and gaseous emissions, enhanced diagnostic and monitoring capabilities, and increased rated output with no reduction in reliability.

  • Specification Summary

  • Power Range 1100-2012 bhp (820-1500 bkW)
  • Speed Range 1200-1800 rpm
  • Emissions IMO I
  • Aspiration TTA

Product Details

Power Rating

Power Range 1100-2012 bhp (820-1500 bkW)
Continuous Ratings - Maximum Power 1835 bkW
Heavy Duty Ratings - Maximum Power 2129 bkW
Maximum Continuous Ratings - Maximum Power 2282 bkW

Engine Specifications

Speed Range 1200-1800 rpm
Emissions IMO I
Aspiration TTA
Bore 170 mm
Stroke 190 mm
Displacement 51.8 L
Rotation (from flywheel end) Counterclockwise or Clockwise
Configuration Vee 12, 4-Stroke-Cycle Diesel

Dimensions & Weights

Minimum Dry Weight 1678.3 kg
Minimum Length 1503.7 mm
Maximum Length 1590 mm
Minimum Height 1069.3 mm
Maximum Height 1117.6 mm
Minimum Width 1143 mm
Maximum Width 1181.1 mm
  • Air Inlet System
    •  regular duty air cleaners, dual turbochargers, 152 mm (6 in) OD straight connection, corrosion resistant coated separate circuit aftercooler core
  • regular duty air cleaners, dual turbochargers, 152 mm (6 in) OD straight connection, corrosion resistant coated separate circuit aftercooler core
    • Control System
      •  dual Advanced Diesel Engine Management (ADEM II) modules with electronically controlled unit injectors
    • Exhaust System
      •  dry gas-tight exhaust manifolds with thermolaminated heat shields, dual turbochargers with watercooled bearings and thermo-laminated heat shields, vertical exhaust outlet, 203 mm (8 in) ID round flanged outlet
    • Fuel System
      •  electronically controlled unit injectors, RH fuel filter with service indicators, fuel transfer pump
    • Instrumentation
      •  RH electronic instrument panel with analog gauges and digital display of data for: oil and fuel pressure, oil and fuel filter differential, system DC voltage, exhaust and water temperature, air inlet restriction; digital display only for: tachometer, servi
    • RH electronic instrument panel with analog gauges and digital display of data for: oil and fuel pressure, oil and fuel filter differential, system DC voltage, exhaust and water temperature, air inlet restriction; digital display only for: tachometer, servi
      • Lube System
        •  top mounted crankcase breather, deep sump oil pan, RH oil filler and dipstick, RH oil filter, gear type oil pump
      • Mounting System
        •  ledge type engine length rails, 203 x 203 mm (8 x 8 in)
      • ledge type engine length rails, 203 x 203 mm (8 x 8 in)
        • Power Takeoffs
          •  accessory drive on standard rotation engines: lower RH, lower LH; on opposite rotation engines: upper and lower RH and upper and lower LH; twosided front housing
        • Protection System
          •  ADEM II Electronic Monitoring System with customer programmable alarm, shutdown, and deration strategies; emergency stop pushbutton
        • General
          •  front and rear lifting eyes, Caterpillar yellow paint, vibration damper and guard
        • front and rear lifting eyes, Caterpillar yellow paint, vibration damper and guard
          • Flywheel and Flywheel Housing
            •  SAE No. 00 flywheel (183 teeth) and SAE No. 00 flywheel housing
          • SAE No. 00 flywheel (183 teeth) and SAE No. 00 flywheel housing
            • Cooling System
              •  auxiliary fresh water pump on SCAC engines, non-self-priming centrifugal auxiliary sea water pump for heat exchanger engines only, expansion tank, gear-driven centrifugal jacket water pump, oil cooler, keel cooling connections for keel cooled engines, ther
            • auxiliary fresh water pump on SCAC engines, non-self-priming centrifugal auxiliary sea water pump for heat exchanger engines only, expansion tank, gear-driven centrifugal jacket water pump, oil cooler, keel cooling connections for keel cooled engines, ther
              • AIR INLET SYSTEM
                •  Air Cleaner Removal
                •  Remote Air Inlet Adapters
              • CHARGING SYSTEM
                •  Battery Chargers
                •  Charging Alternators
              • CONTROL SYSTEM
                •  Throttle Position Sensor
                •  Throttle synchronization
              • COOLING SYSTEM
                •  Water level switch gauge
                •  Coolant level sensors
                •  Connections
                •  Keel cooling conversions
                •  Heat exchangers
                •  Auxiliary water pumps
                •  Sea water pump removal
                •  Coolant shunt tanks
                •  Air separator
                •  Marine gear cooling
              • Water level switch gauge
                • Coolant level sensors
                  • Connections
                    • Keel cooling conversions
                      • Heat exchangers
                        • Auxiliary water pumps
                          • Sea water pump removal
                            • Coolant shunt tanks
                              • Air separator
                                • Marine gear cooling
                                  • EXHAUST SYSTEM
                                    •  Horizontal Exhaust Outlet
                                    •  Flexible fittings
                                    •  Elbows
                                    •  Flanges
                                    •  Flange and exhaust expanders
                                    •  Mufflers
                                  • FUEL SYSTEM
                                    •  Fuel Cooler
                                    •  Fuel priming pumps
                                    •  Flexible fuel lines
                                    •  Rigid Fuel Lines
                                    •  Primary fuel filter
                                    •  Fuel level switch
                                  • INSTRUMENTATION
                                    •  PL1000T Communication Module
                                    •  PL1000E Communication Module
                                    •  Customer Interface Box
                                    •  Thermocouples
                                    •  Remote panel display
                                    •  Remote cylinder temperature display
                                    •  Pilot house instrument panels
                                    •  Marine gear sensors
                                    •  Engine vision display system
                                  • LUBE SYSTEM
                                    •  Oil Pan
                                    •  Oil Pan Accessories
                                    •  Sump Pumps
                                    •  Prelubrication Options
                                    •  Lubricating Oil
                                    •  Lube System
                                  • MOUNTING SYSTEM
                                    •  Engine supports
                                    •  Vibration Isolation Mountings
                                  • POWER TAKE-OFFS
                                    •  Flexible coupling and guards
                                    •  Upper left hand front location:
                                    •  Upper right hand front location:
                                    •  Upper right hand rear location:
                                    •  Lower left hand front location:
                                    •  Lower left hand rear location:
                                    •  Front housing accessory drives
                                    •  UPPER LH ACCESSORY DRIVE
                                    •  UPPER RH ACCESSORY DRIVE
                                    •  Front power take offs
                                    •  Crankshaft pulleys
                                    •  Damper guard removals
                                  • PROTECTION SYSTEM
                                    •  Air inlet shutoffs
                                    •  Switches and contactors
                                    •  Explosion relief valve
                                    •  Sensors
                                  • Air inlet shutoffs
                                    • Switches and contactors
                                      • Explosion relief valve
                                        • Sensors
                                          • SPECIAL APPEARANCE
                                            •  Chrome Plated Relief Valves
                                            •  Black Air Cleaners
                                          • STARTING SYSTEM
                                            •  Starting motors or barring device
                                            •  Air starting motor options:
                                            •  Starting aids
                                            •  Battery sets - 24 volt - Dry
                                            •  Battery rack
                                          • GENERAL
                                            •  Tool set
                                            •  Caterpillar Datalink wire
                                          • Tool set
                                            • Caterpillar Datalink wire
                                              Built for it