G3520J Gas Compression Engine

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EmissionsU.S. EPA Spark Ignited Stationary NSPS emissions for 2010
Minimum Rating1725 BHP (1286 bkW)
Bore6.7 in (170 mm)
Rotation from Flywheel EndCounterclockwise
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 applications for G3520J engines include primary gathering, central gathering, and gas processing plants.


EmissionsU.S. EPA Spark Ignited Stationary NSPS emissions for 2010
Minimum Rating1725 BHP (1286 bkW)
Bore6.7 in (170 mm)
Rotation from Flywheel EndCounterclockwise
Stroke7.5 in (190 mm)
CombustionLean Burn
Lube Oil System - Refill143 gal (US) (541 l)
Governor and ProtectionElectronic (ADEM™ A3)
Oil Change Interval2000 hrs

Benefits and Features

  • 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)

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

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 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

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

Standard Equipment

  • Axial Flow Air cleaner
  • Single element canister type with service indicator
  • Two-stage charge air cooling: First stage - JW + OC + 1st stage AC / Second stage - 2nd stage AC
  • Jacket water and aftercooler thermostats
  • Water-cooled exhaust manifolds
  • Dry turbocharger housings
  • Water-cooled exhaust elbow
  • SAE No. 21 flywheel
  • SAE No. 00 flywheel housing
  • SAE standard rotation
  • 7-40 psig gas supply
  • Electronic fuel metering valve
  • Gas pressure regulator
  • Gas shutoff valve
  • Remote-mounted Advisor control panel
  • Product Link cellular radio
  • Crankcase breather — top mounted
  • Oil cooler
  • Oil filter — RH
  • Oil pan — 143 gal
  • Oil sampling valve
  • Turbo oil accumulator
  • Front housing — two-sided
  • Front lower LH accessory drive
  • Paint — Cat yellow
  • Crankshaft vibration damper and guard

Optional Equipment

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