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Maximum Rating211 BHP (157 bkW)
EmissionsNSPS 2010
Displacement638 in³ (10.5 l)
Minimum Rating145 BHP (108 bkW)
Tough and durable, built on the industry-standard G3300 platform and equipped with technology that brings performance, uptime, and low operating cost to your operation. G3306B engines meet the most demanding continuous duty gas compression applications with virtually no unscheduled downtime. Ideal applications for G3306B engines include gas lift, gas gathering, and wellhead gas compression. Cat G3306B gas engine. Ratings: 108-157 bkW (145-211 bhp) @ 1800 rpm are NSPS site compliant capable with Caterpillar or customer-provided air-fuel ratio control and aftertreatment.


Maximum Rating211 BHP (157 bkW)
EmissionsNSPS 2010
Displacement638 in³ (10.5 l)
Minimum Rating145 BHP (108 bkW)
Compression Ratio10.5:1
AspirationNaturally Aspirated or Turbocharged-Aftercooled
Rotation from Flywheel EndCounterclockwise
Flywheel and Flywheel HousingSAE No. 1
Flywheel Teeth156
Weight - Dry2450 lb (1111 kg)
Cooling System5.25 gal (US) (20 l)
Lube Oil System - Refill11.9 gal (US) (44.5 l)
Oil Change Interval750 hours
Ignition, ProtectionADEM A4
Air/Fuel Ratio ControlADEM A4
Stroke6 in (152 mm)
Bore4.8 in (121 mm)

Benefits and Features

The ADEM A4 system represents the next generation of engine management systems while reducing the number of mechanical components and easing troubleshooting. Features include: • Air/Fuel Ratio Control (AFRC) • Electronic ignition • Electronic governing/speed control • Start/stop logic • Engine protection & monitoring

Large variety of factory-installed engine attachments reduces packaging time

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 Caterpillar parts and labor warranty Preventive maintenance agreements available for repairbefore-failure options S•O•SSM program matches your oil and coolant samples against Catepillar 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

  • Air cleaner — intermediate duty, dry
  • Air cleaner rain cap (shipped loose)
  • Service indicator
  • Thermostats and housing — full open temperature 97°C (207°F)
  • Jacket water pump — gear-driven, centrifugal, non-self-priming
  • Exhaust manifolds — watercooled
  • Exhaust elbow — dry
  • 102 mm (4 in)
  • Three-way catalyst — 1.0 g NOx and 0.5 g NOx catalyst options
  • Flywheel, SAE No. 1
  • Flywheel housing, SAE No. 1
  • SAE standard rotation
  • Air/fuel ratio control
  • Gas pressure regulator
  • Requires 10.3-34.5 kPa (1.5-5 psi) gas
  • Natural gas carburetor
  • ADEM A4 ignition
  • Crankcase breather, top mounted
  • Oil cooler
  • Oil filter
  • Oil pan, full sump
  • Oil filler and dipstick
  • The following parameters include alarm and shutdown

Optional Equipment

  • 24V, 35A alternator
  • 24V, 35A CSA alternator*
  • Radiators
  • Jacket water pump inlet adapter
  • Exhaust flex fitting — ANSI flange
  • Exhaust elbow
  • Exhaust flange — ANSI flange
  • Fan guard
  • Damper guard
  • CSA certified electronics and ignition
  • Operator interface panel
  • Operator interface panel enclosure
  • 15', 20' and 50' interconnect harness
  • Air pressure regulator
  • Air start silencer
  • Vane starter
  • Electric starter
  • Turbine starter