Cat® C3.4B Diesel Engine

Cat® C3.4B Diesel Engine

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Cat® C3.4B Industrial Diesel Engines offer the perfect balance of durability, fuel efficiency and low emissions. The C3.4B Industrial Engine is offered in ratings ranging from 63-90 bkW ...

Power Rating

Minimum Power
Maximum Power
Rated Speed
2200 & 2500 rpm

Emission Standards

U.S. EPA Tier 4 Final, EU Stage IV Nonroad Emission Standards. U.S. EPA Tier 4 Interim Equivalent and EU Stage IIIB Equivalent ratings available using EPA or EU Flex Provisions.


Engine Configuration
In-Line 4, 4-Stroke-Cycle Diesel
99 mm (3.9 in)
110 mm (4.3 in)
3.4 L (207.5 in³)
Turbocharged-Aftercooled (TA)
Compression Ratio
Combustion System
Direct Injection
Rotation from Flywheel End
Cooling System - Capacity
6 L (6.3 qt)

Engine Dimensions - Approximate

623 mm (24.5 in)
610 mm (24 in)
805.5 mm (31.7 in)
Dry Weight - Basic Operating Engine Without Optional Attachments
270 kg (595.2 lbs)

Aftertreatment Dimensions - Approximate

SCR Diameter
251 mm (9.88 in)
DOC Weight
15 kg (33 lb)
DOC Length
320 mm (12.6 in)
DOC Diameter
196 mm (7.7 in)
SCR Length
520 mm (20.47 in)
SCR Weight
20 kg (44 lb)

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.

High Performance

Leading-edge technology provides significant improvements in power, torque, fuel consumption and response. Technology includes single smart wastegated turbo systems, durable high pressure common rail technology, and closed circuit breathing system.

Fuel Efficiency

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

Fuel & Oil

Tier 4 Interim or Tier 4 Final, Stage IIIB or Stage IV engines require Ultra Low Sulfur Diesel (ULSD) fuel containing a maximum of 15 ppm sulfur, and new oil formulations to support the new technology. Cat engines are designed to accommodate B20 biofuel. Your Cat dealer can provide more information regarding fuel and oil.

Broad Application Range

Industry leading range of factory configurable ratings and options for agricultural, material handling, construction, mining, aircraft ground support, and other industrial applications.

Standard Equipment: