S10 Engine whistling / unit belt noise
- Make
- Alfa Romeo
- Model
- 156 Factory Service Manual
- Year
- 1997–2002
- Section
- Noise/vibrations › S10 Engine whistling / unit belt noise
S10 Engine whistling / unit belt noise
There is a whistling (extremely high intensity noise) coming from the area of the engine which varies with the engine speed
| Step | Test procedure | Result | Action |
|---|---|---|---|
| 0 | PRELIMINARY CHECKS Check the condition of the auxiliary shaft drive belt and check that the tension is correct Check that, as the electrical loads engaged increase, the whistling does not increase, but remains constant | OK | |
| Tension incorrect |
End of diagnosis | ||
| The whistling increases: alternator faulty (voltage regulator not working properly) |
End of diagnosis | ||
| The whistling increases: alternator faulty (connections between alternator and battery not correct) |
End of diagnosis | ||
| 1 | CHECK AUXILIARY SHAFT BELT Disconnect the belt to see if the whistling stops. ATTENTION do not run the engine too long with the belt disconnected | OK | |
| The whistling remains constant |
End of diagnosis | ||
| 2 | CHECK ON COMPONENTS DRIVEN BY THE BELT Check the operation of all the components driven by the belt:
| OK | |
| Water pump faulty |
End of diagnosis | ||
| Power assisted steering pump faulty |
End of diagnosis | ||
| Air conditioning compressor faulty |
End of diagnosis | ||
| 3 | CHECK CORRECT OPERATION Check that the fault is no longer present | OK | End of diagnosis |
| Fault persists | Incorrect selection of diagnostic procedure |
Parts & tools for this job For 1997 Alfa Romeo 156
- PARTEngine gasket setSearch: Alfa Romeo 156 1997 engine gasket set
- TOOLTorque wrenchSearch: 3/8 inch torque wrench
- TOOLFeeler gauge setSearch: feeler gauge set
Links open Amazon search results in a new tab. As an Amazon Associate I earn from qualifying purchases.