BMW E46 Alternator removal guide. How to change your E46 alternator.
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This guide will show you how to replace your E46 alternator.
First of all remove the Cruise control actuator from it's fixings and move it to the side with the cable still attached. Tools, a ratchet, extension and 10mm socket.
Then the clips that hold the air filter feed on. Tools, Pliers.
Slacken the "Jubilee clip" that holds the induction pipe to the Mass Air flow sensor(MAF) and disconnect the MAF plug.
Tools, Ratchet and 7mm socket.
Then remove the airbox.
Next remove the 10mm nuts that hold the Power Steering reservoir in place, move the reservoir away, then release the tension on the serpentine belt(turning anti clockwise) using a spanner on the tensioner pulley nut. Tools, 15mm spanner.
Disconnect the engine power cable from the engine power point on the drivers side bulkhead. Tools, 19mm spanner or a ratchet with 19mm socket.
Slacken and remove the top alternator bolt and lower alternator bolt. Tools, ratchet and 16mm socket.
Pull the alternator away from it's fixing, sometimes a pry bar comes in handy as they can be stubborn. Once the alternator is free remove the alternator main power lead (13mm nut) and disconnect the black plug.
Now you can proceed with fitting your new alternator, fit and tighten up your alternator and reconnect the plug and power lead. Tools, Ratchet, extension and 16mm socket. Torque(M10 bolts). 50 Newton Metres.
As I was removing the alternator to replace the oil filter housing gasket the pictures end here, but everything else is a reversal of removal. Fit your serpentine belt(alternator belt), PAS reservoir, air filter box and ducting and cruise control motor then lastly reconnect your power cable back to the engine jump point and you are good to go.