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Caterpillar Marine has made significant investments in products and services for the Governmental and Defense segment. Through the help of our dealers, we are expanding our capability to provide better technical support from the design phase to the final installation and throughout the engine's life cycle.
Cat® Marine Propulsion Engines: More Power, Higher Performance, Same Quality
3512C IMO II
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.
Learn More3512E Tier 4 / IMO III
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.
Learn More3516C IMO II
The 3516C propulsion engine is available with a wide range of ratings that meet IMO II regulations without any additional aftertreatment. These engines provide efficient operation with electronic governing, cold mode start strategy, and programmable low idle to minimize fuel consumption. The 3516C engine also incorporates a closed crankcase ventilation system to lower emissions.
Learn More3516E
Building on the durability and reliability of the 3500 engine platform, Caterpillar Marine is pleased to offer an uprated version of the Cat 3516E Marine Propulsion Engine. The high-performance engine delivers 19% more rated power, lower ambient heat rejection, and improved acceleration time. With a focus on serviceability and digitalization, this product provides easier connectivity and installation. It is designed for small engine rooms with its reduction in weight & size and is an ideal solution for Tug, Governmental, and Yachting.
Learn More3516E Tier 4 / IMO III
The 3516E 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 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.
Learn MoreC12
Cat® C12 Diesel Marine Propulsion Engines, with ratings of 340-490 bhp (254-366 bkW) at 1800-2300 rpm, meet IMO II emission standards with the exception of the 497 mhp (490 bhp) rating at 2300 rpm which meets IMO I emissions standards. The C12 takes full advantage of the electronically controlled unit injection fuel system, resulting in an environmentally friendly engine with outstanding performance and fuel economy. There is also a wide range of optional equipment available to meet the needs of your marine commercial or pleasure craft application.
Learn MoreC18
The C18 ACERT marine propulsion engine has commercial application ratings of 454 - 803 bhp at 1800 - 2100 rpm that meet U.S. EPA Tier 3, IMO II, EU IWW, and China II emissions regulations. In addition to meeting the stricter EPA Tier 3 emissions, this engine now offers a fresh water aftercooled option for the commercial propulsion and auxiliary engines and genset packages. From fishing to offshore and everything in between, you can be confident that we have the solution to fit your needs.
Learn MoreC280-12
Building on the durability and reliability of the C280 engine platform, Caterpillar is pleased to offer the C280-12 engine line. The core components are the same as the existing C280, including the latest in EUI fuel system capabilities and state-of-the-art ADEM™ A3 Electronic Control Unit (ECU) features. Caterpillar® products continue to deliver more available power while delivering outstanding fuel efficiency. You can also count on long maintenance intervals and worldwide Caterpillar parts and service availability. All C280-12 engines ratings are IMO II compliant. Engines rated at 3700 bkW and 4060 bkW, with aftertreatment, are IMO 3/EPA T4 compliant.
Learn MoreC280-16
Building on the durability and reliability of the C280 engine platform, Caterpillar is pleased to offer the C280-16 engine line, now up to 6000 bkW. The core components are the same as the existing C280, including the latest in EUI fuel system capabilities and state-of-the-art ADEM™ A3 Electronic Control Unit (ECU) features. Caterpillar® products continue to deliver more available power while delivering outstanding fuel efficiency. You can also count on long maintenance intervals and worldwide Caterpillar parts and service availability.
Learn MoreC280-6
Building on the durability and reliability of the C280 engine platform, Caterpillar is pleased to offer the IMO II C280 engine line. The core components are the same as the existing C280, including the latest in EUI fuel system capabilities and state-of-the-art ADEM™ A3 Electronic Control Unit (ECU) features. Caterpillar® products continue to deliver more available power while delivering outstanding fuel efficiency. You can also count on long maintenance intervals and worldwide Caterpillar parts and service availability.
Learn MoreC32 ACERT Tier 3
The C32 ACERT marine propulsion engine is available at ratings that meet both EPA Tier 3 and IMO II emissions regulations. It has a separate circuit aftercooling system (SCAC) for A through C ratings and a seawater aftercooling system (SWAC) for D and E ratings. The C32 ACERT has seven ratings with Wide Operating Speed Range (WOSR) and extended oil change intervals. Other benefits include proven engine operating history and performance iron with thousands of validation testing hours for quality and durability. The C32 ACERT marine engine is supported by the extensive Cat global dealer network and standard warranty.
Learn MoreC32 IMO II
The C32 marine propulsion engine is available at ratings that meet IMO II emissions regulations. It has a separate circuit aftercooling system (SCAC) for A through C ratings, six ratings with Wide Operating Speed Range (WOSR) and extended oil change intervals. Other benefits include proven engine operating history and performance iron with thousands of validation testing hours for quality and durability. The C32 marine engine is supported by the extensive Cat global dealer network and Caterpillar's standard warranty.
Learn MoreC32 Tier 3 / IMO II
Cat C32 Propulsion Engine (US EPA Tier 3 / IMO II)
Learn MoreC32 Tier 4 / IMO III
Cat C32 Propulsion Engine (US EPA Tier 4 / IMO III)
Learn MoreC32B
All new from the block up and built on the proven C32 platform, the C32B marine engine delivers more power, more speed, more time on the water and more peace of mind. All that comes in a quieter package with only a 2% increase in weight compared to the previous model — making the C32B the right choice for new builds and repowers. Rated at 2025 mhp (2000 bhp) / 1491 bkW @ 2300 rpm, the C32B meets U.S. EPA Marine Tier 3 and IMO II emissions standards. With an E Tier rating, it can run at the full 2000hp up to 8% of the time.
