3022723 - S12 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.
| 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' | ||||
