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G3508/G3508B Standard Equipment

Flywheels & Flywheel Housings
  • SAE No. 00 flywheel
  • SAE No. 00 flywheel housing
  • SAE standard rotation

Power Take-Offs
  • Auxiliary drive shaft
  • Auxiliary drive pulleys
  • Front housing — two-sided
  • Front stub shaft
  • Front lower LH accessory drive
  • Pulleys

Protection System
  • Gas valve
  • Electronic shutoff system
  • Gas shutoff valve
  • Explosion relief valves

  • Paint — Cat yellow
  • Vibration damper and guard
  • Flywheel guard removal
  • Engine barring group
  • Premium 8:1 pistons

G3508/G3508B Optional Equipment

Air Inlet System
  • Remote air inlet adapters
  • Remote air inlet adapters

Charging System
  • Battery chargers
  • Battery chargers

Cooling System
  • Jacket water thermostats and housing — full opentemperature 98°C (208°F)
  • Aftercooler core
  • Jacket water pump — gear driven, centrifugal,non-self-priming
  • Thermostatic valves
  • Connections
  • Aftercooler water pump — gear driven, centrifugal,non-self-priming
  • Expansion and overflow tank
  • Aftercooler core for sea-air atmosphere
  • Water level switch gauge
  • Aftercooler thermostats and housing — full opentemperature 35°C (95°F)
  • Aftercooler — raw water, cleanable

European Certifications
  • European Union certifications

Exhaust System
  • Exhaust manifolds — watercooled
  • Flexible fittings
  • Elbows
  • Flanges
  • Flange and exhaust expanders
  • Mufflers

Fuel System
  • Gas pressure regulator
  • Fuel filter
  • Natural gas carburetor
  • Fuel gas shut-off valve (24V DC)

  • Customer communication modules
  • Advisor panel
  • Advisor interconnect harness

Lubrication System
  • Oil filters — duplex
  • Oil pan drain
  • Crankcase breathers — top mounted
  • Oil level regulator
  • Sump pumps
  • Oil cooler
  • Lubricating oil
  • Oil filter — RH
  • Oil pan — shallow
  • Oil sampling valve
  • Turbo oil accumulator

Mounting System
  • Rails
  • Vibration isolators
  • Rails, engine mounting

Starting System
  • Air pressure regulator
  • Air silencer
  • JW heaters
  • Battery sets (24-volt dry)
  • Battery accessories


The Cat® G3508 Industrial Gas Engine is offered in ratings ranging from 391 bkW (524 bhp) @ 1200 rpm and 500-514 bkW (670-690 bhp) @ 1400 rpm. These ratings are NSPS site compliant capable with customer-supplied aftertreatment. For specific emission information, please consult your local Cat Dealer.

Power Rating

Minimum Power 524.0 BHP 391.0 bkW Less
Maximum Power 690.0 BHP 514.0 bkW Less
Frequency 1200-1400 rpm 1200-1400 rpm Less


Bore 170 mm (6.7 in) 170 mm (6.7 in) Less
Stroke 190 mm (7.5 in) 190 mm (7.5 in) Less
Displacement 34.5 L (2105 in³) 34.5 L (2105 in³) Less
Aspiration Turbocharged Aftercooled (TA) Turbocharged Aftercooled (TA) Less
Engine Configuration Engine - Continuous Engine - Continuous Less

Engine Dimensions - Approximate

Weight - Net Dry 3941 kg (8688 lb) 3941 kg (8688 lb) Less
Length 2522 mm (99 in) 2522 mm (99 in) Less
Height 2131 mm (84 in) 2131 mm (84 in) Less
Width 2014 mm (79 in) 2014 mm (79 in) Less


Ratings are NSPS site compliant capable with customer-supplied aftertreatment. For specific emission information, please consult your local Cat Dealer.

Engine Design

  • Proven 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

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 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