S12 Cyclic engine roar
- Make
- Fiat
- Model
- Seicento Factory Service Manual
- Year
- 1998–2010
- Section
- Noise and vibration › S12 Cyclic engine roar
DiagnosisS12 Cyclic engine roar
S12 Cyclic engine roar
A noise is heard at high and constant intensity leading from the engine area which is repeated at constant intervals
Preliminarily check:
- auxiliary unit belt correct tension
| Step | Validity | Operation to be performed | Test results | ||
|---|---|---|---|---|---|
| OK | ⚠ | 🔧 | |||
| 1 | CHECK AUXILIARY UNIT BELT | All OK | Problems found | Intervention | |
| Check whether, disconnecting the belt, the fault persists | Go to Step 2 | Cyclic roar is constant | Restore correct belt tension | ||
| 2 | CHECK WATER PUMP | All OK | Problems found | Intervention | |
| Check water pump and, in particular, bearing intactness | Go to Step 3 | Damaged water pump bearing | Replace water pump PROCEDURE OP. 1088C10 |
||
| 3 | CHECK ALTERNATOR | All OK | Problems found | Intervention | |
| Check alternator and, in particular: - intactness of respective bearing - correct fastening of pulley |
Go to Step 4 | Damaged alternator bearing | Replace alternator PROCEDURE OP. 5530A10 (PROCEDURE OP. 5530A14 versions with air conditioner) |
||
| Incorrect pulley fastening | Restore correct pulley fastening PROCEDURE OP. 5530A30 |
||||
| 4 | CHECK CORRECT OPERATION | All OK | Problems found | Intervention | |
| Check the fault is no longer present | End of test | Fault persists | Seek the fault starting from another symptom (the noise was not interpreted correctly: see Glossary) | ||
Parts & tools for this job For 1998 Fiat Seicento
- PARTEngine gasket setSearch: Fiat Seicento 1998 engine gasket set
- TOOLTorque wrenchSearch: 3/8 inch torque wrench
- TOOLFeeler gauge setSearch: feeler gauge set
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