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Cat® C9 ACERT Diesel Marine Propulsion Engines, with ratings of 510-575 mhp (503-567 bhp) at 2500 rpm, meet EPA Tier 2 commercial and recreational emissions standards as well as IMO II and EU IW and RCD emission standards. C9 engine rated at 575 mhp is compatible with the Zeus® Pod Drive System. This combination provides enhanced maneuverability and amazing response, giving pleasure craft owners an unparalleled level of boating enjoyment.


Power Range 503-567 bhp (375-423 bkW) 503-567 bhp (375-423 bkW) Less
Intermittent Ratings - Maximum Power 503.0 bhp 375.0 bkW Less
High Performance Ratings - Maximum Power 567.0 bhp 423.0 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

Minimum Dry Weight 2588.0 lb 1174.0 kg Less
Maximum Dry Weight 2588.0 lb 1174.0 kg Less
Minimum Length 62.0 in 1574.0 mm Less
Maximum Length 62.0 in 1574.0 mm Less
Minimum Height 39.5 in 1005.0 mm Less
Maximum Height 39.5 in 1005.0 mm Less
Minimum Width 38.1 in 969.0 mm Less
Maximum Width 38.1 in 969.0 mm Less

IMO compliant

13% more power than current C9

Caterpillar standard warranty

No visible white or black smoke

Parts and service support from worldwide dealer organization

Increased Power with ACERT Technology

-New injectors-New piston design-Crossflow cylinder head-New exhaust valves-Wastegated turbocharger-A4 electronic control module

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
  • Cooler

Exhaust System
  • Exhaust Temp Sensor
  • Watercooled Elbows

Fuel System
  • Fuel cooler
  • Flexible fuel lines

  • OEM Wiring Harness
  • Engine to Engine Harness
  • Instrument panels
  • Wiring Harness
  • Transmission Sensors

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

Mounting System
  • Vibration isolators

Power Take-Offs
  • Crankshaft pulley
  • Stub shaft

  • Damper Guard
  • Belt Guard - Alternator

  • Engine Protective Cover
  • Export Packing

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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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