Caterpillar’s G3500 series engines are engineered for enduring performance and adaptability. With our suite of upgrade kits, we can help you meet evolving emissions regulations, boost horsepower, and modernize your engine’s control systems—without the need for a full replacement. These upgrades are designed to extend the life of your investment, help reduce the total cost of ownership, and keep your operations running at peak performance.
Upgrade your Cat® G3500 LE series engine with the Gen 2 kit—a smart, field-proven solution designed to help you meet methane emissions goals without compromising performance or uptime.
This simple upgrade delivers up to 35% methane reduction while keeping your site operational and your investment working for you. Built on trusted Cat technology, the G3500 LE Gen 2 kit offers a seamless integration that extends the life of your existing fleet and supports long-term sustainability objectives.
Cost-Effective at Overhaul: When paired with a planned engine overhaul, the kit is a cost-effective upgrade that can impact your methane emissions reduction goals.
No Operational Disruption: No changes to performance, maintenance intervals, compressor package, or site layout.
Simple, Proven Technology: Built on trusted Cat components, the Gen 2 kit integrates seamlessly into any lean burn G3500 LE engine—no software changes, no performance impact, just reliable emissions reduction.
Maximize TCO: Keep your existing assets in the field and relevant, even as regulatory requirements evolve.
**At 1.5-2.0g NOx setting with fuels containing methane. Reduction measured as exhaust-out emissions. See your Gas Engine Rating Pro (GERP) for site-specific data sheet for further details.
Applicable Engine Serial Number prefixes: 2JF*, 9TG, WPM, WPN, N8B, 4KC*, 7NJ, WPR, N2P, WPP, N2N, 3RC*, 4EK, WPW, N6C, WPT, N6B, WPP, N2N
*Lean burn engine configuration only
Step into the future of performance with the G3516J Uprate Kit. Caterpillar recognizes customers’ need to meet changing emissions standards and increase fuel flexibility. This kit enables the engine to run with up to 9% more power (from 1380bhp to 1500bhp), matching the current factory offering.
The upgrade consists of the latest performance hardware, including cuffed cylinder liner and extended life cylinder head, which has improved cooling passages and more robust valves and seats, along with updated engine software. There is also the option to lower emissions to 0.3 g/bhp-hr NOx through the use of a PC (prechambered) spark plug.
Advanced Hardware & Durability: Cuffed cylinder liners and robust cylinder heads extend service life and reduce maintenance.
Enhanced Thermal Management: Improved cooling passages ensure reliable, efficient engine operation.
Lower Emissions Option: Achieve 0.3 g/bhp-h NOx with a PC spark plug to meet regulatory needs.
Greater Fuel Flexibility: Maintain full performance down to 30 Cat methane numbers for stable combustion.
Optimized Combustion Control: Updated engine software for smoother and more efficient operation.
Applicable Engine Serial Number prefixes: N6W or engines updated to J configuration.
Transform your operator experience with a sleek 8” touchscreen HMI. This intuitive interface replaces outdated OCP panels, enabling faster diagnostics and reducing downtime. With minimal wiring changes, your team gains real-time insights and control, right at their fingertips.
The HMI retrofit kit provides a path for a G3500B/J engine to be upgraded from an existing operator control panel (OCP) based engine interface to an 8” HMI color display interface with touchscreen functionality. The HMI interface provides the ability for onsite personnel to perform troubleshooting and decreases the need for a physical connection to ET. If the kit installation is completed using the existing interconnect harness, some minor harness changes are required.
Faster Diagnostics: Intuitive display design enables quick fault identification, minimizing downtime and improving troubleshooting efficiency.
Seamless Retrofit: Minimal wiring changes required—easily adapts to existing OCP panel setups and supports use of current interconnect harnesses.
Enhanced Control & Flexibility: Supports both local and remote start/stop configurations, offering operational versatility.
Onsite Troubleshooting: Personnel can perform diagnostics directly on the HMI, reducing the need for external connections or additional devices.
Improved User Experience: Real-time insights and controls are accessible right at your fingertips, empowering operators for more effective engine management.
