February 25, 2025
What is Air-to-Fuel Ratio (AFR)? How AFR Works in Diesel Engines Effects of AFR on Engine Performance AFR in Detroit Diesel 92 Series Engines Key Parameters Affecting AFR Fuel Injector Selection Boost Pressure from Turbocharger Blower Drive Ratio Exhaust Backpressure Governor and Fuel Modulation Optimal AFR and Engine Performance in Detroit Diesel 92 Series Engines Ideal AFR for Diesel Combustion Effects of Incorrect AFR Effects of a Rich AFR (Low Air-to-Fuel Ratio) Symptoms of a Rich AFR: Common Causes of a Rich AFR: Effects of a Lean AFR (High Air-to-Fuel Ratio) Symptoms of a Lean AFR: Common Causes of a Lean AFR: Maintenance Tips to Ensure Proper AFR Air Intake System Maintenance Fuel System Maintenance Exhaust System Maintenance Why Maintaining an Optimal AFR Matters Read More
February 24, 2025
What the Camshaft Drives Camshaft Bearings and Lubrication Key Points for Proper Camshaft Bearing Maintenance: Camshaft Removal and Inspection Removal Procedure Inspection Criteria Camshaft Installation Procedure Step 1: Lubricate Bearings and Camshaft Lobes Step 2: Align Camshaft Timing Marks Step 3: Carefully Insert the Camshaft Step 4: Reinstall Retaining Bolts and Gear Cover Step 5: Reassemble Injectors, Rockers, and Valve Covers Final Checks Before Engine Startup Camshaft Timing and Adjustment Steps for Proper Timing Additional Timing Considerations Common Camshaft Issues and Troubleshooting 1. Excessive Wear on Lobes 2. Noisy Valve Train 3. Engine Misfires 4. Metal Shavings in Oil Preventive Maintenance for Camshafts Read More
February 19, 2025
Introduction Summary 1. Fuel System Problems Symptoms: Causes: Solutions: 2. Overheating Issues Symptoms: Causes: Solutions: 3. Turbocharger Problems Symptoms: Causes: Solutions: 4. EGR (Exhaust Gas Recirculation) System Issues Symptoms: Causes: Solutions: 5. Crankshaft Position Sensor Failure Symptoms: Causes: Solutions: 6. Electrical Problems Symptoms: Causes: Solutions: 7. Cylinder Head Gasket Failure Symptoms: Causes: Solutions: 8. DPF (Diesel Particulate Filter) Clogging Symptoms: Causes: Solutions: 9. Oil Leaks Symptoms: Causes: Solutions: Preventative Maintenance for the Cummins QSL 9 Conclusion Read More
February 19, 2025
Cummins Engine Torque Specifications by Model Cummins 6B, 6BT, and 6BTA 5.9L Torque Specs Cummins 4BT Torque Specs Cummins 6C, 6CT, and 6CTA 8.3 Torque Specs Cummins QSB 6.7L Torque Specs Cummins QSC 8.3L Torque Specs Cummins ISC 8.3 Torque Specs Cummins ISL 8.9L Torque Specs Cummins ISX Torque Specs Cummins KTA 19 Torque Specs Cummins N14 Torque Specs Cummins 855 Torque Specs Why Torque Specs Matter 1. Prevents Bolt Over-Tightening 2. Prevents Under-Torquing 3. Ensures Even Clamping Pressure 4. Prevents Fastener Fatigue and Improves Serviceability 5. Improves Performance and Efficiency Read More
February 17, 2025
Introduction Understanding Piston Rings and Their Functions Preparation for Piston Ring Installation 1. Gather Necessary Tools and Materials 2. Inspect the Piston and Rings 3. Verify Ring Gap Clearance Lubrication Before Installing Installing the Compression Rings 1. Identify the Rings 2. Installation Sequence 2. Expand the Rings for Installation 3. Position the Rings in the Correct Grooves 4. Stagger the Ring Gaps Installing the Oil Control Ring 1. Install the Oil Control Expander 2. Install the Oil Control Rings 3. Verify the Positioning of the Oil Rings 4. Stagger the Ring Gaps Final Checks Before Piston Installation 1. Ensure Proper Movement 2. Check the Gaps Again 3. Lubricate the Rings Note: For high-output marine and military engines, the top oil control ring must be installed in an inverted position, with the scraper edge facing up. This ensures proper oil control under high-performance conditions. Installing the Piston into the Cylinder 1. Use a Ring Compressor 2. Insert the Piston Carefully 3. Verify Piston Movement Post-Installation Checks 1. Rotate the Crankshaft 2. Check for Proper Oil Distribution 3. Perform a Leak-Down Test Conclusion Read More
February 14, 2025
Introduction 1. The Hidden Costs of Machine Shop Repairs A. Labor Costs Add Up Quickly B. Additional Parts May Be Needed 2. Downtime: How Machine Shop Delays Cost You Money A. Machine Shop Lead Times Are Unpredictable B. Reassembly and Installation Delays 3. The Risk of Rebuilt Cylinder Heads Failing Prematurely A. Cracks and Warping Are Hard to Fully Repair B. Injector Seat and Valve Issues in Rebuilt Heads 4. Modern Aftermarket Cylinder Heads Meet or Exceed OEM Standards A. Manufactured with Modern Materials and Processes B. OEM Matching or Improved Performance 5. When Buying a New Cylinder Head Is the Best Option 6. Where to Buy a High-Quality Aftermarket Cylinder Head for Detroit Diesel Engines Conclusion: The Smarter Choice for Cylinder Head Replacement Read More
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