Engine buzzing
- Make
- Alfa Romeo
- Model
- 147 Factory Service Manual
- Year
- 2000–2004
- Section
- Noisy / vibrations › Engine buzzing
Fault diagnosisEngine buzzing
ENGINE BUZZING
There is a constant, loud noise coming from the area of the engine, which is repeated at constant intervals
| Results of the tests | ||||
| 1 | CHECKING AUXILIARY DRIVE BELT | All OK | Problems met | Operation |
|---|---|---|---|---|
Check whether the whistling disappears when the belt is disconnected. Do not let the engine run for long with the belt disconnected | Continue to Step 2 | The whistling disappears: | See table S10 ENGINE WHILSTLING / SERVICES BELT NOISY | |
| The whistling remains constant | Continue to Step 2 | |||
| 2 | CHECKING ALTERNATOR | All OK | Problems met | Operation |
Check the alternator and, in particular
| Continue to Step 3 | Alternator bearing damaged | Overhaul the alternator Op. 5530A18 | |
| Pulley fixing not correct | Restore the correct pulley fastening Op. 5530A30 | |||
| 3 | CHECK TIMING BELT TENSION | All OK | Problems met | Operation |
| Check the belt is not too taut | Continue to Step 4 | Belt tension excessive | Restore correct tension | |
| 4 | CHECK TIMING BELT TENSIONER | All OK | Problems met | Operation |
| Check the belt tensioners and, in particular, the condition of the bearings | Continue to Step 5 | Fixed belt tensioner bearing damaged | Replace the fixed belt tensioner Op. 1092G20 | |
| Mobile belt tensioner bearing damaged | Change the mobile belt tensioner Op. 1092G14 | |||
| 5 | WATER PUMP CHECK | All OK | Problems met | Operation |
| Check the water pump and, in particular the condition of the bearing | Continue to Step 6 | Water pump bearing damaged | Replace the water pump Op. 1088C10 | |
| 6 | CHECK ON CORRECT OPERATION | All OK | Problems met | Operation |
| Check that the fault is no longer present | Fault persists | Search for the fault starting from another symptom' | ||
Parts & tools for this job For 2000 Alfa Romeo 147
- PARTEngine gasket setSearch: Alfa Romeo 147 2000 engine gasket set
- TOOLTorque wrenchSearch: 3/8 inch torque wrench
- TOOLFeeler gauge setSearch: feeler gauge set
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