BMW E46 Alternator replacement guide, How To.
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  1. #1
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    BMW E46 Alternator replacement guide, How To.

    BMW E46 Alternator removal guide. How to change your E46 alternator.

    You follow this guide at your own risk, the information here is given freely and it is up to the user how to interpret and use that information. We accept no responsibility for any damage or injury to you, your vehicle or equipment if you choose to use the information offered to you.

    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.
    Alternator removed.


    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.
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  2. The Following 5 Users Say Thank You to Ronnie For This Useful Post:

    Ferret (31-05-2012),mjojom (01-06-2012),NealP (01-06-2012),Stal1878 (01-06-2012),StK (01-06-2012)

  3. #2
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    Very nice guide Roonie


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  4. The Following User Says Thank You to Ferret For This Useful Post:

    Ronnie (31-05-2012)

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    Nice one mate .

  6. #4
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    Automatic or Manual

    Thanks for the great guide. Is this an automatic or a manual transmission. I have a 2003 e46 320d automatic and just want to know if it will be the same?
    Cheers

  7. #5
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    Quote Originally Posted by cormicar View Post
    Thanks for the great guide. Is this an automatic or a manual transmission. I have a 2003 e46 320d automatic and just want to know if it will be the same?
    Cheers
    Transmission doesn't matter on the 4 cylinder M43 engine, doesn't make any difference to the job.

    As your car is a 320d though the alternator will be not be as simple to remove I'm afraid, although the position of it is similar. You will have a few more items that will need removing to get the alternator out.
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  8. #6
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    Quote Originally Posted by Ronnie View Post
    Transmission doesn't matter on the 4 cylinder M43 engine, doesn't make any difference to the job.

    As your car is a 320d though the alternator will be not be as simple to remove I'm afraid, although the position of it is similar. You will have a few more items that will need removing to get the alternator out.
    Thanks Ronnie.
    Do you know where I can find a good guide to remove the alternator on my car. I think I have to remove the fan and shroud to get at my alternator.

  9. #7
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    You will need to remove the fan and the shroud yes,

    I will have a look for a guide later.
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