In this video, we'll show you how to replace the alternator for an E90 320i with an N46 engine.
Symptoms for a broken alternator are a red battery symbol. If the car does sometimes not start up even though the battery is not old and not subject to short distance drives, it could also be the alternator.
In some cases, only the alternator pulley is broken. However, the special tools plus the pully is only a bit cheaper than an overhauled alternator. As the alternator is a carbon brush motor and thus subject to wear, it makes sense to just replace it.
Part numbers:
➥ Alternator: 12317533270 (e.g. Bosch eXChange Program)
➥ Guide Pulley: 11281440378
Required tools:
➥ Socket size 10, 13, 17
➥ Socket extensions
➥ Slotted screwdriver
➥ Allen key to lock the tensioner (minimum size 3! It can break otherwise)
Tightening torques:
➥ Alternator screws: 19 Nm
➥ Guide pulley: 40 Nm
✔ Requirements
➥ Engine code N40, N42, N45, N46
Cost of repair: ~200 EUR
Difficulty: Easy
Attention: The V-belt tensioner has a high spring tension!
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