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Faults, Fixes and DIY Please share your experience and knowledge with other members by contributing your own DIY, or by helping another member find the elusive fix!


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Old Sat, Feb-15-2014, 12:04:23 AM   #71
///NNM
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Default Re: DIY: 120A alternator on e46 m3

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Originally Posted by silviaks View Post
OMG i just did this ... fitting the new one back is a PAIN!!! Took me 2 hrs fit it, another 30 mins to align the 2 bolts!!! I hope I dont have to do this again soon.
Geezus ! All you have to do is knock the lower nut out 1mm. And it will slide rigjt in. Instructions are on turnermotorsports under underdrive pulleys page.

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Old Tue, Feb-25-2014, 06:57:18 PM   #72
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Default Re: DIY: 120A alternator on e46 m3

So ive got my new alternator installed. there was a warning to make sure the battery was fully charged before hooking it back up. I really cant find much on the subject. My battery is currently up to 35% after sitting for a few weeks and charging for a few hours and hasnt moved from 35%. Id really like to just finish the install but is it better to wait for a full charge?
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Old Wed, Jun-04-2014, 06:00:55 AM   #73
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Default Re: DIY: 120A alternator on e46 m3

Just wanted to say thanks to everyone. Tensioner on my 06 cab was an 8mm hex, otherwise everything was as described. This is another good reference thread.

Valeo out at 47k, Bosch reman from AutohauzAZ in. Cross your fingers I don't have to do this again any time soon.

PS don't do this when it is 108F.

Last edited by ///MJK; Wed, Jun-04-2014 at 07:52:10 AM. Reason: poor grammar
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Old Thu, Feb-19-2015, 05:01:23 PM   #74
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Default Re: DIY: 120A alternator on e46 m3

I'm attempting this today. Any help is appreciated!
How do you get the top bolt out without taking off the radiator fan?
Right now the bolt is in between fan blades and my wrench will no longer go around the end of it.

Once I get this out any advice for getting it back in?

Thanks!!!
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Old Thu, Feb-19-2015, 05:16:34 PM   #75
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Default Re: DIY: 120A alternator on e46 m3

Nevermind.

If you haven't let tension off the belt push down on the pulley and top bolt will spin more freely and come right out.
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Old Wed, Apr-22-2015, 05:12:15 AM   #76
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Default Re: DIY: 120A alternator on e46 m3

I really appreciate the DIY write up and pics.. I have never done any kind of repair work in my cars before. I was a bit scared too. I called up few places and they would charge me 650 to replace alternator. I looked up this forum and read all the comments about the issues few folks faced. I decided to take a chance and do it myself.
So, first I made sure my battery was fully charged before disconnecting.
I used WD-40 on the contact points and let it sit for few mins and so the alternator came off with out any issues.
I made sure the alternator I bought from Napa matched exactly with my old Valeo.
I did use WD-40 while installing the new alternator which made it easier.
No issues.. I didn't have to remove the oil lines or the radiator fan, just the air filter. Put everything back on and started - no problems. Battery light never came on.. went for a ride!..
Thank you very much!!.. I saved 450 bucks!.
Ram.
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Old Sat, Jul-28-2018, 06:00:06 AM   #77
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Default Re: DIY: 120A alternator on e46 m3

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Originally Posted by ///NNM View Post
Geezus ! All you have to do is knock the lower nut out 1mm. And it will slide right in. Instructions are on turnermotorsports under underdrive pulleys page.

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This may seem like a dumb question but can someone explain how to specifically slide the nut? Others have mentioned sliding the nut out or knocking the nut out but how do you exactly do this?. I replaced my alternator last year and I struggled for hours to get the bolts lined up but sounds like there is a trick here to get it done quickly. Would love to get this fitted back in in 5 min.

In my attached pic, do I try slide the nut towards me or away from me? And how do you slide the nut since it seems like it won't budget at all.
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Discussing DIY: 120A alternator on e46 m3 in the Faults, Fixes and DIY Forum - Please share your experience and knowledge with other members by contributing your own DIY, or by helping another member find the elusive fix! at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)