PLATE 6G4848 - Caterpillar

Probable Causes
Diagnostic Trouble Codes
Active codes and logged codesFuel Supply
Low quality fuelFuel Injection
InjectorsLubrication
Lack of lubricationEngine Components
Valve train components
Gear train and engine drive trainRecommended Actions
Note: The procedures have been listed in order of probability. Complete the following procedures in the order that is provided.Active Codes and Logged Codes
Establish communication between Caterpillar Electronic Technician (ET) and the Electronic Control Module (ECM).Download the "Product Summary Report" from the engine ECM before performing any troubleshooting or clearing diagnostic trouble codes.Troubleshoot any active codes before continuing with this procedure.Low Quality Fuel
Refer to Operation and Maintenance Manual for information on the proper characteristics of the fuel for the engine. If necessary, obtain a fuel analysis in order to confirm that the correct fuel is being used for the engine.Injectors
Start the engine.
Access the "Cylinder Cutout Test" in the "Diagnostic Tests" under the "Diagnostics" menu.
Select the "Automatic Cylinder Cutout Test" on Cat ET.
Start the test. Diagnose the problem and then repair the problem. Clear all logged diagnostic codes. Verify that the repair eliminated the problem. Lack of lubrication
Check for proper lubrication of the valve components. Check for sufficient lubrication at the rocker arms for the injectors.
Check for blocked oil passages. Oil passages must be clean. Clean any oil passages that are questionable. Refer to the Disassembly and Assembly for additional information. Valve Train Components
Check the valve lash. Refer to Troubleshooting, "Valve Lash Is Excessive".
Check for damage to valve train components. Remove the valve cover from the suspect cylinder(s). Check the following items for damage: camshaft, valve rotocoil, valve springs, camshaft followers, rocker shaft, bridges and injectors. Refer to the Disassembly and Assembly for additional information.
Check for valves that do not move freely. Remove the cylinder head and inspect the valves. Refer to the Disassembly and Assembly for additional information.Replace any damaged parts. If damage has occurred, ensure that the following components are free of contamination: cylinder liner, piston and exhaust system. Replace any damaged parts.Gear Train and Engine Drive Train
Inspect the gear train and the engine's drive train. Replace any damaged parts.