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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) Less


Speed Range 2500 rpm 2500 rpm Less
Emissions IMO II IMO II Less
Aspiration TA TA Less
Bore 4.41 in 112.0 mm Less
Stroke 5.87 in 149.0 mm Less
Displacement 538.0 in3 8.8 L Less
Rotation (from flywheel end) Counterclockwise Counterclockwise Less
Configuration In-line 6, 4-Stroke-Cycle Diesel In-line 6, 4-Stroke-Cycle Diesel Less

Dimensions & Weights

Length 47.2 in 1198.0 mm Less
Width of Engine 38.3 in 974.0 mm Less
Height 38.7 in 983.0 mm Less
Approx. Engine Dry Weight 2086.0 lb 946.0 kg Less

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

Cat® Dealer Service

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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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