Cat® G3412 Industrial Gas Engine. Ratings: 448-475 bkW (600-637 bhp) @ 1800 rpm are NSPS site compliant capable with customer-supplied aftertreatment. Some ratings also have standard emission settings available for export only. For specific emission information, please consult your local Cat Dealer.

Power Rating
Minimum Power 600 BHP
Maximum Power 637 BHP
Frequency 1800 rpm

Bore 137 mm (5.4 in)
Stroke 152 mm (6.0 in)
Displacement 27 L (1649³)
Aspiration Turbocharged Aftercooled (TA)
Engine Configuration Engine - Continuous

Engine Dimensions - Approximate
Height 1960 mm (77 in)
Length 2442 mm (96 in)
Weight - Net Dry 2141 kg (4720 lb)
Width 1598 mm (63 in)


Ratings are NSPS site compliant capable with customer-supplied aftertreatment. Some ratings also have standard emission settings available for export only. For specific emission information, please refer to the engine spec sheet.

Engine Design

  • Improved reliability and durability
  • Ability to burn a wide spectrum of gaseous fuels
  • Robust diesel strength design prolongs life and lowers owning and operating costs
  • Broad operating speed range

Full Range of Attachments

Large variety of factory-installed engine attachments reduces packaging time


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 CatIndustrial Service Distributor (ISD) program

Standard Equipment

Air Inlet System
  • Air cleaner — single element with service indicator
Control System
  • Governor — Woodward PSG mechanica
  • Governor control — positive locking
Cooling System
  • Thermostats and housing
  • Jacket water pump
  • Aftercooler water pump
  • Aftercooler core
Exhaust System
  • Watercooled exhaust manifolds
  • Dry exhaust elbow
Flywheel & Flywheel Housing
  • SAE No. 0 flywheel
  • SAE No. 0 flywheel housing
  • SAE standard rotation
Fuel System
  • Gas pressure regulator
  • Natural gas carburetor
Ignition System
  • Digital ignition system
  • Service meter
Lube System
  • Crankcase breather — top mounted
  • Oil cooler
  • Oil filter — RH
  • Auxiliary oil reservoir
  • Rear sump oil pan
  • Oil filler in valve cover and dipstick — RH
Mounting System
  • Engine supports
Protection System
  • Shutoff
  • Paint — Cat yellow
  • Crankshaft vibration damper and drive pulleys
  • Lifting eyes

Optional Equipment

Air Inlet System
  • Air cleaner
  • Air inlet adapter
  • Precleaner
  • Air cleaner rain cap
Charging System
  • Battery chargers
  • Charging alternators
  • Ammeter gauge
  • Ammeter gauge and wiring
  • Control mounting
Control System
  • EG3P/2301A speed control governor
  • PSG electric governor
  • PSG pneumatic governor
Cooling System
  • Radiators
  • Blower fan and fan drives for customer suppliedradiators
  • ATAAC conversion
  • Aftercooler
  • Expansion tank
  • Heat exchanger
Exhaust System
  • Flexible fittings
  • Elbows
  • Flanges
  • Rain caps
  • Mufflers
Fuel System
  • Dual gas regulator
  • Low energy fuel carburetor
  • Low pressure gas conversion
  • Propane and natural gas valve and jet kits
  • Fuel filter
Ignition System
  • CSA ignition
  • Ignition ground wiring harness
  • Power supply — digital ignition system
  • Alarm module
  • Gauges and instrument panels
Lube System
  • Auxiliary oil reservoir removal
  • Lubricating oil
Mounting System
  • Vibration isolators
Power Take-Offs
  • Auxiliary drive pulleys
  • Enclosed clutch
  • Clutch support
  • Front stub shaft
  • Flywheel stub shaft
  • Pulley removal
Protection System
  • Gas valves
  • Status control box interconnect wiring harness
Starting System
  • Air starting motor
  • Electric air start control
  • Air pressure regulator
  • Air silencer
  • Electric starting motors — single 24-volt
  • Starting aids
  • Battery sets (24-volt dry), cables, and rack
  • Tool set
  • Digital diagnostic tool

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