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Maximum Rating1380 BHP (1029 bkW)
EmissionsNSPS Site Compliant Capable
Displacement4230 in³ (69.3 l)
Minimum Rating1380 BHP (1029 bkW)
The line of G3500B engines brings versatility, uptime, and low operating cost to your gas compression operation. They deliver the lowest engine-out emissions in the industry without sacrificing performance. Ideal applications for G3500B engines include gas lift, gas gathering, and wellhead gas compression. Cat G3508B gas engine. Ratings: 1029 bkW (1380 bhp) @ 1400 rpm are NSPS site compliant capable.


Maximum Rating1380 BHP (1029 bkW)
EmissionsNSPS Site Compliant Capable
Displacement4230 in³ (69.3 l)
Minimum Rating1380 BHP (1029 bkW)
AspirationTurbocharged-2 Stage Aftercooled
Flywheel and Flywheel HousingSAE No. 00
Flywheel Teeth183
Weight - Dry18520 lb (8401 kg)
Cooling System58.5 gal (US) (221.5 l)
Lube Oil System - Refill112 gal (US) (424 l)
Oil Change Interval1000 hr
Ignition, ProtectionADEM™ A3
Stroke7.5 in (190 mm)
Bore6.7 in (170 mm)

Benefits and Features

ULB technology uses an advanced control system, a better turbo match, improved air and fuel mixing, and a more sophisticated combustion recipe to provide: - Lowest engine-out emissions - Highest fuel efficiency - Improved altitude and speed turndown - Stable load acceptance and load rejection

- Meets U.S. EPA Spark Ignited Stationary NSPS emissions for 2010 - Lean air/fuel mixture provides best available emissions and fuel efficiency for engines of this bore size

ADEM A3 engine management system integrates speed control, air/fuel ratio control, and ignition/detonation controls into a complete engine management system. ADEM A3 has improved: user interface, display system, shutdown controls, and system diagnostics.

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

For all your petroleum power requirements, visit

For all your petroleum power requirements, visit

Standard Equipment

  • Axial flow air cleaners
  • Service indicator
  • Cleanable
  • Two-stage charge air cooling:
  • Engine cooling and charge air cooling thermostats
  • Dry exhaust manifolds and turbocharger housings
  • SAE 00 flywheel
  • SAE 00 flywheel housing
  • SAE standard rotation
  • Electronic fuel metering valve
  • Requires 7-50 psig gas supply
  • Gas pressure regulator
  • Gas shutoff valve
  • Remote-mounted Advisor control panel
  • Interconnect harness
  • Top-mounted crankcase breathers
  • Oil cooler
  • Oil filter and oil sampling valve
  • Drain valve
  • Turbo oil accumulator
  • API B16.3 approved gas/air-driven pre-lube system
  • Caterpillar provided
  • 4" LCD Advisor display panel
  • Shipped loose
  • 90 psi TDI starter
  • 150 psi TDI starter
  • Front housing, two sided
  • Front lower LH accessory drive
  • Low oil pressure
  • Oil filter differential pressure
  • High fuel or oil temperature
  • Engine oil to engine coolant
  • Differential temperature
  • High coolant temperature
  • Engine speed
  • Engine load
  • Battery voltage
  • Detonation
  • Manifold air temperature
  • Coolant JW inlet/outlet pressure
  • Left turbo inlet temperature
  • Right turbo inlet temperature
  • Cylinder port temperature
  • Service hours
  • Oxygen level
  • Paint — Cat yellow
  • Dual 23" vibration damper with guard
  • CSA Certification, Class 1 Division 2 Groups C and D

Optional Equipment

  • Rectangular air inlet adapter
  • Circular air inlet adapter
  • Battery Charger 20 amp
  • Mechanical joint assembly
  • Inlet connection
  • Flexible fittings available at first production build
  • Elbows and mufflers
  • Optional interconnect harness
  • Shipped with lube oil
  • Front stub shaft
  • Options available