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C9.3 ACERT™ Tier 4i/Stage IIIB Engine

C9.3 ACERT™ Tier 4i/Stage IIIB Engine

At a Glance

Minimum Rating
300 BHP
Maximum Rating
350 BHP
US EPA Tier 4 Interim, EU Stage IIIB
45.3 in
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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

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Minimum Rating 300BHP
Maximum Rating 350BHP
Governor and Protection Electronic (ADEM™ A4)
RPM 2200r/min
Aspiration Turbocharged-Aftercooled
Displacement 567.5in³
Flywheel and Flywheel Housing SAE 1 or SAE 2
Flywheel Teeth 113 (SAE 1)
Rotation from Flywheel End Counterclockwise
Stroke 5.87in
Bore 4.53in


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Emissions US EPA Tier 4 Interim, EU Stage IIIB


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Length 45.3in
Width 32.6in
Height 44.21in
Weight 1950lb

Capacity for Liquids

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Lube Oil System - Refill 31.7gal (US)
Cooling System 23.5gal (US)