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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.

3508B Marine Propulsion Engine

The 3508B marine engine features ratings from 578 bkw (786 mhp) to 1118 bkw (1521 mhp). Highlights of this marine engine include the Advanced Diesel Engine Management System II, Control Monitoring Protection System, Customer Communication Module, and Digital Voltage Regulator.

  • Specification Summary

  • Power Range 775-1500 bhp (578-1118 bkW)
  • Speed Range 1200-1925 rpm
  • Configuration Vee 8, 4-Stroke-Cycle Diesel
  • Aspiration TTA

Product Details

Power Rating

Power Range 775-1500 bhp (578-1118 bkW)

Engine Specifications

Speed Range 1200-1925 rpm
Emissions IMO I
Aspiration TTA
Bore 170.0 mm
Stroke 190.0 mm
Displacement 34.5 L
Rotation (from flywheel end) Counterclockwise or clockwise
Configuration Vee 8, 4-Stroke-Cycle Diesel

Dimensions & Weights

Minimum Dry Weight 4618.0 kg
Maximum Length 2310.0 mm
Maximum Height 1803.0 mm
Minimum Width 1703.0 mm
  • Fuel System
    •  Fuel filter, RH, with service indicators.
    •  Fuel transfer pump.
    •  Electronically controlled init injectors
  • Fuel filter, RH, with service indicators.
    • Fuel transfer pump.
      • Electronically controlled init injectors
        • Instrumentation
          •  Graphical Unit (Marine Power Display)
        • Lube System
          •  Crankcase breather, Top mounted
          •  Oil filter, RH, with service indicators
          •  Oil filler and dipstick, RH
          •  Standard sump oil pan (500 Hour oil change interval)
          •  Oil pump, gear type
        • Crankcase breather, Top mounted
          • Oil filter, RH, with service indicators
            • Oil filler and dipstick, RH
              • Standard sump oil pan (500 Hour oil change interval)
                • Oil pump, gear type
                  • Mounting System
                    •  Rails, engine mounting, ledge type, 203 mm x 203 mm (8 in x 8 in)
                  • Power Takeoffs
                    •  Accessory drive
                    •  Front housing, two-sided
                  • Protection System
                    •  A4 ECU Electronic Monitoring System provides customer programmable engine de-rate strategies to protect against adverse operating conditions
                  • A4 ECU Electronic Monitoring System provides customer programmable engine de-rate strategies to protect against adverse operating conditions
                    • General
                      •  Vibration damper and guard
                      •  Lifting eyes
                      •  Paint, Caterpillar Yellow engine with black rails
                      •  NOTE: Engines for heat exchanger cooling do NOT include heat exchanger.
                    • Flywheel and Flywheel Housing
                      •  Flywheel, SAE No. 0, 151 teeth.
                      •  Flywheel housing, SAE No. 0.
                    • Air Inlet System
                      •  Separate circuit aftercooler core, corrosion resistant coated (air side)
                      •  Air cleaner, regular duty
                      •  Dual turbochargers, 152 mm (6 in) OD straight connection
                    • Control System
                      •  Dual Caterpillar A-III Electronic Engine Control, LH with Electronic Unit Injector Fuel System
                      •  Rigid Wiring Harness (10 amp DC power required to drive Electronic Engine Control Module)
                    • Cooling System
                      •  Oil cooler
                      •  Thermostats and housing, Full open temperature 92 C (198 F)
                      •  Jacket water pump, gear driven, centrifugal
                      •  Auxiliary fresh water pump with SCAC engines
                      •  Auxiliary sea water pump, Centrifugal, Non-self-priming
                      •  Expansion tank
                    • Exhaust System
                      •  Dry gas tight exhaust manifolds with heat shields.
                      •  Dual turbochargers with watercooled bearings and heat shield.
                      •  Exhaust outlet, vertical, 203 mm (8 in) round flanged.
                    • Protection System
                      •  AIII Electronic Monitoring System provides customer programmable engine de-ration strategies to protect against adverse operating conditions
                      •  Emergency stop push button (located in Electronic Instrument Panel) Safety shutoff protection:
                    • AIII Electronic Monitoring System provides customer programmable engine de-ration strategies to protect against adverse operating conditions
                      • Emergency stop push button (located in Electronic Instrument Panel) Safety shutoff protection:
                        • Charging System
                          •  Battery Charger, 10 amp
                          •  Charging Alternators
                        • 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
                        • Flywheels & Flywheel Housing
                          • Instrumentation
                            •  PL1000T Communication Module
                            •  Customer Interface
                            •  Thermocouples
                            •  Remote Panel Display
                            •  Remote Cylinder Temperature Display
                            •  Pilot House Instrument Panels
                            •  Marine Gear Sensors
                            •  Engine Vision Display System
                          • Mounting System
                            •  Engine Supports
                            •  Vibration Isolators
                          • Power Take-Offs
                            •  Front Housing Accessories
                            •  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
                          • Air Inlet System
                            •  Remote Air Inlet Adapters
                          • Control System
                            •  Throttle Position Sensor
                            •  Throttle Position Signal Conv.
                            •  Throttle Position Sensor Removal
                            •  Local Speed Throttle Control
                            •  Throttle Synchronization
                          • Exhaust System
                            •  Exhaust Outlet
                            •  Flexible Fittings
                            •  Elbows
                            •  Flanges
                            •  Flange and Exhaust Expanders
                            •  Mufflers
                          • Exhaust Outlet
                            • Flexible Fittings
                              • Elbows
                                • Flanges
                                  • Flange and Exhaust Expanders
                                    • Mufflers
                                      • Lube & Fuel System
                                        • Lube System
                                          •  Oil Pan
                                          •  Oil Pan Accessories
                                          •  Sump Pumps
                                          •  Lubricating Oil
                                        • Oil Pan
                                          • Oil Pan Accessories
                                            • Sump Pumps
                                              • Lubricating Oil
                                                • Protection System
                                                  •  Air Inlet Shutoffs
                                                  •  Switches and Contactors
                                                  •  Explosion Relief Valve
                                                  •  Sensors
                                                • Air Inlet Shutoffs
                                                  • Switches and Contactors
                                                    • Explosion Relief Valve
                                                      • Sensors
                                                        • Spare Parts Kits
                                                          • Special Appearance
                                                            •  Special Appearance Packages with Chrome Covers
                                                            •  Chrome Plated Relief Valves
                                                            •  Black Air Cleaners
                                                            •  Yacht Class Finish
                                                          • Special Appearance Packages with Chrome Covers
                                                            • Chrome Plated Relief Valves
                                                              • Black Air Cleaners
                                                                • Yacht Class Finish
                                                                  • 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
                                                                      • Paints
                                                                        •  Special Paints
                                                                      • Packing
                                                                        •  Shrink Wrap Protection
                                                                        •  Storage Preservation with Glycol Solution/Vapor Corrosion Inhibitor
                                                                        •  Storage Preservation with Vapor Corrosion Inhibitor
                                                                        •  Export Packaging
                                                                      Built for it