C12.9 Optional Equipment


  • 24V 120 amp
  • 24V 160 amp
  • 12V 200 amp

Electric starting motor

  • 12V
  • 24V

Power Density

High power density

Electronic control system

Industry-leading torque and throttle response at low speed


Smooth, quiet operation throughout the entire operating range

Ventilation system

Closed crankcase ventilation system improves engine room cleanliness

Common rail fuel system

Common rail fuel system enables optimum combustion, low emissions and reduced noise

Engine Control Panel

Available on-engine control panel with “Start,” “Stop,” and display for engine diagnostics

Inlet Air Heater

Inlet air heater for improved cold weather startability


Low maintenance (fresh water/coolant) aftercoolers

Electrical Advantages

12V or 24V electrical system

Remote Monitoring

gplink ready for remote engine and vessel monitoring

Select Units


The C12.9 marine propulsion engine is ideal for high performance marine applications including yachts, fishing vessels, military vessels, governmental vessels and various other commercial high performance marine applications. The C12.9 is designed to be integrated with both the Cat Three60 Precision Control shaft line maneuvering and engine control solution as well as other marine industry throttle controls. The electronically-controlled C12.9 is offered in two power ratings: 850 mhp at 2300 rpm and 1000 mhp at 2300 rpm. Both ratings meet EPA Tier 3, IMO II, EU Recreational Craft Directive and EU Stage IIIA regulations. In addition to high power density, the C12.9 offers high torque at low engine speeds and fast acceleration throughout the entire engine speed range due to its air system design of integrated series turbochargers and a supercharger.


  • Power Range 850-1000 mhp, 838-985 bhp, 625-735 bkW 850-1000 mhp, 838-985 bhp, 625-735 bkW


  • Speed Range 2300 rpm 2300 rpm
  • Emissions EPA Tier 3, IMO II, EU Stage IIIA EPA Tier 3, IMO II, EU Stage IIIA
  • Aspiration TA TA
  • Bore 5.31 in 135.0 mm
  • Stroke 5.9 in 150.0 mm
  • Displacement 787.0 in³ 12.9 l
  • Rotation from Flywheel End Counterclockwise Counterclockwise
  • Configuration In-line 6, 4-Stroke-Cycle Diesel In-line 6, 4-Stroke-Cycle Diesel

Dimensions & Weights

  • Height - Engine 42.7 in 1085.0 mm
  • Length - Engine 57.6 in 1463.0 mm
  • Width - Engine 43.7 in 1110.0 mm
Customer Stories

Discover what’s new and how customers like you are benefiting from our products and services. Check back often for updates.


Looking for that perfect piece of used equipment to complement your fleet? Check out our Used Exclusives, featuring new machines every week!


Let’s talk. Connect with us on one of our social channels to start the conversation and see what we’re up to.

Branch Locator

Looking for your nearest branch? Get in touch with us today by contacting one of our branches directly. We’re always ready to help.


When you choose Finning, you have a wide array of support and specialty services to help you get the most from your equipment.


Integrated technology can help you understand your equipment's output and help extend its lifespan.


Choose from a range of financing solutions that allow you to purchase equipment, parts, services, and technology when you need it.

Please share your feedback on!

Close window

We are committed to providing you with the best site experience possible.  Please take our brief survey to tell us how we are doing.

Thank you in advance for your time!