V-BELT 9L6125 - Caterpillar

Probable Causes
Active codes and logged codes
Low quality fuel
Injectors
Lack of lubrication
Valve train components
Gear train and components of the lower endRecommended Actions
Note: The procedures have been listed in order of probability. Complete the procedures in order.
Table 1
Troubleshooting Test Steps Values Results
1. Active Codes and Logged Codes
A. Establish communication between Cat® Electronic Technician (ET) and the Electronic Control Module (ECM).
B. Download the "Warranty Report" from the engine ECM before performing any troubleshooting or clearing diagnostic trouble codes.
Codes
Result: A diagnostic trouble code is not active or logged.
Proceed to Test Step 2.
Result: A diagnostic trouble code is active or logged.
Troubleshoot the active or logged codes.
If the problem is not resolved, proceed to Test Step 2.
2. Low Quality Fuel
A. 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. Refer to Systems Operation/Testing and Adjusting, "Fuel System Quality Test" for the proper procedure.
Fuel
Result: The fuel quality is OK.
Proceed to Test Step 3.
Result: The fuel quality is not OK.
Repair: Replace the fuel.
If the problem is not resolved, proceed to Test Step 3.
3. Inspect the Injectors
A. Perform the "Injector Solenoid Test" on Cat ET in order to determine if all of the injector solenoids are being energized by the ECM.
B. Access the "Cylinder Cutout Test" in the "Diagnostic Tests" under the "Diagnostics" menu.
C. Perform the "Automatic Cylinder Cutout Test" on Cat ET.
Injector Solenoid Test or Fuel System Verification Test
Result: The test was successful.
Proceed to Test Step 4.
Result: The test was not successful.
Repair: Diagnose the problem and then repair the problem. Reset all active codes and clear all logged codes.
If the problem is not resolved, proceed to Test Step 4.
4. Lack of Lubrication
A. Check for proper lubrication of the valve components
B. 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.
Lubrication
Result: The oil passages are OK.
Proceed to Test Step 5.
Result: The oil passages are NOT OK.
Repair: Make the necessary repairs.
If the problem is not resolved, proceed to Test Step 5.
5. Valve Train Components
A. Check the valve lash. Refer to Troubleshooting, "Valve Lash Is Excessive".
B. Check for damage to valve train components. Remove the valve cover from the suspect cylinders. Check the following items for damage:
1. Camshaft
2. Valve rotocoil
3. Valve springs
4. Camshaft followers
5. Rocker shaft
4. Bridges
5. Pushrods
Refer to the Disassembly and Assembly for additional information.
C. 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.
Valve train
Result: The valve train components are not damaged.
Proceed to Test Step 6.
Result: The valve train components are damaged.
Repair: Make the necessary repairs.
If the problem is not resolved, proceed to Test Step 6.
6. Gear Train and Components of the Lower End
A. Inspect the gear train and lower end components.
Gear train
Result: The gear train or lower end components are damaged.
Repair: Replace any damaged parts.