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Cat® C9 ACERT Diesel Marine Propulsion Engine, with ratings of 510-575 mhp (503-567 bhp) at 2500 rpm, meets IMO II emission standards.


  • Power Range 503-567 bhp (375-423 bkW) 503-567 bhp (375-423 bkW)


  • Speed Range 2500 rpm 2500 rpm
  • Emissions IMO II IMO II
  • Aspiration TA TA
  • Bore 4.41 in 112.0 mm
  • Stroke 5.87 in 149.0 mm
  • Displacement 538.0 in³ 8.8 l
  • Rotation from Flywheel End Counterclockwise Counterclockwise
  • Configuration In-line 6, 4-Stroke-Cycle Diesel In-line 6, 4-Stroke-Cycle Diesel

Dimensions & Weights

  • Approximate Engine Dry Weight 2086.0 lb 946.0 kg
  • Height 38.7 in 983.0 mm
  • Length 47.2 in 1198.0 mm
  • Width - Engine 38.3 in 974.0 mm

C9 ACERT Features & Benefits

IMO compliant, Caterpillar standard warranty. no visible white or black smoke, parts & service support from worldwide dealer organization, Increased power with ACERT technology

C9 ACERT Standard Equipment

Air Inlet System

  • Aftercooler (sea water)
  • Air Cleaner/Fumes Disposal (closed crankcase) - shipped loose
  • Turbocharger

Control Panels

  • Electronic governor
  • Hydraulic Electronic Unit Injection (HEUI) fuel system
  • Electronic Control Module (ECM)
  • Engine mounted 70-pin dedicated customer connector
  • SAE J1939 data link

Cooling System

  • Thermostat and housing
  • Jacket water pump, belt driven, centrifugal
  • Auxiliary sea water pump, gear driven
  • Expansion tank (heat exchanger engines only)
  • Engine mounted heat exchanger, removable tube bundle (for sea water) (heat exchanger engines only)
  • Engine oil cooler
  • Auxiliary sea water lines
  • Transmission oil cooler

Flywheel & Flywheel Housings

  • Flywheel, SAE No. 1, 113 teeth
  • Flywheel housing, SAE No. 1

Fuel System

  • Fuel filter, RH service on Port, LH service on starboard
  • Fuel transfer pump
  • Fuel priming pump

Lube System

  • Crankcase breather
  • Oil filter, front center service
  • Oil filler, in valve cover
  • Oil level gauge, RH service on port, LH service on starboard
  • Oil pan
  • Oil pan drain, RH service on port, LH service on starboard
  • Engine oil pump (gear driven)

Mounting System

  • Front support, adjustable height

Protection System

  • Overspeed shutoff - electronic


  • Torsional vibration damper and guard
  • Lifting eyes
  • Literature
  • Engine wiring
  • RH or LH service options

C9 ACERT Optional Equipment

Cooling System

  • Coolant level sensor

Exhaust System

  • Exhaust Temp Sensor
  • Watercooled Elbows

Fuel System

  • Fuel cooler
  • Flexible fuel lines


  • OEM Wiring Harness
  • Engine to Engine Harness
  • Wiring Harness
  • Transmission Sensors
  • Marine Power Display System
  • Marine Power Display
  • Marine Power Display Bracket

Lube System

  • Oil Filler
  • Sump pumps, manual
  • Sump pump lines

Mounting System

  • Vibration isolators

Power Take-Offs

  • Crankshaft pulley
  • Damper and Stub Shaft
  • Pulley and Stub Shaft


  • Damper Guard
  • Belt Guard - Alternator


  • Engine Protective Cover
  • Export Packing

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