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G3304 Standard 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 — gear-driven

Exhaust System
  • Watercooled exhaust manifolds
  • Dry exhaust elbow

Flywheel & Flywheel Housing
  • 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 pan — full sump
  • Oil filler and dipstick

Mounting System
  • Engine supports

Protection System
  • Shutoffs

  • Paint — Cat yellow
  • Crankshaft drive pulley
  • Lifting eyes

G3304 Optional Equipment

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

Control System
  • Vernier and positive locking control

Cooling System
  • Expansion tank
  • Heat exchanger/expansion tank
  • Radiator
  • Blower fan
  • Suction fan
  • Belt tightener
  • Fan drive

Exhaust System
  • Flexible fittings
  • Elbows
  • Flange
  • Pipe
  • Rain cap
  • Mufflers

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

  • Gauges and instrument panels

Lube System
  • Lubricating oil

Mounting System
  • Vibration isolators

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

Protection System
  • Mechanical shutoffs
  • Gas valves

Starting System
  • Air starting motor
  • Air pressure regulator
  • Air silencer
  • Electric starting motor
  • Battery sets
  • Battery cables
  • Battery rack

  • Tool set


The Cat® G3304 Industrial Gas Engine is offered in the following rating: 71 bkW (95 bhp) @ 1800 rpm. This rating is 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 95.0 BHP 71.0 bkW Less
Maximum Power 95.0 BHP 71.0 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 7.0 L (425 in³) 7.0 L (425 in³) Less
Aspiration Naturally Aspirated (NA) Naturally Aspirated (NA) Less
Engine Configuration Engine - Continuous Engine - Continuous Less

Engine Dimensions - Approximate

Height 1170 mm (46 in) 1170 mm (46 in) Less
Length 1158 mm (46 in) 1158 mm (46 in) Less
Weight - Net Dry 757 kg (1670 lb) 757 kg (1670 lb) Less
Width 744 mm (29 in) 744 mm (29 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

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