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Power Range1280-2551 bhp (955-1902 bkW)
Speed Range1200 rpm, 1600 rpm, 1800 rpm
EmissionsIMO II, EU IW
The Cat 3512C marine propulsion engine makes your investment work harder. Through a wide range of available power ratings (including High Displacement ratings), no required aftertreatment technology, and nominal rated BSFC fuel consumption - it will drive down your total cost of ownership. With a redesigned piston bowl shape to improve combustion, and improved fuel delivery, this engine is IMO II emissions compliant and committed to sustainable environmental development. Single-source support, the Caterpillar warranty, and industry-leading one-year warranty on parts make the 3512C a fully integrated marine power solution.


Power Range1280-2551 bhp (955-1902 bkW)
Speed Range1200 rpm, 1600 rpm, 1800 rpm
EmissionsIMO II, EU IW
Bore6.69 in (170 mm)
Stroke7.48 in (190 mm)
Displacement3161 in³ (51.8 l)
Rotation from Flywheel EndCounterclockwise or Clockwise
ConfigurationVee 12, 4-Stroke-Cycle Diesel
Minimum Length102 in (2590 mm)
Stroke - HD8.5 in (215 mm)
Displacement - HD3574 in³ (58.6 l)
Maximum Height88.3 in (2242 mm)
Maximum Length105.1 in (2669 mm)
Minimum Height75 in (1904 mm)
Minimum Width80.2 in (2037 mm)
Minimum Dry Weight14400 lb (6532 kg)
Maximum Width87.9 in (2232 mm)
Maximum Dry Weight16340 lb (7411 kg)

Benefits and Features

A wide range of power ratings available, No aftertreatment technology required, Fuel consumption nominal rated BSFC

Modified piston bowl shape to improve combustion and reduce emissions, Uses K-factor injector to align with predictive model analysis, Better electronic injection control using crank timing vs. cam timing, IMO Tier II Emissions Compliant, Lower IMAT = Lower NOx

Electronic governing (A4 ECU), Instrument panel shipped loose with Color Marine Power Display (MPD), Cold mode start strategy, Programmable low idle, Optional marine alarm and protection system

Single-source support, Caterpillar warranty for all factory packaged components, Industry-leading one-year warranty on parts

Standard Equipment

  • Separate circuit aftercooler core, corrosion resistant coated (air side)
  • Powercore air cleaner
  • Dual Caterpillar A4 Electronic Engine Control with Electronic Unit Injector Fuel System
  • Rigid Wiring Harness (10 amp DC power required to drive Electronic Engine Control Module)
  • 3500C engines:
  • Fuel transfer pump
  • Electronically Controlled Unit Injectors
  • Electronic service meter, instrument panel (24V), start/stop switch, emergency stop button, maintenance due light, diagnostic light, warning light, maintenance clear switch, start motor magnetic switch, 15 and 3A breakers
  • Graphical Unit (Color Marine Power Display) for analog or digital of:
  • Crankcase breather groups, Top mounted
  • Oil filler and dipstick, LH or RH
  • Oil pump, gear type
  • 250 or 1000 hour sump oil pan
  • Rails, engine mounting, ledge type, 203 mm x 203 mm (8 in x 8 in) or Front Trunnion
  • Accessory drives: Lower RH, lower LH
  • Front housing, two-sided
  • A4 Electronic Monitoring System provides customer programmable engine derating strategies to protect against adverse operating conditions
  • Emergency stop push button (located in Electronic Instrument Panel)
  • Safety shutoff protection:
  • Vibration damper and guard
  • Lifting eyes
  • NOTE: Engines for heat exchanger cooling do NOT include heat exchange
  • Flywheel, SAE No. 00, 183 teeth
  • Flywheel housing, SAE No. 00
  • Oil cooler
  • Thermostats and housing, Full open temperature 92 C (198 F)
  • Jacket water pump, gear driven, centrifugal
  • Auxiliary fresh water pump
  • Aftercooler system: If using glycol, up to maximum 20% glycol concentration is allowed

Optional Equipment

  • Air Inlet Adapters
  • Battery Chargers
  • Charging Alternator
  • Throttle Control
  • Coolant Shunt Tank
  • Cooling System Options
  • Flexible Fittings
  • Elbows
  • Flanges
  • Flange and Exhaust Expanders
  • Mufflers
  • Fuel Cooler Heat Exchanger - Sea Water
  • Primary Fuel Filter
  • Fuel Level Switch
  • Rigid Fuel Lines
  • Flexible Fuel Lines
  • Communication Modules
  • Color Marine Power Display System
  • Pilot House Instrument Panels
  • Marine Gear Sensors
  • Sump Pumps
  • Lubricating Oil
  • Stub Shafts
  • Crankshaft Pulleys
  • Damper Guard
  • Flexible Coupling and Guards
  • Green Passport Documentation
  • Spray Shielding
  • Shutoff and Alarm Contactors
  • Special Appearance Packages with Chrome Covers
  • Yacht Class Finish
  • Air Starting Motor Options
  • Battery Sets - 24 Volt - Dry
  • Battery Rack
  • Engine Supports
  • Vibration Isolation Mountings
  • Shrink Wrap Protection
  • Storage Preservation with Glycol Solution/Vapor Corrosion Inhibitor
  • Export Boxing
  • Export Packaging