Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Special Tools Required
Remove drive belt.
Illustrations show N42:
Procedure with special tool 12 7 121.
If fitted, remove protective cap from belt pulley.
Depending on the alternator version, hold down alternator axis with:
- Torx key
- Hold inner multi-wrench tool. Special tool 12 7 122 .
Release freewheel with special tool 12 7 121 and remove.
Installation:
Tightening torque, see 12 31 8AZ in ALTERNATOR WITH DRIVE AND MOUNT .
Procedure with special tool 12 7 123.
Depending on the alternator version, hold down alternator axis with:
- Torx key
- Hold inner multi-wrench tool. Special tool 12 7 122 .
Release freewheel with special tool 12 7 123 and a ring spanner and remove.
Installation:
Tightening torque, see 12 31 8AZ in ALTERNATOR WITH DRIVE AND MOUNT .
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.