Quote:
Originally Posted by dty3
For the original DIY: I just replaced this and I am not sure how the OP did it, but there was no way that I could it....here is a quick update on the steps I would add.
Add-in: I would release the belt tesioner (the middlle one) by loosening bolt directly above it. This will release the tension on the belt.
D) Next you need to remove 2 16mm bolts holding the alternator. Double check they are 16mm as I don't recall if they were 14mm or 16mm. One is right at the top very visible, the next one is hidden on the bottom of the alternator right around where the belt tensioner wheel is. Feel around with your finger, its there. Unscrew and pull out both bolts.
Add-in: Wiggle out the alternator prior to un-clipping the connector and removing the nut.
E) Next unclip the 2 pin electrical cable plugged to the back of the alternator.
F) Now its time to wiggle the alternator out. Yes, leave the B+ cable attached for the time being. There is just not enough room to get to it with the alternator in place.
G) So at this point the alternator should be out of its place, but still sitting at the bottom of the engine bay. Unscrew the B+ cable at the back. Its a 17mm bolt from what I recall.
H) The alternator is ready to be pulled out. Quite a bit of room to get it out, you will have no trouble.
This is as far as I am right now (taking a break between removal / reinstall) but reinstall looks opposite of removal. A couple of things I will do before reinstalling:
A) Give the B+ cable and its bolt a good sanding to ensure a good connection.
B) The "slots" that hold the alternator I will probably clean with WD40 and give a tiny tiny greesing just to make it slide in there easier (thats what she said!).
Add-in: Reinstall the alternator first, starting with the lower bolt, making sure the lower bolt passes thru the hole on the block. then screw in the upper bolt.
Add-in: Place the belt in the correct postion, put the screw back into the tensioner, once this is complete, remove the cap from the tensioner pulley with a screw driver, you should see a 14mm bolt. For this step I recommended getting someone to help you with this. I used a short extension attached to a 14mm socket, placed it on the 14mm bolt and rotated it clockwise, this will release the tension on the belt...this is where your helper comes in, while i was holding the pulley in position, your helper wiggled the belt into place (this was tedious), once in place release the tensioner and your done. now you just reinstall the fan, clip the hoses from the bottom and reassemble the air intake....
Final notes:
A) The torque on the B+ lead should be 19NM according to BMW.
B) The BMW TIS states that the underbody protection needs to be removed. I found there is absolutley no need to do this.
C) Will post if a new alternator fixes some of the issues mentioned at the start of this post.
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Thanks for taking the time to add the updates, they were really useful for me today getting the damn thing removed.