G3512 Low Emissions Gas Compression Engine


Meets U.S. EPA Spark Ignited Stationary NSPS Emissions for 2007/8

Advanced Digital Engine Management

ADEM A3 control system providing integrated ignition, speed governing, protection, and controls, including detonation-sensitive variable ignition timing. ADEM A3 has improved: user interface, display system, shutdown controls, and system diagnostics.

Lean Burn Engine Technology

Lean-burn engines operate with large amounts of excess air. The excess air absorbs heat during combustion reducing the combustion temperature and pressure, greatly reducing levels of NOx. Lean-burn design also provides longer component life and excellent fuel consumption.

Ease of Operation

Side covers on block allow for inspection of internal components

Full Range of Attachments

Large variety of factory-installed engine attachments reduces packaging time


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

Gas Engine Rating Pro

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

Product Support Offered Through Global Cat Dealer

More than 2,200 dealer outlets Cat factory-trained dealer technicians service every aspect of your petroleum engine Cat parts and labor warranty Preventive maintenance agreements available for repairbefore
 - failure options S•O•SSM program matches your oil and coolant samples against Caterpillar set standards to determine:
 - Internal engine component condition
 - Presence of unwanted fluids
 - Presence of combustion by-products
 - Site-specific oil change interval

Over 80 Years of Engine Manufacturing Experience

Over 60 years of natural gas engine production Ownership of these manufacturing processes enables Caterpillar to produce high quality, dependable products.
 - Cast engine blocks, heads, cylinder liners, and flywheel housings
 - Machine critical components
 - Assemble complete engine

Web Site

For all your petroleum power requirements, visit www.catoilandgasinfo.com.

Web Site

For all your petroleum power requirements, visit www.catoilandgasinfo.com.

Engine Specifications
Maximum Rating 749 bkW (1004 BHP)
Emissions NSPS Site Compliant Capable
Minimum Rating 589 bkW (790 BHP)
Ignition, Protection ADEM™ A3
Air/Fuel Ratio Control ADEM™ A3
Displacement 51.8 l (3158 inu00b3)

Standard Equipment

  • Air Inlet System
    • Air cleaner — intermediate-duty with service indicator
  • Cooling System
    • High temperature circuit (engine jacket + oil cooler):
    • Low temperature circuit (aftercooler):
  • Exhaust System
    • Watercooled exhaust manifolds
    • Crankcase breather — top mounted
  • Flywheels & Flywheel Housings
    • SAE No. 00 flywheel
    • SAE No. 00 flywheel housing
    • SAE standard rotation
  • Fuel System
    • Gas pressure regulator
    • Natural gas carburetor
  • Instrumentation
    • Advisor panel
  • Lubrication System
    • Oil cooler
    • Oil filter — RH
    • Oil bypass filter (TA or NA engines only)
    • Oil pan — shallow
    • Oil sampling valve
    • Turbo oil accumulator
  • Mounting System
    • Rails, engine mounting — 254 mm (10 in.)
  • Protection System
    • Electronic shutoff system
    • Gas shutoff valve
  • General
    • Paint — Cat yellow
    • Vibration damper and guard — dual 484 mm (23 in.)

Optional Equipment

  • Air Inlet System
    • Remote air inlet adapters
    • Precleaners
  • Charging System
    • Battery chargers
    • Charging alternator
  • Cooling System
    • Cleanable aftercooler core
    • Connection flanges
    • Expansion and overflow tank
    • Water level switch gauge
  • Exhaust System
    • Flexible fittings
    • Elbows
    • Connection flanges
    • Exhaust expanders
    • Rain cap (NA engine only)
    • Mufflers
  • Fuel System
    • Low pressure gas conversions
    • Propane gas valve and jet kits
    • Fuel filter
    • Air/fuel ratio control
  • Instrumentation
    • PL1000 communications modules
  • Lubrication System
    • Oil bypass filter removal
    • Oil pan accessories
    • Sump pump
    • Air prelube pump
    • Manual prelube pump
    • Lubricating oil
  • Mounting System
    • Rails
    • Vibration isolators
  • Power Take-Offs
    • Front accessory drives
    • Auxiliary drive shafts and pulleys
    • Front stub shaft
    • Pulleys
  • Protection System
    • Crankcase explosion relief valves
  • Starting System
    • Air starting motor
    • Air pressure regulator
    • Air silencer
    • Electric air start controls
    • Electric starting motors — dual 24-volt
    • Battery sets (24-volt dry), cables, and rack
  • General
    • Flywheel guard removal
    • Engine barring group
    • Premium 8:1 pistons

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