C9.3 ACERT™ (Tier 4i/Stage IIIB)


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Cat C9.3 ACERT engines are the ideal solution for your demanding operations in the oilfield. Decades of field operation and intense research and development allow Cat C9.3 ACERT engines to deliver excellent performance with low operating costs and emissions. This is an ideal engine for applications that require Tier 4 Interim or EU Stage IIIB emissions certifications. Equipment powered by C9.3 ACERT engines includes workover rigs, pump skids, acidizing units, cementing units, coil tubing units, and hydraulic power units. Cat engines are backed by the worldwide network of Cat dealers ready to support your operation with technical support, service, parts, and warranty. Cat® C9.3 ACERT™ Industrial Diesel Engine. Ratings: 224-261 bkW (300-350 bhp) @ 1800-2200 rpm meet U.S. EPA Tier 4 Interim, EU Stage IIIB 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.

General Specifications

Minimum Rating 300.0 bhp 224.0 bkW Less
Maximum Rating 350.0 bhp 261.0 bkW Less
Governor and Protection Electronic (ADEM™ A4) Electronic (ADEM™ A4) Less
RPM 2200.0 RPM 1800.0 RPM Less
Aspiration Turbocharged-Aftercooled Turbocharged-Aftercooled Less
Displacement 567.5 in3 9.3 L Less
Flywheel and Flywheel Housing SAE 1 or SAE 2 SAE 1 or SAE 2 Less
Flywheel Teeth 113 (SAE 1) 113 (SAE 1) Less
Rotation (from flywheel end) Counterclockwise Counterclockwise Less
Stroke 5.87 in. 149.0 mm Less
Bore 4.53 in 115.0 mm Less


Emissions US EPA Tier 4 Interim, EU Stage IIIB US EPA Tier 4 Interim, EU Stage IIIB Less


Length 45.3 in. 1150.0 mm Less
Width 32.6 in. 827.0 mm Less
Height 44.21 in. 1123.0 mm Less
Weight 1950.0 lb 885.0 kg Less

Capacity for Liquids

Lube Oil System (refill) 31.7 gal 30.0 L Less
Cooling System 23.5 gal 22.2 L Less


- Designed to meet 2011 U.S. EPA Tier 4 Interim and EU Stage IIIB emissions requirements. - On-engine NOx reduction system with optimized piston, ring, liner and fuel system configuration to reduce NOx while minimizing in-cylinder sooting - Aftertreatment features Clean Emissions Module, including: diesel oxidation catalyst and diesel particulate filter - Future Tier 4 Final technology solution designed to fit into current standard aftertreatment envelope, elimating the need to redesign your installation

Engine Design

- Proven reliability and durability of engine and aftertreatment - Broad operating speed range. - High power density - PTO drive options provide flexible access to auxiliary power for pumps and other needs

Low Total Cost of Ownership

- Optimized fuel consumption - Minimum 5000-hour diesel particulate filter ash service interval and 250- to 500-hour oil change intervals enable low maintenance costs

Advanced Digital Engine Management

ADEM A4 control system providing integrated ignition, speed governing, protection, and controls, including detonationsensitive variable ignition timing. ADEM A4 has improved: user interface, display system, shutdown controls, and system diagnostics.

Power Units

Engine available with factory packaged features including: - Aftertreatment - Radiator - Base - Transmission

Custom Packaging

For any petroleum application, trust Caterpillar to meet your project needs with custom factory generator sets and mechanical packages. Cat engines, generators, controls, radiators, and transmissions can be custom designed and matched in collaboration with our local dealers to create unique solutions. Custom packages are globally supported and are covered by a one year warranty after startup.

Fuel & Oil

Requires Ultra Low Sulfur Diesel (ULSD) containing a maximum of 15 ppm sulfur, and new oil formulations to support the new technology. Designed to accommodate B20 biofuel.

Optional Attachments

- Engine-Mounted Transmission Oil Cooler — integration with engine cooling system allows ease of installation and a tighter overall engine package - Engine Brakes — braking capabilities for mobile applications


- Caterpillar has a full line of engine-transmission packages that can be fully integrated with your axle, hydraulics, and operator interface. - C9 ACERT™ Cat optimized transmission matches: TH35-E61, CX31-P600

Product Support Offered Through Global Cat Dealer Network

- More than 2,200 dealer outlets - Cat factory-trained dealer technicians service every aspect of your petroleum engine - Cat parts and labor warranty Preventive maintenance agreements available for repair before- failure options - S•O•SSM program matches your oil and coolant samples against Caterpillar set standards to determine: - Internal engine component condition - Presence of unwanted fluids - Presence of combustion by-products - Site-specific oil change interval

Over 80 Years of Engine Manufacturing Experience

Ownership of these manufacturing processes enables Caterpillar to produce high quality, dependable products.

Web Site

For all your petroleum power requirements, visit

C9.3 ACERT™ (Tier 4i/Stage IIIB) Standard Equipment

Air Inlet System
  • Turbocharged Air-to-Air Aftercooled

Control System
  • Electronic control system, over-foam wiring harness, automatic altitude compensation, power compensated for fuel temperature, configurable software features, engine monitoring system SAE J1939 broadcast and control, integrated Electronic Control Unit (ECU) remote fan control

Cooling System
  • Vertical outlet thermostat housing, centrifugal water pump, guidance on cooling system design available to ensure machine reliability

Exhaust System
  • Clean Emissions Module (CEM) that includes Diesel Particulate Filter (DPF), Diesel Oxidation Catalyst (DOC), and Cat Regeneration System, optional exhaust outlet

Flywheels and Flywheel Housing
  • SAE No. 1 and SAE No. 2 flywheel housing

Fuel System
  • High pressure common rail, primary fuel filter, secondary fuel filters, fuel transfer pump, electronic fuel priming

Lube System
  • Open crankcase ventilation system, oil cooler, oil filler, oil filter, oil dipstick, oil pump (gear driven), choice of sumps (front, rear, shallow)

Power Take Off
  • SAE A, SAE B, and SAE C drives available, engine power can also be taken from the front of the engine on some applications

  • Paint: Cat yellow, vibration damper, lifting eyes

C9.3 ACERT™ (Tier 4i/Stage IIIB) Optional Equipment

Engine-Mounted Transmission Oil Cooler
  • integration with engine cooling system allows ease of installation and a tighter overall engine package

Engine Brakes
  • braking capabilities for mobile applications

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