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.
12 31 020 Removing and installing/replacing alternator (S62)
Switch off ignition.
Follow instructions for disconnecting and connecting battery. Refer to 12 00 ... Instructions for disconnecting and connecting battery .
Remove battery negative lead from battery and cover.
Remove alternator drive belt. Refer to 12 31 ... Replacing alternator belt pulley .
Remove cap from deflection roller.
Release screw (1) and remove deflection roller.
Release screws (2) on alternator.
Release screws (1).
Remove belt pulley (2) for power steering pump.
Disconnect plug connection (2) on alternator.
Release nut (1).
Installation:
Tightening torque, 12 31 1AZ. Refer to ENGINE ELECTRICAL SYSTEM - TIGHTENING TORQUES .
Remove battery positive lead from alternator.
Remove alternator.
Installation:
Press out bushes on engine support.
- Position of bushes after removal
- Assembly position
NO RELATED
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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.