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Thread: ALPINA B7 Supercharger

  1. #1
    Join Date
    Dec 2007
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    '93 850Ci- Daily Driver

    ALPINA B7 Supercharger

    If your SC is leaking oil, it is quite easy to replace the seals (if the impeller does not have the "wobble" to it yet). Just received a seal kit from a fellow forum member on the "other" forum (nervnom3) and started the process last night.

    First step is to disassemble the blower housing, and everything went as planned, until I took out all of the bolts, this is where it came to a screeching halt!

    Okay people, I am going to vent a bit here because it seems that the previous owner of my B7 decided that a few tubes worth of PERRMATEX are far superior to replacing the O-rings that actually prevent the oil from leaking. It is all good until sometime in the very near future that sealant fails, and you have to disassemble everything that has been GLUED together!! It took a few hours just to get the two halves separated, another 3 hours to carefully remove all of the sealant and clean everything (use a very soft plastic scrapper to prevent damaging the sealing surfaces), and about 30 minutes to finish cleaning everything in preparation for reassembly.

    When you go to put everything back together, make sure there is a slight coating of motor oil on all of the rotating parts, and do not attach the SC serpentine belts until you have started the car and the oil has had a chance to circulate up into the Supercharger.

    Looking kind of worn, even from the outside:

    57921E17-FDE5-4576-B773-D1CC2E2A7C32.jpg

    That was all, carry on....
    Last edited by TxGR8White; 07-03-2018 at 11:19 PM.
    '93 850Ci - Mineralweiss Metallic
    ALPINA B7 -Alpinweiss III

    BMWCCA E31 Chapter President



    ...the price of cool ain't cheap!

  2. #2
    Join Date
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    Thanks for the post! How did you determine the seals needed replaced? I assume it was leaking?


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    MY SPEEDO ON THE 'BAHN!!! - @155!
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  3. #3
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    The quickest way to verify that oil consumption is from leaking SC seals, is to pull the rubber boot off the lower intercooler port, if oil runs out, you have leaking seals. Every single seal was hard as a rock on mine, but now everything is wonderful again. It really is not that difficult if you have some mechanical skills and work in an orderly fashion. Looks brand new now and will be installed first thing in the morning.
    02B9F392-0348-47E5-A6F1-41C976A50B6B.jpg C2E08546-39C8-436C-94F8-19D993783A22.jpg
    '93 850Ci - Mineralweiss Metallic
    ALPINA B7 -Alpinweiss III

    BMWCCA E31 Chapter President



    ...the price of cool ain't cheap!

  4. #4
    Join Date
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    '91 e31 M70 |'01 e38 M73
    Shes a work of art! Mine only has 50k and installed the lower temp thermostat. I hope that help with longevity, but given the RPMs and heat, its just a matter of time.

    Still my favorite BMW Ive ever owned though... although my 850 M73 swap is almost done! , so well see after that!


    Sent from my iPhone using Tapatalk
    MY SPEEDO ON THE 'BAHN!!! - @155!
    '07 e65|N62 - Alpina B7 - Black Sapphire|Black|Loaded
    '02 e46|M54 - Orient Blue|Beige|'Vert
    '00 e39|M52 - Anthrazit Metallic|Grey (Daughter's)
    '01 e38|M73 - Anthrazit Metallic|Schwarz|Shadow-Line
    '91 e31|M70 - Schwarz|Schwarz|M70

    '13 328i Auto - Black Sapphire|Coral Red|Sport Line|GONE
    '05 545i SMG - Jet Black|Black|Bamboo Anthracite|GONE
    '07 335i Auto - Montego Blue|Grey|GONE
    '05 545i SMG - (Euro Delivery 7/22/05)|Black Sapphire|Auburn|GONE
    '97 528i Auto - GONE

  5. #5
    Join Date
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    '93 850Ci- Daily Driver
    These seals really should be replaced as part of a preventative maintenance cycle every 60k-70k miles...
    '93 850Ci - Mineralweiss Metallic
    ALPINA B7 -Alpinweiss III

    BMWCCA E31 Chapter President



    ...the price of cool ain't cheap!

  6. #6
    Join Date
    Jun 2007
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    Atlanta, Ga
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    Alpina B7/4.6is/E34 540
    Looks fantastic. Were you seeing any external smoke?

    Does your B7 have the odd, laggy throttle that many seem so be plagued with? Just a characteristic of the beast? No B7 owners to can quiery local to me.

  7. #7
    Join Date
    Aug 2005
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    Vancouver Washington
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    2004 BMW 760 Li 1991ZR1
    Hi,

    At least you are touching your BMW & Not taking it to the dealer.

    Manfred E.........
    2004 760LI

  8. #8
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    '93 850Ci- Daily Driver
    Quote Originally Posted by imola38 View Post
    Looks fantastic. Were you seeing any external smoke?

    Does your B7 have the odd, laggy throttle that many seem so be plagued with? Just a characteristic of the beast? No B7 owners to can quiery local to me.
    Not really, when I first got the car, I was amazed at the snappy response. When I pulled the Supercharger and did the seals and general cleaning, I found 3 shop towels lodged in the intercooler intake that the last "mechanic" forgot, so I was completely thrilled again since the car is much quicker now.
    '93 850Ci - Mineralweiss Metallic
    ALPINA B7 -Alpinweiss III

    BMWCCA E31 Chapter President



    ...the price of cool ain't cheap!

  9. #9
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    Quote Originally Posted by Tomcat 74 View Post
    Hi,

    At least you are touching your BMW & Not taking it to the dealer.

    Manfred E.........
    2004 760LI
    I did take it by the dealer for a misfire diagnosis (didn't throw a code, but you could tell it wasn't 100%). Dealer came back with: 1."replace plugs and coils" (I put new plugs and coils in less than 1200 miles before). 2."Alternator bracket leaking" (I just finished that job a few weeks earlier - the oil was from a loose SC intake boot and the failed SC Seals), 3. "engine mount needs replacing" (okay, that was on my list to do, and I did just complete that), 4. "fix leaking SC oil supply line" (wasn't leaking - see #2 above), 5. "replace front lower control arms" (also on my to-do list - parts were already in the garage and was just completed last weekend).

    The quoted price for all the dealer "fixes" came to $12,015 after tax. I spent less than $350 for seals, arms and engine mounts.

    This is why I do my own work...
    Last edited by TxGR8White; 07-11-2018 at 11:33 AM.
    '93 850Ci - Mineralweiss Metallic
    ALPINA B7 -Alpinweiss III

    BMWCCA E31 Chapter President



    ...the price of cool ain't cheap!

  10. #10
    Join Date
    Mar 2019
    Location
    Budapest
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    My Cars
    BMW 545 supercharged
    Hello Guys,
    Need some help!!! I've a hughe oil leak on my BMW 545 with Alpina B5 supercharger. I've took the SC to a local guy who already has done several such sc-s. But after his work not only the oil was still leaking heavily, but the impeller became wobble and totally destroyed... He has removed the impeller, changed the seals inside and re-pressed. He told me, that he'll order a new impeller but I'm worried that the shaft itself was damaed during his repair...
    A good thing that I've a spare sc with the same issue. Could you guys point me to the guy who's making these repairs and seals seal kits?
    Thanks!
    Last edited by lfuli; 03-13-2019 at 05:05 PM. Reason: adding picture

  11. #11
    Join Date
    Jan 2012
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    Upstate South Carolina
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    1996 840Ci / 2007 B7
    Just posted an impeller solution in another thread. Much cheaper than a new SC. Let me know if you can't find it

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