Applicable Engine Serial Number prefixes: G3508 - N8C, RBK, N8W; G3512 - N2S, JHH, N2W; G3516 - N6E, JEF, N6W; G3520 - TPC, GLF, N24, N22
Grant your engine more operating flexibility with the Ultra Lean Burn (ULB) and ADEM III upgrade for G3508, G3512, and G3516 engines. Applying the latest technologies to your engine not only will lengthen its lifespan but enhance the overall engine capabilities. Through the ULB and ADEM III features, such as efficiency control and easier tuning configurations, the following upgrade will have higher rated operating functions to make your product perform its best.
Convert G3508*, G3512*, or G3516* engines to Ultra Lean Burn (ULB) configuration with ADEM III controls. This kit includes integrated NOx sensors, AFRC for precise combustion, and enhanced tuning capabilities for altitude and fuel flexibility.
Integrated NOx Sensors: Monitor and manage emissions in real time for reliable compliance with environmental standards.
AFRC (Air-Fuel Ratio Control): Enjoy precise combustion control for consistently high performance across varying operating conditions.
Altitude and Fuel Flexibility: Benefit from improved tuning capabilities that support operation at higher altitudes and with a variety of fuel types without derate.
Improved Efficiency and Stability: improved fuel efficiency and combustion.
Operational Adaptability: Quickly adjust engine settings to meet changing demands or environmental conditions for greater application flexibility.
Applicable Engine Serial Number prefixes: 2JF*, 9TG, WPM, WPN, N8B, 4KC*, 7NJ, WPR, N2P, WPP, N2N, 3RC*, 4EK, WPW, N6C, WPT, N6B
*Lean burn engine configuration only
Help stay ahead of global emissions standards with a straightforward solution. This kit reduces NOx to 0.3 g/bhp-hr using a PC spark plug and updated software—no major hardware changes required.
Caterpillar recognizes that customers are working to keep up with changing emissions standards worldwide. The upgrade kit provides an emissions reduction to G3516B or G3516J engines to 0.3 g/bhp-h NOx with a prechamber spark plug (PC) and software to install. PC spark plugs have an advertised longer service interval than the J-Gap spark plugs.
Simple Retrofit Process: Achieve significant NOx emission reductions with an easy upgrade, just a spark plug and software change, with no need for major hardware modifications.
Emissions Compliance: Lower NOx emissions to just 0.3 g/bhp-h on G3516B or G3516J engines, positioning your operations ahead of global emissions standards.
Extended Maintenance Intervals: Benefit from prechamber (PC) spark plugs, which offer longer service life compared to traditional J-Gap spark plugs, reducing downtime and maintenance costs.
Optimized Engine Performance: Updated software ensures precise calibration of ignition timing and fuel delivery, maintaining engine reliability and efficiency while meeting stricter regulations.
Cost-Effective Solution: Upgrade your engine’s emissions performance without extensive hardware changes—making compliance more affordable and less disruptive.
Applicable Engine Serial Number prefixes: JEF, N6E
Upgrade to a water-cooled Dual Layer Shielded (DLS) exhaust manifold for reduced surface temperatures and improved safety. Maintain full power, torque, and fuel efficiency while operating at precise combustion settings with ADEM III and AFRC.
Optimize your product’s features with the G3500B Engine Water Cooled Dual Layer Shielded (DLS) Exhaust Manifold Upgrade Kit. This package utilizes the newest technology to reduce exhaust component temperatures while maintaining emissions, overall power usage, and fuel tolerance. The upgrade continues to utilize ADEMIII controls, an integrated air fuel ratio control (AFRC) system, and NOx sensors to allow engine operation at precise combustion settings.
Advanced Thermal Protection: Dual Layer Shielded (DLS) exhaust elbows and water-cooled manifolds significantly lower surface temperatures, providing enhanced safety for your operations.
Uncompromised Performance: Enjoy the same high power density, performance, and fuel efficiency as the G3500B engine, with no trade-off in capability.
Full Torque Capability: Maintain full torque and optimal speed turndown performance, ensuring your engine adapts seamlessly to varying operational demands.
Integrated Emissions Monitoring: The upgrade retains ADEM III controls, advanced air-fuel ratio control (AFRC), and NOx sensors, so you can monitor emissions in real time and maintain compliance with environmental standards.
