V-BELT 1358652 - Caterpillar

Probable Causes
Codes
Needle valves
Check valve
Parameters
Inlet air restriction
Light loads
Thermocouple
Valve lash
Low compressionRecommended Actions
Table 4
Troubleshooting Test Steps Values Results
1. Check for Codes
A. Connect Cat® Electronic Technician (ET) to the service tool connector.
B. Look for active codes that are associated with the system for the event code.
Codes
Result: An associated code is active.
Repair: Troubleshoot any associated codes before continuing with this test.
Result: A code is active or logged.
Proceed to Test Step 2.
2. Check the Needle Valves Adjustments
If the setting for the fuel's LHV is too low, the air/fuel ratio will be too rich.
A. If the needle valves require adjustment, do the following procedure:
- Fully close all of the needle valves.
- Open all of the needle valves 2.5 turns.
- Enter "Engine Prechamber Calibration" mode in Cat ET.
- Record engine average burn time.
- Adjust each needle valve until all cylinders' burn times are within +/- 0.12 milliseconds of the engine average burn time.
- Exit "Engine Prechamber Calibration" mode.
Note: The recommended position of the needle valve is 2.5 turns open.
Needle Valves
Result: The needle valves are OK.
Proceed to Test Step 3.
Result: The needle valves are NOT OK.
Repair: Adjust the needle valves to the correct setting. Refer to Testing and Adjusting, "BTU and Precombustion Chamber Adjustments" for additional information.
If the problem is not resolved, proceed to Test Step 3.
3. Inspect the Check Valve
Note: The check valve may be stuck. The check valve must move freely in order to prevent fuel from continuously entering the precombustion chamber.
Check Valve
Result: The check valve is OK.
Proceed to Test Step 4.
Result: The check valve is NOT OK.
Repair: Clean or replace the check valve. Clean with a nonflammable solvent that will not leave residue.
If the problem is not resolved, proceed to Test Step 4.
4. Check for Incorrect Monitoring System Parameters
A. Connect Cat ET.
B. Use Cat ET to verify that the correct parameters are being used.
- Exhaust temperature module
- Exhaust port temperatures
Parameters
Result: The parameters are correct.
Proceed to Test Step 5.
Result: The parameters are not correct.
Repair: Input the correct parameters. Refer to Troubleshooting, "Event Codes" for additional information.
If the problem is not resolved, proceed to Test Step 5.
5. Check for Inlet Air Restriction
Note: Inlet air restriction can cause uneven exhaust port temperatures. Cylinders at the front half of the engine may have exhaust port temperatures that are lower than the exhaust port temperatures for the cylinders at the rear half of the engine by 10 to 20 °C (18 to 36 °F).
A. Check the air filter restriction indicator, if equipped. Refer to the Operation and Maintenance Manual for additional information.
B. Measure the inlet air restriction for each turbocharger. Refer to Troubleshooting, "Inlet Air Is Restricted" for additional information.
Restriction
Result: The inlet air restriction is OK.
Proceed to Test Step 6.
Result: The inlet air restriction is NOT OK. An imbalance in the system is discovered.
Repair: Repair or replace damaged inlet air system components. Equalize the inlet air restriction for each of the turbochargers.
If the problem is not resolved, proceed to Test Step 6.
6. Check for a Cylinder Misfire
Note: Operation with a low load can result in low exhaust temperatures.
A. Operate