Engine whilstling / services belt noisy
- Make
- Alfa Romeo
- Model
- 147 Factory Service Manual
- Year
- 2000–2004
- Section
- Noisy / vibrations › Engine whilstling / services belt noisy
Fault diagnosisEngine whilstling / services belt noisy
ENGINE WHILSTLING / SERVICES BELT NOISY
A high frequency noise is heard from the engine, whose intensity varies with the number of revs
| Results of the tests | ||||
| 0 | PRELIMINARY CHECKS | All OK | Problems met | Operation |
|---|---|---|---|---|
Check the condition of the auxiliary drive belt and check that the tension is correct. See if the whistling stays constant as more electrical loads are conneced. | Continue to Step 1 | Belt worn. | Replace the belt Op. 1092G10 | |
| Tension incorrect | Adjust belt tension | |||
| The whistling noise increases. | Continue to Step 1 | |||
| 1 | CHECKING ALTERNATOR | All OK | Problems met | Operation |
Check that the alternator is working properly, in particular
| Continue to Step 2 | Defective voltage regulator | Replace the alternator Op. 5530A10 | |
| Connections not correct | Restore connections | |||
| 2 | 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 3 | The whistling disappears: | Continue to Step 3 | |
| The whistling remains constant | Continue to Step 4 | |||
| 3 | CHECKING AIR CONDITIONER COMPRESSOR | All OK | Problems met | Operation |
| Check the air conditioner air conditioner compressor is working properly. | Continue to Step 4 | Air conditioning compressor faulty | Repair or replace the compressor Op. 5040A20 | |
| 4 | CHECKING BELT TENSION | All OK | Problems met | Operation |
| Check the condition of the belt tensioner bearings | Continue to Step 5 | Fixed belt tensioner fault | Replace the fixed belt tensioner Op. 1092G20 | |
| Mobile belt tensioner fault | Replace the mobile belt tensioner Op. 1092G14 | |||
| 5 | 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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