C9.3B China NR4

Cat® C9.3B Diesel Engine

C9.3B China NR4 Diesel Engines - Highly Regulated


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, EU Stage V, Japan 2014, and Korea Tier 4
Final* or China Nonroad Stage IV 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.


With a full list of configurable options and an engine-mounted aftertreatment, the Cat C9.3B is an easy-to-install option that offers the power of larger engine platforms in a smaller engine package.

Advanced Features

Inlet throttle valve technology manages heat and in-cylinder dosing to create seamless DPF regeneration and a high-pressure common rail fuel system elimates the need for coolers, creating a simpler and lighter engine that's 18% more powerful than its predecessor engine—so operators get work done no matter when, no matter what.

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

Between 500-hour oil service and 5000-hour DPF ash intervals and Caterpillar-patented design technology that enables the removal of EGRs, the need for parts and service keeps lifetime engine ownership costs down and ROI up. And because the Cat C9.3B uses the latest injector technology, owners can benefit from an overall fuel consumption reduction of up to 8% when compared to its predecessor engine.

Cat Dealer Product Support

Expert assistance is never far away with the Cat C9.3B. With an included warranty and product support through the expansive global Cat dealer network, worldwide service and maintenance is all part of the package. See your Cat dealer for details.


The Cat C9.3B is a finely tuned machine, running quieter and more efficiently than previous engines making it safer for job site operators who can stay focused on the task at hand.

  • Standard Equipment
  • Specs
  • Docs

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.
  • General
    • Paint: Caterpillar yellow, with optional colors available at request
    • Vibration damper
    • Lifting eyes
  • Aftertreatment
    • Clean Emissions Module (CEM) consisting of Diesel Particulate Filter (DPF), Diesel Oxidation Catalyst (DOC) and high-efficiency Selective Catalytic Reduction (SCR)
  • Tier 4 Final, Proposed Stage V Aftertreatment
    • Pump Electronic Control Unit (PETU)
    • Available in 12V or 24V systems



Long Name:
Cat® C9.3B Diesel Engine
C9.3B China NR4

Power Rating

Maximum Power
456 HP / 340 kW
Maximum Torque
1540 lb-ft @ 1400 rpm / 2088 Nm @ 1400 rpm
Rated Speed
1800-2200 rpm
Minimum Power
335 HP / 250 kW

Emission Standards

China Nonroad Stage IV


Engine Configuration
In-Line 6
4.5 in / 115 mm
5.9 in / 149 mm
567.5 in³ / 9.3 l
Compression Ratio
Turbocharged-Aftercooled (TA)
Combustion System
Direct Injection
Rotation from Flywheel End

Engine Dimensions - Approximate

44.3 in / 1125 mm
31.1 in / 791 mm
42 in / 1068 mm
Weight - Net Dry - Basic Operating Engine Without Optional Attachments
1907 lb / 865 kg

Aftertreatment Dimensions

36.4 in / 925 mm
27.3 in / 694 mm
17 in / 432 mm
211 lb / 96 kg