3512E Tier 4 / IMO III

3512E Marine Propulsion Engine (U.S. EPA Tier 4 Final)

The 3512E marine propulsion engine is now available in a wide range of ratings that meet U.S. EPA Tier 4 Final and IMO III marine emissions regulations. As the commercial marine industry adjusts their operations to meet U.S. EPA Tier 4 Final and IMO III emissions standards, Caterpillar Marine has introduced a solution built to maximize performance while meeting regulations. Caterpillar’s combination of a fuel-efficiency-optimized engine and a selective catalytic reduction (SCR) aftertreatment system is a solution that not only reduces NOx emissions, but can also lower a customer’s owning and operating costs in the process.


Utilizes SCR Technology to enable U.S. EPA Tier 4 Final emission regulations compliance while lowering operational costs, IMO III emissions compliant

Utilizes closed loop air assisted DEF dosing control strategy

Highest efficiency mixing and control to lower operational costs, extends emissions useful life, ensures compliance, flexibility regarding urea quality

Advanced Engine Combustion Design

Advanced engine combustion design process utilizing optimum configurations and cylinder geometry for maximum engine efficiency

Enhanced control of fuel injection

Enhanced control of fuel injection optimized through crank timing and thelatest A5 ECM technology

Enhanced Fuel Delivery

Optimal fuel injector nozzle geometry and electronic injection control for improved fuel delivery

Increased Durability and Higher Engine Duty Cycle Capability

Strengthened cylinder heads and valves for increased durability and peak cylinder pressure capability resulting in higher engine duty cycle capability

Caterpillar Warranty

Industry-leading warranty coverage for factory packaged components

Global Dealer Network

No matter where or when, our extensive global dealer network is ready to provide support.

Standard Equipment

Air Inlet System
  • Corrosion-resistant aftercooler core
Control System
  • Dual A5 engine control modules with electronic unit injection and low pressure fuel system
Exhaust System
  • Dual turbochargers with water-cooled bearings and heat shields
  • Vibration damper and guard
  • Meets SOLAS regulations
Fuel System
  • Duplex Fuel and Oil Filtration
Cooling System
  • Auxiliary fresh water pump
  • Gear Driven, centrifugal jacket water pump with 40% more capacity

Additional information

Offering Type

Power Rating - Power Range

1341-2549 bhp (1000-1901 bkW)

Engine Specifications - Speed Range

1600-1800 rpm

Engine Specifications - Emissions

U.S. EPA Tier 4 Final, IMO III

Engine Specifications - Aspiration


Engine Specifications - Bore

170.0 mm ( 6.69 in )

Engine Specifications - Stroke

215.0 mm ( 8.46 in )

Engine Specifications - Displacement

58.6 l ( 3574.0 in³ )

Engine Specifications - Rotation from Flywheel End


Engine Specifications - Configuration

Vee 12, 4-Stroke-Cycle Diesel

Dimensions & Weights - Minimum Dry Weight

8176.0 kg ( 18025.0 lb )

Dimensions & Weights - Minimum Length

2624.0 mm ( 104.2 in )

Dimensions & Weights - Maximum Length

3184.0 mm ( 125.4 in )

Dimensions & Weights - Minimum Height

2335.0 mm ( 91.9 in )

Dimensions & Weights - Maximum Height

2335.0 mm ( 91.9 in )

Dimensions & Weights - Minimum Width

1808.0 mm ( 71.2 in )

Dimensions & Weights - Maximum Width

2081.0 mm ( 81.9 in )

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