Symptom Tree t051
| Cause | Correction |
|---|
Refer to Engine Noise Diagnostic Procedures – General Information at the end of Section TS before using this symptom tree.
Listen to the engine before using this symptom tree. Listen for a light tapping noise, which is more noticeable with no load on the engine. Piston noise can usually be noticed when the engine is decelerating.
|
Electronic fault codes active or high counts of inactive fault codes |
Refer to Section TF in the Troubleshooting and Repair Manual, Fuel Systems and Electronics, B5.9G, C8.3G, L10G-III, Bulletin 3666118, for fault code troubleshooting. |
 |
|
Fuel grade is not correct for the application or the fuel quality is poor |
Operate the engine from a tank of high-quality fuel. Refer to Fuels for Cummins Engines, Bulletin 3379001. |
|
|
Overhead adjustments are not correct |
Measure and adjust the overhead settings. Refer to Procedure 003-004. |
|
|
Piston pin or bushing is loose, worn, or not installed correctly |
Remove the pistons and inspect the piston pin and bushing for damage, wear, and correct installation. Refer to Procedure 001-043. |
|
|
Piston, cylinder liner, or piston rings are worn or damaged |
Check for air intake system leaks. Refer to Procedure 010-024. Check the pistons, piston rings, and liners for wear or damage. Refer to Procedures 001-043 and 001-047. |
|
|
Connecting rod is bent or out of alignment |
Remove and inspect the connecting rods. Refer to Procedure 001-014 and the B Series Shop Manual, Bulletin 3666017. |
