Symptom Tree t051
Cause | Correction |
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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 Recommendations , Bulletin 3379001. |
Overhead adjustments are not correct |
Measure and 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 Procedure 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. |