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-   -   2003 745i NEED HELP WITH ALTERNATOR REPLACEMENT (http://www.bimmerfest.com/forums/showthread.php?t=636686)

stevenathas 08-01-2012 01:12 PM

2003 745i NEED HELP WITH ALTERNATOR REPLACEMENT
 
Hey Everyone,

Soooo, my alternator seized up over this weekend. I've seen a few write ups about replacing the gasket for the alternator mount, but I haven't seen anything detailed regarding replacement of the actual alternator. I already bought the replacement alternator, and im pretty much ready to do the work but my main concern is removing things that really dont need to be removed. I reached behind the alternator and was able to find the 2 bolts that mount the pulley towards the bottom half of the alternator and it really appears that, that portion may be the only challenging piece.

Now knowing that my repair knowledge when concerning this car is fairly limited, I am very ready for the posibility that I am sadly mistaken lol.

Can anyone give me some advice on this repair?

What are the tools I'm going to need (for the bolts on the back of the alternator)?

Socket wrench? extension pieces? wrench? mm's?
Any special instructions?

What am I going to need to remove?(heard stablizer bar needs to be dropped and suported)

How long is this going to take?

Any write ups that may have some photos?

Anyone who can help or provide any type of insight will be greatly appreciated. Sad moment in my life right now lol. basically been riding my bike everyday to work and being on a cold freeway at 7am in a collared shirt slapping against your neck is no fun lol.

Expo BMW 08-01-2012 05:16 PM

Woodland hills is too far for me. I would like to give you a hand so I can learn myself. I'm starting to hear noise coming from my alternator bearings so by the looks of it I'm going to take on this job probably before the end of the year :supdude:

Rookie2008 08-01-2012 05:39 PM

Here is the link on how to replace alternator. Good Luck. http://tis.spaghetticoder.org/s/view.pl?1/07/45/83

Expo BMW 08-01-2012 05:45 PM

Great info Rookie! First step is "remove radiator" :yikes:

Rookie2008 08-01-2012 05:47 PM

Quote:

Originally Posted by Expo BMW (Post 6985544)
Great info Rookie! First step is "remove radiator" :yikes:

:rofl: I saw that also. Sorry I don't think you really have to remove it :eek::dunno::)

stevenathas 08-01-2012 06:19 PM

Yeah Expo, seems like its a do-able job. Good luck on your repair! Figured I can take a weekend to do a job that would ordinarily cost 1300 bucks.
Thanks for the link Rookie!! I really appreciate it. Hopefully the bolts behind the alternator won't be real difficult to get to. Gonna be taking a lot of pictures so hopefully I'll have a decent write up for this site!!

Rookie2008 08-01-2012 06:22 PM

No Problem.

k7780446 08-01-2012 07:10 PM

Would you use these directions for replacing the gasket that causes the oil leak behind the alternator as well?

sirstopher 08-01-2012 07:45 PM

Guys at the shop didnt remove the radiator but it was up on a rack.

Expo BMW 08-01-2012 07:45 PM

Doing the alternator bracket gasket is a bigger job but this will get you started.

stevenathas 08-01-2012 08:42 PM

Hey K77, KeifR and Wilson009 hav a write up about replacing that gasket. If you look up KeifR's flikr site, there are a lot of pictures that were taken through the process. Good luck!!

stevenathas 08-10-2012 11:09 AM

Hey everyone,

Alright so this is where i'm at, at this point. Alternator is out and the replacement I bought was an aircooled alternator as per my cars factory specs (that's what BMW said after looking up my VIN & ReaOEM). I pull out the alternator and it's a water cooled alternator!!?? Now, I'm really concerned. Are the parts interchangable like that? Does this mean I'm going to need to remove more things?? looks like the mounting points are completely off on the aircooled... Is this normal? Any help is much appreciated. Thanks again

alpinaman24 08-10-2012 11:27 AM

if your still having trouble my shops in woodland hills we can do it for you

stevenathas 08-10-2012 11:43 AM

Quote:

Originally Posted by alpinaman24 (Post 7002521)
if your still having trouble my shops in woodland hills we can do it for you

I'm sure since i've gotten this far, I can get the rest done. I really appreciate the offer though. I'm just confused as to why everybody says that my cars alternator should be air cooled and it turns out that it's water cooled. Could my engine have been swapped, did they completely botch the first replacement and put on the wrong one? The mounts are completely different for what it looks like... I'm in definite need of some clarification as to why the discrepency is there..

sirstopher 08-10-2012 12:43 PM

You have the wrong alternator.

You need the water cooled one

The one you have will NOT work!

stevenathas 08-10-2012 12:52 PM

Quote:

Originally Posted by sirstopher (Post 7002675)
You have the wrong alternator.

You need the water cooled one

The one you have will NOT work!

LOL fantastic:dunno: !! well back to the automotive stores for a replacement then. worst part about it is that I need put everything back together now only to have to remove it all again next week. Thank you for everyones input and help. F@#K!!!!:mad:

sirstopher 08-10-2012 01:30 PM

Take your old alternator with you to make Dan sure you get the correct one while your at the parts counter.

