Symptom Tree t051
| Cause | Correction |
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Refer to Engine Noise Diagnostic Procedures – General Information at the end of Section TS before using this symptom tree.
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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. |
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Overhead adjustments are not correct |
Measure and adjust the overhead settings. Refer to Procedure 003-004. |
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|
Injector is malfunctioning |
Perform the single-cylinder cutout test. Replace the injectors as necessary. Refer to Procedures 006-005 and 006-026. |
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Carbon deposits on the top of the pistons are contacting the cylinder head |
Remove the cylinder head and check for carbon deposits on the pistons. If deposits are excessive, remove and clean the pistons. Check the piston rings for damage or wear. Refer to Procedures 002-004, 001-054, 001-043, and 001-047. |
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|
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. |
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|
Piston, piston rings, or cylinder liner is worn or damaged |
Inspect the air intake system for leads. Refer to Procedures 001-043, 001-047, and 001-028. |
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|
Connecting rod is bent or out of alignment |
Remove and inspect the connecting rods. Refer to Procedure 001-014. |
