Symptom Tree t051
| Cause | Correction |
|---|
Refer to Engine Noise Diagnostic Procedures — General Information at the end of this section before using this symptom tree.
|
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 the Fuel for Cummins Engines, Bulletin 3379001. |
 |
|
Overhead adjustments are not correct |
Adjust the overhead settings. Refer to Procedure 003-004. |
|
|
Injector is malfunctioning |
Perform the single-cylinder cutout test. Replace the injectors as necessary. Refer to Procedures 006-005 and 006-026. |
|
|
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. |
|
|
Cylinder liner, pistons, or piston rings are worn or damaged |
Check the pistons, piston rings, and cylinder liner. Refer to Procedures 001-043, 001-047, and 001-028. |
|
|
Connecting rod is bent or out of alignment |
Remove and inspect the connecting rods. Refer to Procedure 001-014 and the Shop Manual M11 and ISM Engines, Bulletin 3666075. |
