Cat® C6.6 ACERT™ Diesel Engine

Cat® C6.6 ACERT™ Diesel Engine

The Cat® C6.6 ACERT Industrial Diesel Engine is offered in ratings ranging from 89-205 bkW (119-275 bhp) @ 2200-2500 rpm. These ratings meet U.S. EPA Tier 3 equivalent, EU Stage IIIA 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
2200-2500 rpm

Emission Standards

U.S. EPA Tier 3 Equivalent, EU Stage IIIA Equivalent


Engine Configuration
Inline 6, 4-Stroke-Cycle Diesel
105 mm (4.13 in)
127 mm (5.0 in)
6.6 L (402.8 in³)
Turbocharged Aftercooled (TA)
Compression Ratio
Combustion System
Direct Injection
Rotation (from flywheel end)

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

929 mm (36.6 in)
668 mm (26.3 in)
797 mm (31.4 in)
Weight, Net Dry (Basic Operating Engine Without Optional Attachments)
506 kg (1116 lb)

Standard Equipment

  • Air Inlet System
    • Turbocharged
    • Air-to-Air Aftercooled
  • Control System
    • Electronic governing, PTO speed control
    • Programmable ratings
    • Automatic altitude compensation
    • Power compensation for fuel temperature
    • Programmable low and high idle and total engine limit
    • Electronic diagnostics and fault logging
    • Engine monitoring system SAE J1939 broadcast and control
    • ADEM A4 Electronic Control Unit (ECU)
  • Cooling System
    • Thermostats and housing, vertical outlet
    • Jacket water pump, centrifugal
    • Water pump, inlet
  • Exhaust System
    • Exhaust manifold, dry
    • Optional exhaust outlet
  • Flywheels And Flywheel Housing
    • Choice of SAE No. 2 or SAE No. 3 flywheel housing
  • Fuel System
    • Electronic high pressure common rail
    • Fuel filter, secondary (2 micron)
    • ACERT Technology
    • Fuel transfer pump
    • Fuel priming pump
  • Lube System
    • Crankcase breather
    • Oil cooler
    • Oil filler
    • Lube oil filter
    • Front sump oil pan
    • Oil dipstick
    • Gear driven oil pump
  • General
    • Vibration damper
    • Lifting eyes
    • Cold start capability to -20° C (-4° F)
    • Paint: Caterpillar yellow, with optional colors available at request