Applicable Engine Serial Number prefixes: G3520- TPC, GLF, G3516- JEF, N6E G3512 - HH, N2S, G3508 - RBK, N8C
This emission reducing upgrade helps enable your G3508 & G3516 engine to meet NOx targets of 1.0 or 0.5 g/bhp-h while improving altitude and turndown capabilities. It’s a smart way to extend the life of your existing assets while staying compliant.
Lower Emissions Compliance: Meet strict NOx targets of 1.0 or 0.5 g/bhp-h, ensuring your operation stays ahead of environmental regulations.
Enhanced Altitude Performance: Enjoy reliable engine operation at higher altitudes, thanks to optimized capabilities at the 1400 rpm rating, with applicability at 1200 rpm as well.
Extended Equipment Life: more complete combustion reduces emissions and helps prolong the lifespan of existing assets.
Broader Turndown Capability: Improved fuel tolerance allows your engine to adapt easily to changing operational demands.
Applicable Engine Serial Number prefixes: WPN01500-up, N8B, N6C
The G3512 & G3516 Engine ADEM III (A3) Upgrade Kits are designed to elevate your engine’s performance, compliance, and reliability. Engineered for seamless integration, these kits update the engine to a new configuration featuring AFRC with NOx sensors, ensuring your equipment meets stringent environmental standards through more precise combustion control.
Advanced Combustion Control: A3, AFRC, and NOx sensors deliver precise combustion, simplified engine management, and real-time NOx feedback.
Improved Safety and Diagnostics: Enhanced shutdown logic and expanded diagnostic features via Remote Advisor Panel streamline troubleshooting and boost operational safety.
Applicable Engine Serial Number prefixes: G3512 - WPP, WPR; G3516 - WPT, WPW
Introducing the G3508 A3 Upgrade Kit—a comprehensive performance solution designed to take your engine’s output and operational reliability to new heights. Leveraging the latest advancements in turbocharger and emissions technology, this kit transforms your G3508 platform for higher power, greater efficiency, and enhanced emissions compliance.
Move More Gas: Unlock a boost in engine output, raising power from 630 bhp (470 bKw) to 670 bhp (500 bKw).
Single Turbo Configuration: Enjoy simplified maintenance and service with a streamlined single turbo layout, reducing complexity and downtime.
Advanced Air/Fuel Ratio Control (AFRC) with NOx Sensors: Thanks to integrated AFRC and NOx sensor technology, you can benefit from precise combustion management and reduced emissions.
Increased Altitude Capability: Maintain engine performance in high-altitude environments without derate, ensuring reliability wherever your equipment operates.
Applicable Engine Serial Number prefixes: WPN
G3508 ONLY (Single Turbo, AFRC & NOx Sensor)
G3512 & G3516 LE (AFRC & NOx Sensor)
Make an impact on the way your engine runs with the EIS to ADEM III Control System Upgrade Kit for G3500 LE engines. This bundle centralizes all engine needs into one cohesive control system fit for reliable performance and continued customer satisfaction.
Update your engine’s control system with the EIS to ADEM III upgrade. This kit simplifies wiring, enhances remote monitoring, and improves combustion control with AFRC and NOx sensors.
Simplified Engine System: Enjoy easier maintenance and quicker troubleshooting with a streamlined design and fewer terminal connections in the wiring harness.
Improved Performance: For G3508 engines, experience a power boost from 630 bhp (470 bKw) to 670 bhp (500 bkW) when upgrading from twin turbo to single turbo, delivering more reliable engine performance.
Advanced Combustion Control: Benefit from precise air/fuel ratio management with integrated AFRC and NOx sensors, ensuring optimal combustion and lower emissions.
Centralized Engine Management: Gain confidence with all your engine’s needs centralized into a cohesive control system designed for reliability.
Remote Monitoring & Diagnostics: Monitor engine parameters and diagnostic codes from afar, empowering you to address issues promptly and keep operations running smoothly.
User-Friendly Advisor Display: Quickly access critical engine data and system alerts, enabling faster and easier troubleshooting for minimized downtime.
Applicable Engine Serial Number prefixes: G3508- 9TG, G3512 - 7NJ; G3516 - 4EK
Protect your Cat® powered equipment to ensure a longer engine life and maximize your investment.
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