Replacing Alt Belt on R12 Gs

Discussion in 'GS Boxers' started by Danl, May 18, 2006.

  1. Danl

    Danl Adventurer

    Joined:
    Aug 1, 2004
    Oddometer:
    18
    I am trying to replace the alternator belt on my '05 R 12 GS.
    It has 40,000 miles. I have searched the GS Forum for info
    and there is nothing on the new hexheads. I have the tank off and the alternator cover off and can see no way to loosen the alternator to adjust tension. Is the procedure to replace the belt different than the old GS's ?

    The old belt still looks good, maybe thinner than the new one.

    Also I replaced the plugs and noticed that the lower secondary plugs both looked blackened and not near as clean as the primary plugs. Is this normal ?

    Any advice would be appreciated

    Thanks

    Dan
    #1
  2. looney

    looney Been here awhile

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    Switzerland
    According to the Reprom CD you need a special tool (BMW #12 3 951) to slip on the belt. There is no provisions to loosen or otherwise adjust the alternator belt. To dismount they advise on using a blunt tool like a tire iron.

    HTH.
    #2
  3. Danl

    Danl Adventurer

    Joined:
    Aug 1, 2004
    Oddometer:
    18
    Looney

    Thanks very much for that reply.
    I was beginning to suspect that was the case.
    Strange no one else has posted anything about this.
    Seems like this would be a great item for the Hall of Wisdom
    for one of the Gurus. :D
    #3
  4. Waco

    Waco Renegade Sickle Hound

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    Impressive mileage rackage for a 2005 model. :thumb
    #4
  5. ghostryder

    ghostryder Long timer Supporter

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    Atlanta
    Well take some pics and post them. :D
    #5
  6. Poolside

    Poolside Syndicated

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    <BR>The alternator belt on the 1200 is a Conti Elast. It is an accessory drive belt with elastic Nylon belts.

    No alternator adjustment for the 1200. The alternator is a fixed mount. And the fancy BMW tool is not needed.

    Conti includes a throwaway sheet metal 'shoehorn' inside the retail packaging for the multi-rib belts for other vehicles.
    But the Elast belt length for the 1100/1150/1200 is a BMW OEM-only item and not sold to the public.

    The Conti Elast tool might be available by itself. But a strip of 16ga/.062" steel would be fine. Or do not use
    any 'shoehorn' tool to install the belt.

    The belt can be rolled over the crank sheave without tools, just like putting a slipped chain back on a bicycle.
    Easy as cake.

    Tech Tip: ALL THE ALTERNATOR BELTS NOW SOLD BY BMW ARE THIS CONTI ELAST BELT. What that means is
    that the 1100/1150 belt adjustment must be made a little tighter than the specs or it will usually slip and squeal.
    The Elast belt is 'adjusted' more by 'installed stretched length' than by tension.

    - Jim

    http://www.contitech.de/ct/contitech/themen/kommunikation/presse/050930_toolkit/en.html

    http://www.contitech.de/ct/contitech/themen/produkte/antriebsriemen/industrie/pr_krr_multirib_e.html

    [​IMG]

    [​IMG]

    [​IMG]<BR><BR>
    #6
  7. * SHAG *

    * SHAG * Unstable

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    #7
  8. GB

    GB . Administrator Super Moderator Super Supporter

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    Thanks Poolside! Very informative post.. :thumb
    #8
  9. Devil Dog

    Devil Dog Q-Tip With Ears

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    Great post indeed :nod
    Replacing it looks to be relatively simple.
    #9