3512B Standard Equipment

Air Inlet System

  • 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


  • 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, service meter, fuel consumption (total and instantaneous); start/stop switch

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)

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


  • 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

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, thermostats and housing with 92° C (198° F) full open temperature

3512B Optional Equipment


  • Air Cleaner Removal
  • Remote Air Inlet Adapters


  • Battery Chargers
  • Charging Alternators


  • Throttle Position Sensor
  • Throttle synchronization


  • 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


  • Horizontal Exhaust Outlet
  • Flexible fittings
  • Elbows
  • Flanges
  • Flange and exhaust expanders
  • Mufflers


  • Fuel Cooler
  • Fuel priming pumps
  • Flexible fuel lines
  • Rigid Fuel Lines
  • Primary fuel filter
  • Fuel level switch


  • 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


  • Oil Pan
  • Oil Pan Accessories
  • Sump Pumps
  • Prelubrication Options
  • Lubricating Oil
  • Lube System


  • Engine supports
  • Vibration Isolation Mountings


  • 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
  • Front power take offs
  • Crankshaft pulleys
  • Damper guard removals


  • Air inlet shutoffs
  • Switches and contactors
  • Explosion relief valve
  • Sensors


  • Chrome Plated Relief Valves
  • Black Air Cleaners


  • Starting motors or barring device
  • Air starting motor options:
  • Starting aids
  • Battery sets - 24 volt - Dry
  • Battery rack


  • Tool set
  • Caterpillar Datalink wire

Select Units


The Cat 3512B marine propulsion 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.

Power Rating

  • Power Range 1100-2250 bhp (820-1678 bkW) 1100-2250 bhp (820-1678 bkW)

Engine Specifications

  • Speed Range 1200-1925 rpm 1200-1925 rpm
  • Emissions IMO I IMO I
  • Aspiration TTA TTA
  • Bore 6.7 in 170.0 mm
  • Stroke 7.5 in 190.0 mm
  • Displacement 3158.0 in³ 51.8 l
  • Rotation from Flywheel End Counterclockwise or Clockwise Counterclockwise or Clockwise
  • Configuration Vee 12, 4-Stroke-Cycle Diesel Vee 12, 4-Stroke-Cycle Diesel

Dimensions & Weights

  • Minimum Dry Weight 14411.0 lb 6537.0 kg
  • Minimum Length 111.0 in 2819.0 mm
  • Maximum Length 3067.0 in 121.0 mm
  • Minimum Height 71.1 in 1806.0 mm
  • Maximum Height 82.3 in 2091.0 mm
  • Minimum Width 67.1 in 1703.0 mm
  • Maximum Width 70.2 in 1785.0 mm
  • Maximum Dry Weight 14411.0 lb 6537.0 kg

Electronic Unit Injector fuel system featuring 10-20 percent higher injection pressure than other 3500 Family engines

Caterpillar ADEM II Electronic Engine Control/Monitoring System that provides infinitely variable injection timing and a state-of-the-art monitoring and protection system with self-diagnosing electronic sensors

“Deep Crater/Low Crevice Volume” twopiece articulated piston design with forged steel crown and cast aluminum skirt that enhance combustion efficiency to provide improved fuel efficiency and lower levels of gaseous and visible emissions

Larger diameter (98 mm vs. 92 mm bore) camshaft for higher injection pressures, shorter injection durations, and less gear train torsional vibration

Strengthened fuel injection actuation system and rear gear train to maintain reliability and durability while providing higher injection pressures

Center-mounted low inertia turbochargers (four on 3512B and 3516B; two on 3508B) on EPG models

Dual rear mounted turbochargers on all marine configurations

Separate circuit or sea water aftercooling to supply the optimum temperature air to the combustion chamber to reduce emissions and fuel consumption and maximize power output

Streamlined intake and exhaust manifolds to reduce parasitic pumping losses and increase combustion efficiency

Thermo-laminated heat shields on all marine configurations to maintain surface temperatures below Marine Classification Society regulations and to retain more exhaust gas energy for increased turbocharger performance

Electronic instrument panel with eight analog gauges, 10 LEDs, and one LCD read-out to display engine operating conditions and fault codes

Pin-type connector for easy connection of Caterpillar Engine Technician electronic service tool which delivers superior diagnostic capability to determine exact causes of engine faults

Formed elastomeric seals replace gaskets on rocker arm bases eliminating gasket relaxation to maintain consistent dimensions for valve lash and injection settings and nuisance-type oil leaks.

Redesigned aftercooler-to-intake manifold joints that use formed elastomeric seals and substantially fewer fasteners to give superior sealing characteristics and easier serviceability

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