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The Cat 3512C marine propulsion engine makes your investment work harder. Through a wide range of available power 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 Range 1340-2366 bhp (1000-1765 bkW) 1340-2366 bhp (1000-1765 bkW) Less


Speed Range 1600-1800 rpm 1600-1800 rpm Less
Emissions EPA Tier 3, IMO II EPA Tier 3, IMO II Less
Aspiration TTA TTA Less
Bore 6.69 in 170.0 mm Less
Stroke 8.46 in 215.0 mm Less
Displacement 3574.0 in3 58.6 L Less
Rotation (from flywheel end) Counterclockwise Counterclockwise Less
Configuration Vee 12, 4-Stroke-Cycle Diesel Vee 12, 4-Stroke-Cycle Diesel Less

Dimensions & Weights

Minimum Dry Weight 16508.0 lb 7488.0 kg Less
Maximum Dry Weight 16508.0 lb 7488.0 kg Less
Minimum Length 104.2 in 2645.0 mm Less
Maximum Length 104.2 in 2645.0 mm Less
Minimum Height 87.5 in 2222.6 mm Less
Maximum Height 87.5 in 2222.6 mm Less
Minimum Width 80.2 in 2037.0 mm Less
Maximum Width 80.2 in 2037.0 mm Less


With phenomenal acceleration and outstanding performance the C18 proves to be a top competitor in the 1000 brake horsepower class.

Power & Acceleration

The new C18 propulsion engine has 25% more power, faster acceleration than the 3406E, and has an excellent power-to-weight ratio of 1.56 kg per metric horsepower or 3.49 lbs per brake horsepower. Even though the C18 has a slightly larger package it weighs approximately the same as the 3406E.

Electronic Control System

The ADEM III electronic control system provides engine speed governing, automatic air/fuel ratio control, engine parameter monitoring, and system diagnostics, as well as cold start strategy, engine synchronization, trolling mode strategy, and slow vessel mode. The C18 has a 70-pin customer connector compatible with the optional display systems - Marine Power Display, Marine Analog Power Display, and Engine Vision. C18 is also compatible with the Multi- Station Control System when available.

Excellent Power-to-Weight Ratio

With a 25% increase in power at approximately the same weight of the 3406E, the C18 engine has an outstanding power-to-weight ratio of 1.56 kg per metric horsepower or 3.49 lbs per brake horsepower.

Larger Bore, Stroke, and Displacement

The larger bore and stroke give the C18 24% greater displacement from a slightly larger package size than the 3406E.

Higher Capacity Fuel Injectors

Higher flow fuel injectors provide more fuel for combustion and in turn produce more power.

Faster Response

The two smaller turbochargers require less inertia to engage and thus provide more boost at lower engine speeds.

Outstanding Acceleration and Performance

This additional power provides quicker acceleration and allows the vessel to come up on plane faster.

Seawater Aftercooling and Integral Heat Exchanger System

The C18 engine has seawater aftercooling (SWAC) which also contributes to greater power output. The titanium plate heat exchanger incorporates the expansion tank, deaerators, thermostats, shunt line and crossover pipe providing a compact design.

Extremely Low Emissions

The design of the camshaft helps the engine develop higher injection pressures for lower smoke levels. The closed crankcase ventilation system removes oil vapor from the engine room.

Top Quality Appearance

High quality white urethane paint is standard with an optional superior quality

3512C HD Standard Equipment

Air Inlet System
  • Separate circuit aftercooler core, corrosion resistant coated (air side)
  • Powercore air cleaner

Control System
  • 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)

Exhaust System
  • 3500C engines:

Fuel System
  • 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

Lube System
  • Crankcase breather groups, Top mounted
  • Oil filler and dipstick, LH or RH
  • Oil pump, gear type
  • 250 or 1000 hour sump oil pan

Mounting System
  • 3500C engines:

Power Takeoffs
  • Accessory drives: Lower RH, lower LH
  • Front housing, two-sided

Protection System
  • 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 and Flywheel Housing
  • Flywheel, SAE No. 00, 183 teeth
  • Flywheel housing, SAE No. 00

Cooling System
  • 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

  • Graphical Unit (Color Marine Power Display) for analog or digital of:

3512C HD Optional Equipment

Air Inlet System
  • Air Inlet Adapters

Charging System
  • Battery Chargers
  • Charging Alternator

Control System
  • Throttle Control

Cooling System
  • Coolant Shunt Tank
  • Cooling System Options

Exhaust System
  • Flexible Fittings
  • Elbows
  • Flanges
  • Flange and Exhaust Expanders
  • Mufflers

Fuel System
  • 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

Lube System
  • Sump Pumps
  • Lubricating Oil

Power Take-Offs
  • Stub Shafts
  • Crankshaft Pulleys
  • Damper Guard
  • Flexible Coupling and Guards

Marine Society Requirements
  • Green Passport Documentation
  • Spray Shielding

Protection System
  • Shutoff and Alarm Contactors

Spare Parts Kits

Special Appearance Packages
  • Special Appearance Packages with Chrome Covers
  • Yacht Class Finish

Starting System
  • Air Starting Motor Options
  • Battery Sets - 24 Volt - Dry
  • Battery Rack

Mounting System
  • Engine Supports
  • Vibration Isolation Mountings

Transitional Vibration Analysis

  • Paint Color Options

  • Shrink Wrap Protection
  • Storage Preservation with Glycol Solution/Vapor Corrosion Inhibitor
  • Export Boxing
  • Export Packaging

Cat® Dealer Service

Buy any piece of Cat® equipment and also get the full support and commitment of your local Cat Dealer.

Contact your local dealer
Extended Warranty and Support

Caterpillar offers a variety of integrated solutions to help you protect your investment, minimize owning and operating costs, and maximize up-time.

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