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The Cat® C9.3B Industrial Diesel Engine is offered in ratings ranging from 250-340 bkW (335-456 bhp) @ 1800-2200 rpm. These ratings meet U.S. EPA Tier 4 Final and EU Stage V emission standards. The C9.3B engines are ideal choices to power applications in agriculture, aircraft ground support, construction, forestry, general industrial, material handling, and mining.

Power Rating

Maximum Power 456.0 HP 340.0 kW Less
Maximum Torque 1540.0 lb-ft @ 1400 rpm 2088.0 Nm @ 1400 rpm Less
Rated Speed 1800-2200 rpm 1800-2200 rpm Less
Minimum Power 335.0 HP 250.0 kW Less

Emission Standards

Emissions U.S. EPA Tier 4 Final and EU Stage V Nonroad Emission Standards. U.S. EPA Tier 4 Final and EU Stage V Nonroad Emission Standards. Less


Engine Configuration In-Line 6 In-Line 6 Less
Bore 4.5 in 115.0 mm Less
Stroke 5.9 in 149.0 mm Less
Displacement 567.5 in³ 9.3 l Less
Aspiration Turbocharged-Aftercooled (TA) Turbocharged-Aftercooled (TA) Less
Compression Ratio 17.0:1 17.0:1 Less
Combustion System Direct Injection Direct Injection Less
Rotation from Flywheel End Counterclockwise Counterclockwise Less

Engine Dimensions - Approximate

Length 1125 mm (44.3 in) 1125 mm (44.3 in) Less
Width 791 mm (31.1 in) 791 mm (31.1 in) Less
Weight - Net Dry - Basic Operating Engine Without Optional Attachments 865 kg (1907 lb) 865 kg (1907 lb) Less
Height 1068 mm (42 in) 1068 mm (42 in) Less
Width 31.1 in 791.0 mm Less
Height 42.0 in 1068.0 mm Less
Length - Approximate 44.3 in 1125.0 mm Less
Weight - Net Dry - Basic Operating Engine Without Optional Attachments 1907.0 lb 865.0 kg Less

Aftertreatment Dimensions - Approximate

Length 925 mm (36.4 in) 925 mm (36.4 in) Less
Width 694 mm (27.3 in) 694 mm (27.3 in) Less
Height 432 mm (17.0 in) 432 mm (17.0 in) Less
Weight 96 kg (211 lb) 96 kg (211 lb) Less

Fuel Efficiency

Fluid consumption optimized to match operating cycles of a wide range of equipment and applications while maintaining low operating costs.


Exceptional power density enables you to use a smaller displacement engine than previously, and optimize the installation in your application. Fully configurable engine and compact aftertreatment minimize package size. Ideal for equipment with narrow engine compartments. Aftertreatment installation flexibility to meet all applications - including engine and remote mount options. Industrial Power Unit (IPU) available from factory to avoid significant design, validation and manufacturing costs.

Low Cost Maintenance

  • Worldwide service delivers ease of maintenance and simplifies the servicing routine. If applicable, minimum 5000-hour diesel particulate filter (DPF) ash service interval enables low-cost maintenance.
  • Capable of optimal oil change intervals of up to 500-hours, depending on rating, application, operating conditions, and maintenance practices.
  • Engine B10 life up to 10000 hours for Tier 4 Final, Stage V. The S·O·S℠ program is available from your Cat dealer to determine oil change intervals and provide optimal performance.


Every Cat engine is manufactured to stringent standards in order to assure customer satisfaction.

Reliable, Quiet and Durable Power

World-class manufacturing capability and processes coupled with proven core engine designs assure reliability, quiet operation, and many hours of productive life.

World-class Product Support Offered Through Global Cat Dealer Network

  • Scheduled maintenance, including SOS℠ sample
  • Customer Support Agreements (CSA)
  • Caterpillar Extended Service Coverage (ESC)
  • Superior dealer service network
  • Extended dealer service network through the Cat Industrial Service Distributor (ISD) program

Tier 4 Final, Stage V Aftertreatment Features

Regeneration. Maximum uptime with transparent aftertreatment regeneration, eliminating the need for operator interaction.

Service. Service: Minimum 5000 hour service interval for DPF / PETU filters.
PETU DEF capacity up to 93.7 liters (24.7 U.S. gallons)

Enhanced Electronics

  • The C9.3B is equipped for the future with the latest technology from a single on engine ECM.
  • 2 wire Ethernet connection allows for simpler, faster installation and allows for remote service and software flash.
  • 12 V and 24 V available.

C9.3B Standard Equipment

Air Inlet System
  • Turbocharged
  • Air-to-Air Aftercooled
  • Mid-mount turbocharged system with front and rear exhaust configurations

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 or RH thermostat outlet
  • Centrifugal water pump
  • Guidance on cooling system design available through your dealer to ensure equipment reliability

Flywheels and Flywheel Housing
  • Available SAE 1 power take-off with optional SAE A, SAE B, SAE C power take-off drives. Engine power can also be taken from the front of the engine with optional attachments. (Tier 4 Final, Proposed Stage V)

Fuel System
  • Electronic high pressure common rail
  • Primary fuel filter
  • Secondary and tertiary fuel filters
  • Fuel transfer pump
  • Electronic fuel priming

Lube System
  • Open crankcase ventilation system
  • Oil cooler
  • Oil filler
  • Lube oil filter
  • Oil dipstick
  • Gear driven oil pump
  • Choice of front, rear or center sumps
  • Open crankcase ventilation system with fumes disposal (optional OCV filter system)

Power Take Off (PTO)
  • SAE A, SAE B or SAE C power take off (PTO) drives. Engine power can also be taken from the front of the engine on some applications.

  • Paint: Caterpillar yellow, with optional colors available at request
  • Vibration damper
  • Lifting eyes

Tier 4 Final, Proposed Stage V Aftertreatment
  • Clean Emissions Module (CEM) consisting of Diesel Particulate Filter (DPF), Diesel Oxidation Catalyst (DOC) and high-efficiency Selective Catalytic Reduction (SCR)
  • Pump Electronic Control Unit (PETU)
  • Available in 12V or 24V systems