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G3306Standard Equipment

Air Inlet System
  • Air cleaner
  • Air cleaner rain cap
  • Service indicator

Control System
  • Hydra-mechanical governor

Cooling System
  • Thermostats and housing
  • Jacket water pump
  • Aftercooler water pump
  • Aftercooler core

Exhaust System
  • Watercooled exhaust manifolds
  • Dry exhaust elbow

Flywheels & Flywheel Housings
  • SAE No. 1 flywheel
  • SAE No. 1 flywheel housing
  • SAE standard rotation

Fuel System
  • Gas pressure regulator
  • Natural gas carburetor

Ignition System
  • Altronic V ignition system

  • Service meter

Lube System
  • Crankcase breather — top mounted
  • Oil cooler
  • Oil filter
  • Oil pan — full sump
  • Oil filler and dipstick

Mounting System
  • Engine supports

Protection System
  • Shutoffs

  • Paint — Cat yellow
  • Crankshaft vibration damper and pulley
  • Lifting eyes

G3306Optional Equipment

Charging System
  • Battery chargers
  • Charging alternators
  • Ammeter gauge
  • Ammeter gauge and wiring

Control System
  • PSG Woodward governor
  • Vernier and positive locking control

Cooling System
  • ATAAC conversion
  • Aftercooler group
  • Expansion tank
  • Heat exchanger and expansion tank
  • Radiator
  • Blower fan for customer supplied radiators
  • Suction fan for customer supplied radiators
  • Fan drives for customer supplied radiators
  • Fan adapter for customer supplied radiators
  • Belt tightener

Exhaust System
  • Flexible fittings
  • Elbows
  • Flanges
  • Pipes
  • Rain caps
  • Mufflers

Fuel System
  • Low pressure gas conversion
  • Fuel filter

Ignition System
  • Altronic III
  • CSA shielded ignition
  • Wiring harness
  • Dual timing

  • Gauges and instrument panels

Lube System
  • Lubricating oil

Mounting System
  • Vibration isolators

Power Take-Offs
  • Auxiliary drive pulleys and auxiliary pump
  • Enclosed clutch and clutch support
  • Flywheel stub shaft
  • Front stub shaft

Protection System
  • Mechanical shutoff
  • Gas valves

Starting System
  • Air starting motor
  • Air pressure regulator
  • Air silencer
  • Electric starting motors with start switch installed/ shipped loose
  • Starting aids
  • Battery sets

  • Tool set


The Cat® G3306 Industrial Gas Engine is offered in ratings ranging from 108-157 bkW (145-211 bhp) @ 1800 rpm. These ratings are NSPS site compliant capable with customer-supplied aftertreatment. Some ratings also have standard emission settings available for export only. For specific emission information, please consult your local Cat Dealer.

Power Rating

Minimum Power 145.0 BHP 108.0 bkW Less
Maximum Power 211.0 BHP 157.0 bkW Less
Frequency 1800 rpm 1800 rpm Less


Bore 121 mm (4.75 in) 121 mm (4.75 in) Less
Stroke 152 mm (6.0 in) 152 mm (6.0 in) Less
Displacement 10.5 L (638 in³) 10.5 L (638 in³) Less
Aspiration Turbocharged Aftercooled (TA) Turbocharged Aftercooled (TA) Less
Engine Configuration Engine - Continuous Engine - Continuous Less

Engine Dimensions - Approximate

Height 1261 mm (50 in) 1261 mm (50 in) Less
Length 1539 mm (60 in) 1539 mm (60 in) Less
Weight - Net Dry 948 kg (2090 lb) 948 kg (2090 lb) Less
Width 978 mm (38 in) 978 mm (38 in) Less


Ratings are NSPS site compliant capable with customer-supplied aftertreatment. Some ratings also have standard emission settings available for export only. For specific emission information, please refer to the engine spec sheet.

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

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 SOSSM sample
  • Customer Support Agreements (CSA)
  • Caterpillar Extended Service Coverage (ESC)
  • Superior dealer service network
  • Extended dealer service network through the Cat Industrial Service Distributor (ISD) program