Emission Control Systems for Cummins C Series Engines (6C, 6CT, 6CTA) (1991 and 1994 Certification Levels)

February 10, 2025

Introduction


1. Components of the Emission Control System


A. Exhaust Gas Recirculation (EGR) System


B. Diesel Oxidation Catalyst (DOC)


C. Particulate Filter (DPF)


D. Turbocharger with Aftercooler


E. Fuel Injection System


2. Servicing Emission-Related Parts for Compliance


A. EGR System Maintenance


B. Diesel Oxidation Catalyst (DOC) Service


C. Fuel Injection System Maintenance


D. Turbocharger and Aftercooler Service


3. Common Issues and Solutions


A. Excessive NOx Emissions


B. Increased Particulate Matter (PM) Emissions


C. Poor Fuel Economy


D. Rough Idling or Engine Hesitation


E. Fault Codes and Diagnostic Troubleshooting


Proactive Tips for Emission System Longevity


Conclusion


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Comparing 1991 and 1994 Certification Levels for Cummins C Series Engines (6C, 6CT, 6CTA)

February 10, 2025

Introduction


This guide explores:


1. Emission Standards and Compliance Differences


A. Background on Emission Regulations


B. 1991 Certification Level


C. 1994 Certification Level


D. Key Compliance Differences


2. Modifications Required for Each Certification Level


A. Modifications for 1991 Certification Engines


B. Modifications for 1994 Certification Engines


C. Retrofit Options for Older Engines


3. Maintenance Implications for Both Certifications


A. Maintenance for 1991 Certified Engines


B. Maintenance for 1994 Certified Engines


C. Key Differences in Maintenance Requirements


Conclusion


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Engine Overhaul Basics for Cummins C Series Engines (6C, 6CT, 6CTA)

February 10, 2025

Introduction


This guide covers:


1. Deciding Between a Rebuild and Replacement


A. When to Choose an Overhaul (Rebuild)


B. When to Consider Engine Replacement


2. Key Steps in Overhauling a Cummins C Series Engine


A. Preparation


B. Engine Disassembly


C. Cleaning and Inspection


D. Reassembly with Diesel Pro Power Overhaul Kits


3. Post-Overhaul Testing and Inspection


A. Initial Testing


B. Break-In Procedure


C. Post-Overhaul Inspection


Conclusion


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Valve and Cylinder Head Maintenance for Cummins C Series Engines (6C, 6CT, 6CTA) (1991 and 1994 Certification Levels)

February 10, 2025

Introduction


1. How to Remove, Inspect, and Service the Cylinder Head


A. Removing the Cylinder Head


B. Inspecting the Cylinder Head


C. Servicing the Cylinder Head


2. Valve Adjustments and Common Cylinder Head Issues


A. Valve Adjustment Procedure


B. Common Cylinder Head Issues


3. Recognizing Signs of Damage


A. Symptoms of Cylinder Head Damage


B. Diagnostic Techniques


Conclusion


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Air Intake and Turbocharger Systems for Cummins C Series Engines (6C, 6CT, 6CTA) (1991 and 1994 Certification Levels)

February 10, 2025

Introduction


1. Maintaining Clean Air Filters and Ducts


A. The Role of the Air Intake System


B. Importance of Maintaining Clean Air Filters and Ducts


C. Air Filter Maintenance


D. Maintaining Air Intake Ducts


2. Servicing Turbochargers to Maximize Engine Efficiency


A. How the Turbocharger Works


B. Key Components of the Turbocharger


C. Turbocharger Maintenance Procedures


D. Rebuilding the Turbocharger


3. Diagnosing Air-Related Performance Issues


A. Common Air Intake Problems and Symptoms


B. Diagnostic Procedures


C. Resolving Air Intake and Turbo Issues


Proactive Maintenance Tips


Conclusion


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Lubrication and Cooling Systems for Cummins C Series Engines (6C, 6CT, 6CTA) (1991 and 1994 Certification Levels)

February 10, 2025

Introduction


This guide covers:


1. The Importance of Lubrication in Engine Longevity


A. How the Lubrication System Works


B. Why Lubrication is Essential for Longevity


2. Inspecting and Servicing the Oil and Cooling Systems


A. Inspecting the Lubrication System


B. Inspecting the Cooling System


3. Preventing Overheating Through Regular Maintenance


A. Common Causes of Overheating


B. Cooling System Maintenance Schedule


C. Steps to Prevent Overheating


Conclusion


Key takeaways:


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