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Cat® C7.1 ACERT™ Diesel Engine

Demanding conditions, applications and environments make the Cat® C7.1 engines the perfect solution for your severe duty equipment. With decades of diesel engine innovation and expertise behind these engines, they deliver the low operating costs and legendary Cat reliability and durability that give you a powerful advantage. More importantly, they’re backed by the world-class Cat dealer network ready to service and support every Cat industrial engine. Industries and applications powered by C7.1 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, 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. Cat® C7.1 Industrial Diesel Engines, with ratings: 129-225 bkW (172-301.8 bhp) @ 2200 rpm, meet U.S. EPA Tier 4 Final, EU Stage V emission standards. This information about Emissions describes the particular rating’s emissions technology. For more information about emissions certification, please contact your local Cat dealer.

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  • Engine Configuration In-Line 6, 4-Stroke-Cycle Diesel
  • Cooling System Capacity 15.2 L (16 qt)
  • Lube System (refill) 13-16 L (13.7-16.9 U.S. qts)
  • Length 1063.7 mm (41.9 in)

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  • Engine Configuration
    In-Line 6, 4-Stroke-Cycle Diesel
  • Cooling System Capacity
    15.2 L (16 qt)
  • Lube System (refill)
    13-16 L (13.7-16.9 U.S. qts)
  • Bore
    4.1 in
  • Stroke
    5.3 in
  • Displacement
    427.7 in³
  • Aspiration
    Turbocharged-Aftercooled (TA) or Series Turbocharged Aftercooled (TTA)
  • Compression Ratio
  • Combustion System
    Direct Injection
  • Rotation from Flywheel End
  • Engine Configuration
    In-Line 6
  • Bore
    105 mm (4.1 in)
  • Stroke
    135 mm (5.3 in)
  • Displacement
    7 L (427.7 in³)
  • Cooling System - Capacity
    15.2 L (16 qt)
  • Lube System - Refill
    13-16 L (13.7-16.9 U.S. qts)

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

  • Length
    1063.7 mm (41.9 in)
  • Width
    753-820.2 mm (29.6-32.3 in)
  • Height
    907 mm (35.7 in)
  • Weight - Net Dry (Basic Operating Engine Without Optional Attachments)
    715 kg (1576 lb)

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

  • Length
    771-918.7 mm (30.4-36.2 in)
  • Width
    714.4-793 mm (28.1-31.2 in)
  • Height
    468-643.9 mm (18.4-25.3 in)
  • Weight
    90-134 kg (198-295.4 lb)
  • Diameter
    287-337.8 mm (11.3-13.3 in)

Power Rating

  • Minimum Power
    172 HP
  • Maximum Power
    320 HP
  • Rated Speed
    2200 rpm
  • Maximum Torque
    935 lb-ft @ 1400 rpm

Emission Standards

  • Emissions
    U.S. EPA & CARB Tier 4 Final, EU Stage V

Engine Dimensions - Approximate

  • Length
    41.9 in
  • Height
    907 mm (35.7 in)
  • Length
    1063.7 mm (41.9 in)
  • Weight - Net Dry - Basic Operating Engine Without Optional Attachments
    715 kg (1576 lb)
  • Width
    753-820.2 mm (29.6-32.3 in)
  • Width
    31.4 in
  • Height
    35.9 in

Aftertreatment Dimensions - Approximate

  • Diameter
    287-337.8 mm (11.3-13.3 in)
  • Height
    453-455 mm (17.8-18.1 in)
  • Length
    610-733 mm (24-28.9 in)
  • Weight
    65-107 kg (143.3-235.9 lb)
  • Width
    623-769 mm (24.5-30.3 in)

Aftertreatment Dimensions

  • Height
    18.1 in
  • Weight
    236 lb
  • Length
    29 in

Aftertreatment Dimensions*

  • Diameter
    13.3 in


Boasting one of Caterpillar's most modular engine designs to date, the Cat C7.1 also features an engine-mounted aftertreatment that saves OEMs valuable time and space when installing into a wide variety of machines—especially industrial and construction applications. OEMs also enjoy a 20% length, 5% height and 40% weight reduction when downsizing from 9-liter platforms.

Advanced Features

The Cat C7.1 uses passive regeneration technology, so operators can continue to perform their toughest tasks, in the most severe environments, without having to wait on the engine.

Ideal Applications

Industrial, agricultural and construction applications such as: Pumps • Compressors • Chippers • Grinders • Asphalt paving equipment • Hydraulic power units • Bore rigs • Drill rigs • Tractors

Total Cost of Ownership

The benefits to downsizing are many, including an 18% decrease in overall fuel consumption when downsizing from a 6-cylinder engine. With an added 3-4% decrease in overall DEF consumption and EGR integration, the cost savings don't take long to add up.

Cat Dealer Product Support

Scheduled maintenance, five-year warranty, superior dealer service and a comprehensive global dealer support network—it’s all standard with the Cat C7.1.


Validated with thousands of hours of field testing, the Cat C7.1 is built to meet Caterpillar's strict safety standards and customers' most demanding work sites throughout the world.

Standard Equipment:

  • Air Inlet
    • 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
    • Guidance on cooling system design available through your dealer to ensure equipment reliability
  • 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
    • Innovative filter design to ensure maximum protection of the engine
  • Lube System
    • Wide choice of sumps for different applications
  • General
    • Paint: Caterpillar yellow, with optional colors available at request
  • U.s. Epa Tier 4 Final, Eu Stage V Aftertreatment/ Clean Emissions Control Equipment
    • Clean Emissions Module (CEM), consisting of Diesel Particulate Filter (DPF) and Diesel Oxidation Catalyst (DOC)
    • NOx Reduction System (NRS)
    • Selective Catalytic Reduction (SCR)
    • 3" flex pipe connection with straight, 45°, and 90° options for flexibility

Optional Equipment:

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