Request Info

Contact Us For Price


Maximum Rating637 BHP (475 bkW)
EmissionsNSPS Site Compliant Capable
Displacement1649 in³ (27 l)
Minimum Rating637 BHP (475 bkW)
Tough and durable, built on the industry-standard G3400 platform bring maximum uptime and low operating cost to your operation. G3412C Low Emissions (LE) engines meet the most demanding continuous duty gas compression applications with virtually no unscheduled downtime.Ideal applications for G3412C (LE) engines include gas lift, gas gathering, and wellhead gas compression. Cat G3412C (LE) gas engine. Ratings: 475 bkW (637 bhp) @ 1800 rpm are NSPS site compliant capable with customer-provided aftertreatment.


Maximum Rating637 BHP (475 bkW)
EmissionsNSPS Site Compliant Capable
Displacement1649 in³ (27 l)
Minimum Rating637 BHP (475 bkW)
Compression Ratio8.5:1
Rotation from Flywheel EndCounterclockwise
Flywheel and Flywheel HousingSAE No. 0
Flywheel Teeth136
Weight - Dry4720 lb (2141 kg)
Cooling System14.5 gal (US) (54.9 l)
Lube Oil System - Refill45 gal (US) (170.3 l)
Oil Change Interval750 hours
Ignition, ProtectionCat EIS
Stroke6 in (152 mm)
Bore5.4 in (137 mm)

Benefits and Features

- Proven reliability and durability- Ability to burn a wide spectrum of gaseous fuels- Robust diesel strength design prolongs life and lowersowning and operating costs- Broad operating speed range

- Meets U.S. EPA Spark Ignited Stationary NSPSEmissions for 2007/8- 2.0 g/bhp-hr NOx emission versions available- Larger turbocharger and aftercooler provide leanair/fuel mixture, low emissions, and excellent fuelconsumption

Lean-burn engines operate with large amounts of excessair. The excess air absorbs heat during combustionreducing the combustion temperature and pressure,greatly reducing levels of NOx. Lean-burn design alsoprovides longer component life and excellent fuelconsumption.

Detonation sensitive timing protects the engine againstdetonation damage. Higher voltage and longer sparkduration mean easier starts, fewer misfires, andsmoother operation. Diagnostic codes help pinpointcylinder and component of interest. Spark plugmaintenance codes identify spark plug condition

-    Deep sump oil pan has a larger capacity for normal750-hour oil change intervals- High-strength pan and rails for excellent mounting andstability- Side covers on block allow for inspection of internalcomponents

Large variety of factory-installed engine attachmentsreduces packaging time

Every engine is full-load tested to ensure proper engineperformance.

GERP is a web-based program designed to provide siteperformance capabilities for Cat®natural gas enginesfor the gas compression industry. GERP providesengine data for your site's altitude, ambient temperature,fuel, engine coolant heat rejection, performance data,installation drawings, spec sheets, and pump curves.

More than 2,200 dealer outletsCat factory-trained dealer technicians service everyaspect of your petroleum engineCat parts and labor warrantyPreventive maintenance agreements available for repairbefore-failure optionsS•O•SSM program matches your oil and coolant samplesagainst Caterpillar set standards to determine:- Internal engine component condition- Presence of unwanted fluids- Presence of combustion by-products- Site-specific oil change interval

Over 60 years of natural gas engine productionOwnership of these manufacturing processes enablesCaterpillar to produce high quality, dependable products.- Cast engine blocks, heads, cylinder liners, and flywheelhousings- Machine critical components- Assemble complete engine

For all your petroleum power requirements, visit

Standard Equipment

  • Air cleaner — single element with service indicator
  • Electronic governor
  • Air/fuel ratio control on 1.0 g/bhp-hr NOx engines
  • Thermostats and housing
  • Jacket water pump
  • Aftercooler water pump
  • Aftercooler core
  • Watercooled exhaust manifolds
  • Dry exhaust elbow
  • SAE No. 0 flywheel
  • SAE No. 1 flywheel housing
  • SAE standard rotation
  • Gas pressure regulator (1.5 to 5 psi gas supply required)
  • Natural gas carburetor
  • Cat Electronic Ignition System (EIS) with detonationsensitive timing
  • Service meter
  • Crankcase breather — top mounted
  • Oil cooler
  • Oil filter — RH
  • Oil pan — deep sump
  • Oil filler — RH in valve cover and RH dipstick
  • Engine supports
  • Detonation sensitive timing control
  • Shutoff
  • Paint — Cat yellow
  • Crankshaft vibration damper and pulleys
  • Lifting eyes

Optional Equipment

  • Air cleaner — two-stage
  • Air inlet adapter
  • Precleaner
  • Air cleaner rain cap
  • Battery chargers
  • Charging alternators
  • Ammeter gauge
  • Ammeter gauge and wiring
  • Control mounting
  • Radiators
  • Blower fan and fan drives for customer suppliedradiators
  • Expansion tank
  • Heat exchangers
  • Flexible fittings
  • Elbows
  • Flanges
  • Rain caps
  • Mufflers
  • Dual gas regulator
  • Carburetor kits
  • Fuel filter
  • CSA ignition
  • Ignition ground wiring harness
  • Power supply
  • Alarm module
  • Gauges and instrument panels
  • Vibration isolators
  • Auxiliary drive pulleys
  • Enclosed clutch and clutch support
  • Front stub shaft
  • Flywheel stub shaft
  • Pulley removal
  • Gas valves
  • Status control box interconnect wiring harness
  • Air starting motor — electric air start control
  • Air pressure regulator
  • Air silencer
  • Electric starting motors — single 24-volt
  • Starting aids
  • Battery sets
  • Special paint