Learn MoreC32B
With the introduction of the C32B product line in 2021, Caterpillar Marine now confirms the availability of the uprated Cat® C32B Marine Propulsion engine in 2025 mhp and 2433 mhp offerings. With 25% more peak power and high performance, this engine demonstrates great performance and efficiency, while also delivering noise reduction at lower engine speeds. This product meets IMO II and U.S. EPA Tier 3 (recreational) emissions standards and is perfectly suited for yachting applications. Governmental applications can also be a great fit for D-tier ratings. Please consult with your Cat Marine dealer regarding the use of E-tier ratings.
Learn MoreC7.1 Tier 3 / IMO II
C7.1 Marine Propulsion Engine (U.S. EPA Tier 3 / IMO II)
Learn MoreC9.3 ACERT
The C9.3 ACERT propulsion engine has a B rating of 375 bhp (280 bkW) at 1800 rpm, a C rating of 416 bhp (310 bkW) at 2100 rpm, and a D rating of 476 bhp (355 bkW) at 2300 rpm. The C9.3 propulsion, auxiliary, and generator set engines have a common rail fuel system for optimal combustion and lower emissions. Cooling system options for the propulsion and auxiliary engines include heat exchanger with sea water aftercooling, and keel with combined circuit or separate circuit aftercooling. The genset packages are available with heat exchanger, keel, or radiator cooling. These products are EPA Tier 3 and IMO II certified. In addition the propulsionengine ratings are EU Stage IIIA certified and auxiliary and gen sets are also CCNR Stage II certified.
Learn MoreCommercial Propulsion Engines
Long-term durability, high fuel efficiency, simplified service, and long-life-to-overhaul - Cat® marine engines provide maximum productivity with minimum outlay.
Learn More3512C High Displacement Marine Generator Set
Learn MoreThe C18 is the latest generator and brings commonality with our petroleum products as well as interfacing improvements. We have also taken this opportunity to add new price list options. All engine ratings and emissions certifications are the same, however we have been able to increase the power output of the generator for 12 of the 14 ratings.
Learn MoreCat® C2.2 Diesel Marine Generator Set
Learn MoreCat C280-12 Marine Generator Set
Learn MoreCat C280-16 Marine Generator Set
Learn MoreCat C280-6 Marine Generator Set
Learn MoreCat C280-8 Marine Generator Set
Learn MoreC32 ACERT generator sets incorporate a separate circuit aftercooling system (SCAC) for all configurations. The primary advantage of the SCAC systsem is reduced aftercooler corrosion since no sea water circulates through the aftercooler. Many other improvements on these engines contribute to minimizing owning and operating costs. The IMO II and EU Stage IIIA compliant ratings are available with heat exchanger or keel cooled options. Heat exchanger configurations have an optional front mounted sea water pump.
Learn MoreC32 ACERT generator sets incorporate a separate circuit aftercooling system (SCAC) for all configurations. The primary advantage of the SCAC systsem is reduced aftercooler corrosion since no sea water circulates through the aftercooler. Many other improvements on these engines contribute to minimizing owning and operating costs. The EPA Tier 3, IMO II, EU Stage IIIA compliant ratings are available with heat exchanger or keel cooled options. Heat exchanger configurations have an optional front mounted sea water pump.
Learn MoreCat C32 Generator Set, IMO III emissions certified (SCR required)
Learn MoreCat C32 Generator Set (US EPA Tier 3 / IMO II)
Learn MoreCat C32 Generator Set (US EPA Tier 4 / IMO III)
Learn MoreCat® C4.4 Diesel Marine Generator Set has three phase ratings of 50 Hertz at 38.0, 51.5, and 69.0 ekW with heat exchanger cooling and at 36.0, 49.0, and 65.0 ekW with radiator cooling that meet EU CCNR2 emissions standards. The C4.4 also has three phase ratings of 60 Hertz at 44.0, 58.5, 76.0, and 99.0 ekW with heat exchanger cooling and of 42.0, 56.0, 72.0, and 95.0 ekW with radiator cooling. C4.4 gen set is available in 12 or 24 volt as an open gen set or as an enclosed package. Single-side servicing improves ease of maintenance and lowers overall owner operating costs. The compact package size is ideal for a wide range of commercial and pleasure craft applications. These ratings also have Marine Classification Society approved packages available.
Learn MoreC4.4 (Electronic Control System)
Learn MoreC7.1 (Electronic Control System)
Learn MoreC9.3 Marine Generator Set
Learn More
Our high-performing quality marine engines and power solutions receive world-class product support backed by our global dealer network. No matter where your vessels operate, you can count on our dealers' expertise to keep your machine running productively and profitably. Find what you need to ensure your ship operates at peak performance.
Cat® Marine Digital Services enables you to improve the most critical aspects of your operations.
Award-winning ship builder, MetalCraft Marine, was approached by the Port of Corpus Christi to design and construct a robust, high-performance fire vessel. MetalCraft Marine consistently relies on Cat® engines when building new boats due to their dependability, reliability, and seamless integration into vessels.
Learn MoreWhen it comes to configuring Cat® marine engines into its workboats, Silver Ships can count on fast response times and expert support from the team at Thompson Tractor.
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