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Cat® C7 ACERT Diesel Marine Propulsion Engines, with a high performance rating of 461 mhp (455 bhp) at 2800 rpm meets EPA Tier 2 commercial and recreational, IMO II, and EU RDC emissions standards. C7 engines deliver impressive performance throughout a wide speed range with exceptional power density. The compact package size and extensive choice of options ensures these engines are ideal for applications such as small cruising vessels. Single-side servicing improves ease of maintenance and lowers overall owner operating costs.


Power Range 455 bhp (339 bkW) 455 bhp (339 bkW) Less
High Performance Ratings - Maximum Power 455.0 bhp 339.0 bkW Less


Speed Range 2800 rpm 2800 rpm Less
Emissions IMO II IMO II Less
Aspiration TA TA Less
Bore 4.33 in 110.0 mm Less
Stroke 5.0 in 127.0 mm Less
Displacement 442.0 in3 7.24 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 1760.0 lb 798.0 kg Less
Minimum Length 48.1 in 1221.8 mm Less
Maximum Length 48.1 in 1221.8 mm Less
Minimum Height 36.1 in 916.9 mm Less
Maximum Height 36.1 in 916.9 mm Less
Minimum Width 36.2 in 919.6 mm Less
Maximum Width 36.2 in 919.6 mm Less

EPA Tier 2 and IMO compliant

- Pleasure craft ratings certified to 2006 EPAMarine Tier 2 Recreational EmissionsStandards- Commercial ratings certified to 2004 EPAMarine Tier 2 Commercial EmissionsStandards

Excellent power-to-weight ratio

Little or no visible white or black smoke

Higher compression ratio than current C7, resulting in less start-up smoke

Improved transient response

Same dimensions as current C7

Standard Caterpillar warranty

Parts and service support from worldwide dealer organization

A4 Electronic Control Unit (ECU)

HEUI fuel pump

HI 315B injectors

Higher compression monosteel pistonsd

C7 ACERT Standard Equipment

Air Inlet System
  • Air inlet heater, 12 volt
  • Aftercooler (sea water)
  • Air Cleaner/Fumes Disposal (closed crankcase) - shipped loose
  • Turbocharger

Control System
  • Electronic governor
  • Hydraulic Electronic Unit Injection (HEUI) fuel system
  • A 4 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
  • Block heater right side only, 1000 watt, 120 volt AC, current draw 8.4 amps, with engine installed thermostat

Flywheels & Flywheel Housings
  • Flywheel, SAE No. 3, 126 teeth
  • Flywheel housing, SAE No. 3

Fuel System
  • Fuel filter, LH service on Starboard or RH service on Port
  • Fuel transfer pump
  • Fuel priming pump

Lube System
  • Crankcase breather
  • Oil filter, front center service
  • Oil filler, LH service on Starboard or RH service on Port
  • Oil level gauge, LH service on Starboard or RH service on Port
  • Oil pan
  • Oil pan drain, LH service on Starboard or RH service on Port
  • Lubricating oil
  • Engine oil pump (gear driven)

Protection System
  • Overspeed shutoff - electronic

  • Torsional vibration damper and guard
  • Lifting eyes
  • Engine preservation

C7 ACERT Optional Equipment

Cooling System
  • Coolant recovery tank
  • Coolant level sensor
  • Hydraulic Oil Cooler

Exhaust System
  • Elbows
  • Flexible Fitting
  • Flange
  • Mufflers

Flywheels & Flywheel Housings
  • Flywheel & Housing, SAE No. 2

Fuel System
  • Water Separator
  • Fuel cooler
  • Flexible fuel lines
  • Fuel Temperature Sensor

  • OEM Wiring Harness
  • Engine to Engine Harness
  • Instrument Panels
  • Wiring Harness
  • Transmission Sensors
  • Magnetic Pickup

Lube System
  • Sump pump, manual
  • Sump pump lines

Mounting System
  • Vibration Isolators

Power Take-Offs
  • Crankshaft Pulley

Starting System
  • Electric starting motors - 12 volt, 24 volt
  • Starting aid

  • Belt Guard Removal
  • Turbo air outlet cover

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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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