02QTR28 08-10-2012 03:48 PM

Man u dont have a spare car? if not that sucks! putting back together & taking back apart will most definitely make an expert in swapping!

bayerisheteknik 08-10-2012 04:29 PM

Quote:

Originally Posted by stevenathas (Post 7002701)
LOL fantastic:dunno: !! well back to the automotive stores for a replacement then. worst part about it is that I need put everything back together now only to have to remove it all again next week. Thank you for everyones input and help. F@#K!!!!:mad:

which one you need? i have 150amp water cooled alternator in excellent condition for sale....also have 180 amp one that is seized up needs rebuilt...both are bosh oem bmw

stevenathas 08-10-2012 04:48 PM

Well my next step us to repair the one I have. I really don't want to spend 700 bucks on another alternator so I'm basically on the hunt for the appropriate bearings needed as BMW no longer makes it lol (how fitting). So if anyone knows where they have them or can point me in the right direction, I would greatly appreciate it. I do have another vehicle but it's a motorcycle and luckily it's been warm here in southern California. But I'd really like to be comfortable out on the road and my AC suits me just fine lol

02QTR28 08-11-2012 05:54 AM

Honestly brotha all alternators for our cars are rebuilds no matter where you go! Here was my logic on buying mine when i needed to replace mine! 1. dealer sold them but it is a rebuild for $1,000-$1,200 with 2 year warranty 2. Autozone sold them as well rebuilds with lifetime warranty for $500 & change with core! If you weigh out options your better off with autozones! in my opinion anyways & if your doing job yourself!!!:thumbup::thumbup::thumbup:

bayerisheteknik 08-11-2012 07:42 AM

Quote:

Originally Posted by 02QTR28 (Post 7003909)
Honestly brotha all alternators for our cars are rebuilds no matter where you go! Here was my logic on buying mine when i needed to replace mine! 1. dealer sold them but it is a rebuild for $1,000-$1,200 with 2 year warranty 2. Autozone sold them as well rebuilds with lifetime warranty for $500 & change with core! If you weigh out options your better off with autozones! in my opinion anyways & if your doing job yourself!!!:thumbup::thumbup::thumbup:

i was going to get one from autozone my self but after reading few threads about it not being bosh but duralast brand i changed my mind....one guy had to change the alternator 3 times until he got a good one from autozone...other guy mentioned the ones from autozone have parts from china and since they are rebuilt they dont get rebuilt like bosh oem bmw ones....i think lifetime warranty is there because of lower quality components used in the rebuilt and they don't replace every component like lets say if you buy a bosh one....
only good thing is i only had to pay 700 for brand new oem bosh from bmw dealer instead of 1130+tax because the guy ordered air cooled one and my girlfriend picked it up brought it home and i was like what the hell is this???? air cooled one go for 680 from dealer...installed it last week and car runs like champ... i got the 180amp one but i still don't get why are they so expensive since they changed to air cooled ones in 2004 if iam correct??

02QTR28 08-11-2012 08:20 AM

Yeah I understand where ya coming from as far as reliability ! First one I got crapped out & I knew it would! It looked cheaply ! Took it back & got a Bosch rebuild! & everything is A ok a year & a half installed now! & now a days everything is made in china!!! It may say Bosch oem but more likely it's made in china! Looks at our car BMW's name alone stands beyond most! But look at the problems they come with!!!

sirstopher 08-11-2012 08:41 AM

Quote:

Originally Posted by bayerisheteknik (Post 7004049)

700 for brand new oem bosh from bmw dealer instead of 1130+tax

.

You will never find a brand new one, they are not made anymore. ALL alternators that are the water cooled 180 amp are REBUILT.

I got my alternator that is bosch from my independent mechanic. It was 700 bucks and does have a warranty for two years. I have been exactly right where you are right now. I also took my alt to multiple shops to have it rebuilt, no one would touch it? People here in Oklahoma that work on this kind of stuff are not the sharpest tool in the shed, and when you try and tell them you have a liquid cooled alternator they just stat laughing-

I thought I read that there is a place in California that will take your core and rebuild it for 300 bucks? This topic has been covered.

stevenathas 10-04-2012 12:50 PM

Alright lol... So I know this is a bit late but I finally finished the alternator replacement for my car. Even though I was pretty broke the last few paychecks I pony'd up and mad a small sacrifice to not have to see my car sitting there collecting dust. Installed the alternator. I was pretty rough in the begining with regards to actually getting to the bolts I needed to get to, and after about 3 hours of searching for enough light, removing bolts in the most odd places, many drops of oil and collant to the face, and 2 trips to pep boys for the right tools, the alternator was out and ready to be rebuilt.

I took it to Valley Alternators in Winnetka, off of Saticoy and Winnetka in the San Fernando Valley. The owner was really curteous and turn a bad situation into somthing awesome. He was able to rebuild my 180AMP Bosch alternator for 300 minus giving me 50 bucks for the alternator that I bought previous (air cooled, and wrong). I spent more on it, but I was happy to get rid of it because I had no use for it.

For anyone who says that the fan shrowd doesn't need to be removed, I have no idea how you would get that alternator out of there without removing it, it was a tight fit even with it off. I didnt completely remove the active stabilizer bar, I just removed the left side and tied it up to one of the other componants just to make sure it didnt go down too far. Just like everyone says, the 2 bolts attached to the bottom of the alterator that hod the pulley place was the absolute worst part of this job. ratchet wrenches helped a lot, for the most part once they were loosened, I did it with my fingers so it was fairly simple (if you got fat fingers there's no way though).

Felt good being able to save like a 1600 off what the dealer quoted me and even 1k less than what the indy shop quoted me. I wont say any names because they've taken care of me in the past and maybe they just don't specialize in that type of repair and quoted me a price that they were comfortable with.

Either way, job done. It was an easy fix now that I look back on it. Thinking I'm ready to tackle some more challenging fixes at this point. maybe once I get a little more money i'll take care of the left side timing cover gasket (have a small seap).

Couldn't have done any of that stuff without all your help. It's awesome that everyone helps eachother on here and lends their expert advice. I am forever thankfull because 1600 dollars is something I didnt have.

Thanks again to everyone.


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