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The C3.4 Industrial Diesel Engine is offered in the following ratings: 47 & 55 bkW (63 & 73.7 bhp) @ 2500 rpm. These ratings meet U.S. EPA Tier 4 Interim, EU Stage IIIA emission standards.

Power Rating

Minimum Power 63.0 bhp 47.0 bkW Less
Maximum Power 73.7 bhp 55.0 bkW Less
Frequency 2500 rpm 2500 rpm Less

Emission Standards

Emissions U.S. EPA Tier 4 Interim, EU Stage IIIA U.S. EPA Tier 4 Interim, EU Stage IIIA Less


Engine Configuration Inline 4, 4-Stroke-Cycle Diesel Inline 4, 4-Stroke-Cycle Diesel Less
Bore 94 mm (3.7 in) 94 mm (3.7 in) Less
Stroke 120 mm (4.72 in) 120 mm (4.72 in) Less
Displacement 3.3 L (201 in³) 3.3 L (201 in³) Less
Aspiration Naturally Aspirated (NA) or Turbocharged (T) Naturally Aspirated (NA) or Turbocharged (T) Less
Compression Ratio 19.5:1 (NA), 22.0:1 (T) 19.5:1 (NA), 22.0:1 (T) Less
Combustion System Indirect Injection (NA), Direct Injection (T) Indirect Injection (NA), Direct Injection (T) Less
Rotation (from flywheel end) Counterclockwise Counterclockwise Less
Cooling System Capacity 5-5.5 L (5.3-5.8 qt) 5-5.5 L (5.3-5.8 qt) Less
Lube System (refill) 9 L (9.5 qt) 9 L (9.5 qt) Less

Engine Dimensions (Approximate. Final dimensions dependent on selected options)

Length 781-784 mm (30.7-30.9 in) 781-784 mm (30.7-30.9 in) Less
Width 590-649 mm (23.2-25.5 in) 590-649 mm (23.2-25.5 in) Less
Height 722-821.3 mm (28.4-32.3 in) 722-821.3 mm (28.4-32.3 in) Less
Weight - Net Dry (Basic Operating Engine Without Optional Attachments) 245-265 kg (540-584 lb) 245-265 kg (540-584 lb) Less


Meets U.S. EPA Tier 4 Interim, EU Stage IIIA emission standards.

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

With maximum torque levels maintained, this engine provides class-leading power take-off capability.

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.

Low Cost Maintenance

Single-side servicing improves ease of maintenance and simplifies the servicing routine. Standard 500 hour service intervals.


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

World-class Product Support Offered Through Global Cat Dealer Network

  • Scheduled maintenance, including S•O•SSM 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

C3.4 Standard Equipment

Air Inlet System
  • Inlet manifold with choice of inlets.

Control System
  • Alternator 12 volt
  • Starter motor 12 volt
  • Glow plug starting aid

Cooling System
  • Belt-driven coolant pump
  • Choice of cooling fans

Flywheels and Flywheel Housing
  • SAE No. 8 or SAE No. 10 flywheel
  • SAE No. 4 flywheel housing

Fuel System
  • Electronic Shut-off Solenoid (ESOS)

Lube System
  • Lube oil pressure switch
  • Two oil fill positions, front and top cover

  • Cast iron, engine block
  • Cast iron exhaust manifold--side outlet
  • Cold start capability to -20° C (-4° F)
  • Closed circuit breather
  • Paint: Cat yellow, with optional colors available at request

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