C9.3 ACERT  Well Servicing Engines

Well Service Engines C9.3 ACERT™ (Tier 4i/Stage IIIB)

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Key Specs

Maximum Rating
350 BHP
261 bkW
US EPA Tier 4 Interim, EU Stage IIIB
US EPA Tier 4 Interim, EU Stage IIIB
567.5 in³
9.3 l


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.

Product Specifications for C9.3 ACERT™ (Tier 4i/Stage IIIB)

Maximum Rating 350 BHP 261 bkW
Displacement 567.5 in³ 9.3 l
Minimum Rating 300 BHP 224 bkW
Governor and Protection Electronic (ADEM™ A4) Electronic (ADEM™ A4)
RPM 2200 r/min 1800 r/min
Aspiration Turbocharged-Aftercooled Turbocharged-Aftercooled
Flywheel and Flywheel Housing SAE 1 or SAE 2 SAE 1 or SAE 2
Flywheel Teeth 113 (SAE 1) 113 (SAE 1)
Rotation from Flywheel End Counterclockwise Counterclockwise
Stroke 5.87 in 149 mm
Bore 4.53 in 115 mm
Emissions US EPA Tier 4 Interim, EU Stage IIIB US EPA Tier 4 Interim, EU Stage IIIB
Length 45.3 in 1150 mm
Width 32.6 in 827 mm
Height 44.21 in 1123 mm
Weight 1950 lb 885 kg
Lube Oil System - Refill 31.7 gal (US) 30 l
Cooling System 23.5 gal (US) 22.2 l

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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