12 31 020 Removing and installing or replacing alternator (S55)
Only perform this repair work on an engine that has cooled down.
Necessary preliminary work:
- Switch off ignition.
- Disconnect BATTERY EARTH LEAD
- Remove UNDERBODY PROTECTION
- Remove DRIVE BELT FOR ALTERNATOR
In so doing:
- Do not draw off air conditioning refrigerant.
- Do not detach refrigerant lines from A/C compressor.
- Do not remove A/C compressor; instead, remove from bracket only and place to one side.
Removal:
Release screw (1).
Release coolant expansion tank (2) and lay to one side.
Loosen screws (1) by a few turns until holder of air conditioning compressor (2) is loose.
Do not remove holder of air conditioning compressor (2).
Unlock connector (1) and remove.
Remove protective cap and release nut (2) underneath.
Disconnect positive battery cable (2) from alternator (3).
Release screws (1).
Release screw (2) and remove alternator.
Installation:
Install alternator and tighten screws (1).
Tighten screw (2).
Tightening torque: 12 31 1AZ .
Connect and lock the connector (1).
Connector (1) must snap audibly into place.
Install positive battery cable on alternator (3).
Tighten nut (2) and install protective cap.
Tightening torque: 12 42 1AZ .
Tighten screws (1) of air conditioning compressor holder (2).
Tightening torque: 12 31 2AZ .
Insert coolant expansion tank (2) into rubber mounts and tighten screw (1).
Tightening torque: 17 10 5AZ .
Required follow-up work:
- Refit air conditioning compressor.
- Install DRIVE BELT FOR ALTERNATOR
- Connect BATTERY EARTH LEAD
- Install UNDERBODY PROTECTION