Cat® C6.6 ACERT™ Diesel Engine

Cat® C6.6 ACERT™ Diesel Engine

Cat® C6.6 ACERT Industrial Diesel Engines offer the perfect balance of durability, fuel efficiency and low emissions. Extensively tested on the job, these engines use a range of common rail fuel systems and advanced control systems to deliver maximum uptime in the harshest environment. They have proven they can handle the toughest applications and deliver superior performance that exceeds the expectations of the most demanding users. Industries and applications powered by C6.6 The Cat® C6.6 ACERT Industrial Diesel Engine is offered in ratings ranging from 89-129.4 bkW (119.3-173.5 bhp) @ 2200 rpm. These ratings met U.S. EPA Tier 4 Interim Equivalent, EU Stage IIIB Equivalent emission standards. Industries and applications powered by C6.6 ACERT engines include: Agriculture, Ag Tractors, Aircraft Ground Support, Bore/Drill Rigs, Chippers/Grinders, Combines/Harvesters, Compactors/Rollers, Compressors, Construction, Cranes, Crushers, Feller Bunchers, Forestry, Forklifts, General Industrial, Harvesters, Hydraulic Power Units, Irrigation Equipment, Loaders/Forwarders, Material Handling, Mining, Mobile Earthmoving Equipment, Mobile Sweepers, Paving Equipment, Pumps, Skidders, Specialty Ag Equipment, Sprayers, Trenchers and Underground Mining Equipment.

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Power Rating

Minimum Power
Maximum Power
Rated Speed
2200 rpm

Emission Standards

U.S. EPA Tier 4 Interim Equivalent, EU Stage IIIB Equivalent


Engine Configuration
Inline 6, 4-Stroke-Cycle Diesel
105.0 mm (4.13 in)
127 mm (5.00 in)
6.6 L (402.8 in³)
Turbocharged Aftercooled (TA)
Compression Ratio
Combustion System
Direct Injection
Rotation (from flywheel end)
Cooling System Capacity
13.7 L (14.5 qt)
Lube System (refill)
13-16 L (13.7-16.9 qt)

Engine Dimensions (Approximate. Final dimensions dependent on selected options)

1063.7 mm (41.9 in)
753 mm (29.6 in)
907 mm (35.7 in)
Weight - Net Dry (Basic Operating Engine Without Optional Attachments)
695 kg (1532 lb)

Aftertreatment Dimensions (Approximate. Final dimensions dependent on selected options)

852.7 mm (33.6 in)
364.6 mm (14.35 in)
352 mm (13.9 in)
40 kg (88.1 lb)
283 mm (11.1 in)

Standard Equipment

  • Air Inlet System
    • Standard air cleaners
  • Control System
    • Full electronic control system, all connectors and wiring looms waterproof and designed to withstand harsh off-highway environments
    • Flexible and configurable software features and well-supported SAE J1939 CAN bus enables highly integrated machines
  • Cooling System
    • Top tank temperature 108° C (226° F) as standard to minimize cooling pack size
    • 50:50 water glycol mix
  • Flywheels And Flywheel Housing
    • Wide choice of drivetrain interfaces, including SAE No. 1, SAE No. 2, and SAE No. 3 configurations
  • Fuel System
    • Electronic high pressure common rail
    • ACERT Technology
    • Innovative filter design to ensure maximum protection of the engine
  • Lube System
    • Wide choice of sumps for different applications
  • Power Take Off (pto)
    • SAE A and SAE B flanges on left-hand side. Additional SAE A flange available on left-hand side. Engine power can also be taken from the front of the engine on some applications. Factory fitted compressors are also available.
  • U.s. Epa Tier 4 Interim Equivalent, Eu Stage Iiib Equivalent Aftertreatment / Clean Emissions Control Equipment
    • Clean Emissions Module (CEM), consisting of Diesel Particulate Filter (DPF) and Diesel Oxidation Catalyst (DOC)
    • 3" flex pipe connection kit with straight, 45°, and 90° options for flexibility