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7 Series - E65 / E66 (2002 - 2008)
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  #1  
Old 10-04-2012, 06:39 PM
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wjjklj wjjklj is offline
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Location: Louisville, Kentucky USA
 
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Mein Auto: 2009 750i
Replaced my Alternator today

Well my car has been freaking out with dynamic drive fault, transmission failsafe, emissions errors and others. Codes show back to under voltage and over voltage. I read through tons of posts, replaced the power module and the integrated supply module to no avail. Found a post pointing me to the alternator.

So today I dove into that repair with help from this site. I found a good write up by AMAR67 on the 5 series forum and he had the same engine. I continue to be amazed by many things: 1) How helpful this forum is, 2) How expensive BMW service is, and 3) How many prices are out there online for the same parts. I found a great deal on a 180 amp new Valeo Unit (same brand as my original alternator) for $255.00. I used coupon code specE30 to save 5% and to get free shipping from BMAparts.com. I did not remove the radiator as was mentioned to do but did remove the fan shroud. Plenty of room after that came out. I only had one problem...I broke the belt tensioner so had to order that for $40.00. Still not sure how I did that! I ordered new belts also.

I had a oil leak that concerned me that was on my passenger side underneath the vacuum pump. Again, with the help of this site I found that it is a common leak and that you can replace both seals on the vacuum pump instead of replacing the entire pump. I ordered the seals a few days back and went ahead and fixed that while I had plenty of room to work. The seal kit was ordered from BMP Design for $28.00 which included shipping. The Part number is 305162 and is probably the same up to 2008 models.

Since I have gotten so much confidence from detailed instructions on this site and since I have the fan shroud out and engine covers, I decided to order a new water pump, thermostat, vacuum hoses, and all coolant hoses. My car has 86,000 miles on it but is 9 years old now and I know this service is generally expected around 100K. I will have about $750 in parts and figure that to do all of this would have cost me around $4000+ at the dealer.

I appreciate everyone that has done write ups and posted information. This forum saves me so much money. Thanks.
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  #2  
Old 10-04-2012, 07:27 PM
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MakaveliFaison MakaveliFaison is offline
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Mein Auto: Bmw E64/5, Maserati GT
Nice job. Was vacuum pump job bad?. I need to do that myself also
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Old 10-04-2012, 07:58 PM
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wjjklj wjjklj is offline
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Quote:
Originally Posted by MakaveliFaison View Post
Nice job. Was vacuum pump job bad?. I need to do that myself also
No it was a pretty easy job. You disconnect the vacuum hose on top of the pump. There are a couple of hoses clamped the the front of the pump that you just remove a nut on each one. The nut is 10mm. You then remove 3 star bolts that hold the pump onto the engine. After removing those you simply pull the pump off. You will see on the back of the pump where it has been leaking. There is a small o ring on the back of the pump that has probably stretched. Once you have the pump off you remove 5 star screws with I think a T-25 bit. There is another o-ring inside the pump. This took me about an hour to fix. The hardest part is putting the pump back on. It has a key on the back which has to align with a slot on the engine. I had to turn the engine with a 1 1/4 socket to make the slot line up vertically to get the key to fit in the slot. Not a hard fix though.
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Old 10-05-2012, 03:09 AM
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Lastcombo Lastcombo is offline
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Mein Auto: BMW745I E65 ,BMW318 IS 94
Thanks bro nice write up
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Old 10-05-2012, 07:35 AM
stevenathas stevenathas is offline
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  #6  
Old 10-08-2012, 06:04 PM
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wjjklj wjjklj is offline
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Mein Auto: 2009 750i
Waiting on the tensioner pulley I broke along with a new Graf water pump and hoses. Car is on ramps....
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  #7  
Old 10-09-2012, 09:48 AM
theckj theckj is offline
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While you are at it, may as well replace the oil pressure sensor as well. It is right below the vacuum pump and it has a tendency to leak also. I had the exact same leak in my vacuum pump and fixed it this weekend. The oil pressure switch was $16.37 from the stealer. Can get it for around $10 online. I also replaced one of the 3m vacuum hoses because it was so brittle. Agree how much this forum saves me $$$!

Q. for WJJKJL: did you replace the alternator flange seal at the same time? My timing cover gaskets are leaking (upper and lower) as well as alternator flange gasket. I think I can get to the timing covers Ok, but many forums say that you have to actually lift the engine to get to the alternator.
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Old 10-09-2012, 03:21 PM
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wjjklj wjjklj is offline
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My alternator was air cooled and not the water cooled one found in earlier e65's so I did not have to replace any flange when installing the alternator. I just received my Graf water pump which has the metal impeller as opposed to the plastic one that the original has. I am getting started after dinner. I will certainly check out the oil pressure sensor...thanks!
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Old 10-09-2012, 05:09 PM
theckj theckj is offline
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Location: Atlanta
 
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Mein Auto: E65
Mine is a 2006. Not sure of the type of alternator. I'm going to tackle upper timing cover gaskets, valve cover gaskets and new plus all at the same time. When it's all apart I will check out the alternator.

As for the oil pressure sensor, all you need is a 24mm deep socket to take it out after removing the clip.
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