G3520J Gas Compression Engine

G3520J Gas Compression Engine

The line of G3520J 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 ...
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Engine Specifications

U.S. EPA Spark Ignited Stationary NSPS emissions for 2010
Minimum Rating
Oil Change Interval
2000 hrs
Lean Burn
Rotation from Flywheel End

Governor and Protection

Governor and Protection
Electronic (ADEM™ A3)

Capacity for Liquids

Lube Oil System - Refill
143gal (US)

Engine Design

  • Built on G3500 LE proven reliability and durability
  • Ability to burn a wide spectrum of gaseous fuels
  • Robust diesel strength design prolongs life and lowers owning and sdfsoperating costs
  • Broad operating speed range at lower site air density (high altitude/ sdfshot ambient temperatures)
  • Higher power density improves fleet management
  • Quality engine diagnostics
  • Detonation-sensitive timing control for individual cylinderst temperatures)

Ultra Lean Burn Technology (ULB)

ULB technology uses an advanced control system, a better turbo sdfamatch, improved air and fuel mixing, and a more sophisticated sdfscombustion 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 and some non-attainment areas
  • Lean air/fuel mixture provides best available emissions and fuel efficiency for engines of this bore size

Advanced Digital Engine Management

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.

Full Range of Attachments

Large variety of factory-installed engine attachments reduces packaging time


Every engine is full-load tested to ensure proper engine performance

Gas Engine Rating Pro

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.

Product Support Offered Through Global Cat Dealer

  • 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 repair sdfsbefore-failure options
  • S•O•SSM program matches your oil and coolant samples sdfdagainst Caterpillar set standards to determine:-Internal engine component condition-Presence of unwanted fluid-Presence of combustion by-products-Site-specific oil change interval

Web Site

For all your Oil & Gas power requirements, visit www.cat.com/oilandgas

Standard Equipment:

Optional Equipment:

    Air Inlet System
    • Round air inlet adaptors
    • Rain shield
    Charging System
    • CSA alternator (24V,65A)
    Cooling System
    • Jacket water inlet flange-hose connection
    Exhaust System
    • Flexible fittings
    • Flanges
    • Elbow
    Fuel System
    • Fuel filter
    • LAN adapter
    • 15',40',90',140' Product Link extension harness
    • 20',30',50',100' interconnect harness
    Lubrication System
    • Lubricating oil
    • Oil bypass filter
    • Air prelube pump
    • Oil pan drain
    Power Take-offs
    • Front stub shaft
    • Crankshaft pulley
    Starting System
    • Air pressure regulator
    • 90 psi starter
    • 150 psi starter
    • Jacket water heater
    • Special paint
    • Crankshaft vibration double damper
    • Explosion relief valves
    Eu Certification
    • EEC DOI certification