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Maximum Rating1004 BHP (749 bkW)
EmissionsNSPS Site Compliant Capable
Displacement3158 in³ (51.8 l)
Minimum Rating790 BHP (589 bkW)
The line of G3500 engines brings versatility, uptime, and low operating cost to your gas compression operation. They are equipped with ADEM A3 technology that enables highest performance and safety while maintaining low emissions. Ideal applications for G3500 engines include gas lift, gas gathering, and wellhead gas compression. Cat G3508 gas engine. Ratings: 589-749 bkW (790-1004 bhp) @ 1200-1400 rpm are NSPS site compliant capable with customer-provided aftertreatment.


Maximum Rating1004 BHP (749 bkW)
EmissionsNSPS Site Compliant Capable
Displacement3158 in³ (51.8 l)
Minimum Rating790 BHP (589 bkW)
Ignition, ProtectionADEM™ A3
Air/Fuel Ratio ControlADEM™ A3

Benefits and Features

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

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 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.

Side covers on block allow for inspection of internal components

Large variety of factory-installed engine attachments reduces packaging time

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

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.

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 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

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Standard Equipment

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

Optional Equipment

  • Remote air inlet adapters
  • Precleaners
  • Battery chargers
  • Charging alternator
  • Cleanable aftercooler core
  • Connection flanges
  • Expansion and overflow tank
  • Water level switch gauge
  • Flexible fittings
  • Elbows
  • Connection flanges
  • Exhaust expanders
  • Rain cap (NA engine only)
  • Mufflers
  • Low pressure gas conversions
  • Propane gas valve and jet kits
  • Fuel filter
  • Air/fuel ratio control
  • PL1000 communications modules
  • Oil bypass filter removal
  • Oil pan accessories
  • Sump pump
  • Air prelube pump
  • Manual prelube pump
  • Lubricating oil
  • Rails
  • Vibration isolators
  • Front accessory drives
  • Auxiliary drive shafts and pulleys
  • Front stub shaft
  • Pulleys
  • Crankcase explosion relief valves
  • 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
  • Flywheel guard removal
  • Engine barring group
  • Premium 8:1 pistons