Symptom Tree t048
| Cause | Correction |
|---|
Refer to Engine Noise Diagnostic Procedures — General Information at the end of this section before using this symptom tree.
|
Engine is operating at low ambient temperature |
Check the winterfront, shutters, and under-the-hood air. Use under-the-hood intake air in cold weather. Refer to Operation of Diesel Engines in Cold Climates, Bulletin 3379009. |
 |
|
Coolant temperature is below specification |
Refer to the Coolant Temperature Below Normal symptom tree. |
|
|
Ether starting aid is malfunctioning |
Repair or replace the ether starting aids. Refer to the manufacturer’s instructions. |
|
|
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. |
|
|
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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|
Overhead adjustments are not correct |
Adjust the overhead settings. Refer to Procedure 003-004. |
