Exhaust Has Excessive Black Smoke
Check for the following problems if there is excessive black exhaust smoke.
- Air inlet or exhaust system
- Atmospheric pressure sensor
- Flash file
- Fuel quality
- Valve adjustment
Show/hide table
| Troubleshooting Test Steps | Values | Results |
|---|---|---|
1. Air Inlet or Exhaust System A. Check the air inlet system for restrictions and/or for leaks. B. Check for an air filter restriction. C. Perform a visual inspection of the system for restrictions and/or for leaks in the air inlet piping. D. Ensure that the turbocharger is in good repair. E. Check the exhaust system for restrictions. |
Air Inlet or Exhaust System |
Result: There are no signs of damage or failure in the air inlet or exhaust system. Proceed to Test Step 2. Result: There are signs of damage or failure in the air inlet or exhaust system. Repair: Repair the air inlet or exhaust system. |
2. Atmospheric Pressure Sensor A. Remove the sensor. B. Remove debris, moisture, or ice from the sensor. C. Install the sensor. D. Check the Caterpillar Electronic Technician (ET) for active diagnostic codes on the sensor. If no active diagnostic code exists, the sensor may be used. The correct reading for the atmospheric pressure is between |
Atmospheric Pressure Sensor |
Result: There are no codes present for the Atmospheric Pressure Sensor. Proceed to Test Step 3. Result: There are codes present for the Atmospheric Pressure Sensor. Repair: Troubleshoot the codes before continuing with this procedure. |
3. Flash File A. Verify that the latest flash file is installed. Refer to Troubleshooting, "ECM Software - Install" for information. |
Flash File |
Result: The latest flash file is installed. Proceed to Test Step 4. Result The latest flash file is not installed. Repair: Install the correct flash file. Verify that the problem has been resolved. |
4. Fuel Quality A. Cold weather adversely affects the characteristics of the fuel. Refer to Operation and Maintenance Manual for information on improving the characteristics of the fuel during cold-weather operation. |
Fuel Quality |
Result The fuel quality is within the engine specifications. Proceed to Test Step 5. Result The fuel quality is not within the engine specifications. Repair: Replace the fuel with fuel that is within the engine specifications. Verify that the problem has been resolved. |
5. Valve Adjustment A. Check the valve adjustment. Refer to Systems Operation/Testing and Adjusting for information that is related to valve adjustments. |
Valve Adjustment |
Result The valve adjustment is not within engine specifications. Repair: Make the appropriate adjustment. Verify that the problem has been resolved. |
Caterpillar Information System:
C27 and C32 Engines for Caterpillar Built Machines Engine Overspeeds
14L Motor Grader Solenoid Valve (ARD Fuel) - Remove and Install - Main
966M and 972M Wheel Loaders Power Train, Steering, Braking, Hydraulic, and Machine Systems General Information (Power Train System)
994K Wheel Loader Commissioning Procedure {0374, 1000, 7000, 7960, 7961} 994K Wheel Loader Commissioning Procedure {0374, 1000, 7000, 7960, 7961}
2013/11/04 New Ferrite Bead and Relay Harness Is Now Available For Certain Generator Sets Equipped With PL421 {4450, 7606}
Cat® Terrain v5 for Grading and Loading Truck Load Windows
14L Motor Grader Pressure Sensor (DPF) - Remove and Install
14L Motor Grader Clean Emissions Module - Remove and Install
2013/10/25 Machine Engine ECM Clearing Process for Dealers Is Now Available on Certain Applications {1901, 1920}
966M and 972M Wheel Loaders Power Train, Steering, Braking, Hydraulic, and Machine Systems General Information (Brake System)
Comfort Series Seat For Caterpillar Machines Troubleshooting
777G Off-Highway Truck Hydraulic and Braking System Parking and Secondary Brake Release System Leakage - Check
14L Motor Grader Solenoid Valve (ARD Fuel) - Remove and Install - Pilot
988K Wheel Loader, 834K Wheel Dozer and 836K Compactor Machine Systems Steering Neutralizer Valve - Remove and Install
Installation of the 351-8997 Air Lines Gp for Certain 797F Off-Highway Truck Engines{1071} Installation of the 351-8997 Air Lines Gp for Certain 797F Off-Highway Truck Engines{1071}
14L Motor Grader Temperature Sensor (Catalyst Inlet) - Remove and Install
770G and 772G Off-Highway Truck Systems Control Manifold (Steering) - Test and Adjust
770G and 772G Off-Highway Truck Systems Piston Pump (Steering) Pressure - Test and Adjust
2014/01/14 A New Torsional Coupling Assembly and Flywheel Is Now Used on Certain 14M and 16M Motor Graders {3252, 3279}
C7 and C9 Industrial Engines Power Is Intermittently Low or Power Cutout Is Intermittent
994K Wheel Loader Stairway (Powered) Operation - If Equipped
2013/11/21 New Ether Aid Line Components Are Used On Certain C175 Off-Highway Truck Engines {1456}
770G and 772G Off-Highway Truck Systems Rear Suspension (Cylinder) - Purge and Charge
14L Motor Grader Engine - Remove and Install