Cat® C3.4B Diesel Engine

C3.4B Tier 4 Diesel Engines - Highly Regulated

Cat® C3.4B Diesel Engine

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 (84.5-120.7 bhp) @ 2200-2500 rpm, which meet U.S. EPA Tier 4 Final, EU Stage IV emission standards. Industries and applications powered by C3.4B engines include: Agriculture, Aerial Lifts, Aircraft Ground Support, Bore/Drill Rigs, Chippers/Grinders, Compactors/Rollers, Compressors, Construction, Forestry, General Industrial, Irrigation Equipment, Material Handling, Mining, Mobile Earthmoving Equipment, Mobile Light Towers, Mobile Sweepers, Paving Equipment, Pumps, Specialty Ag Equipment, Trenchers, Turf and Landscaping and Underground Mining Equipment.

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Product Specs

Engine Dimensions - Approximate

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

Aftertreatment Dimensions - Approximate

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


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

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.


  • Air Inlet System
    • Induction manifolds
    • Exhaust manifolds
  • Control System
    • Starter motor
    • Alternator
    • Electronic Control Unit
    • Sensors for: engine speed, oil pressure, and coolant temperature
  • Cooling System
    • Cooling packs
  • Flywheels And Flywheel Housing
    • Flywheel housings
    • Flywheel and starter rings
  • Fuel System
    • Fuel filter positions
    • Common rail fuel pump and injectors
  • Lube System
    • Lubricating oil filters
  • General
    • Cold start capability to -20° C (-4° F)
    • Paint: Caterpillar yellow, with optional colors available at request
  • U.s. Epa Tier 4 Final, Eu Stage Iv Aftertreatment/ Clean Emissions Control Equipment
    • Diesel Oxidation Catalyst (DOC)
    • Selective Catalytic Reduction (SCR)
    • SCR Auxiliaries

Optional Equipment

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