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Thread: Nube error - Messed up on alternator belt tensioning

  1. #1
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    Nube error - Messed up on alternator belt tensioning

    I replaced the HES this past week on my 2010 R1100RS. I've had the bike a couple years and decided to put a new belt on as well since I wasn't sure when it had last been replaced (currently 68,000 miles). Read the Clymer and watched video to properly adjust the tension on the belt and got to it. UNFORTUNATELY, I didn't remember (or never realized) that the reverse on my torque wrench wasn't for measuring torque. I thought I'd learned my lessons about if it feels wrong, it probably is. Regardless, I torqued down way too hard and cracked the tensioner nut (Clymer calls it an idler I think). Does anyone know where I can find one of these?
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  2. #2
    Left Coast Rider
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    I'm going to assume you mean 2001 R1100RS. I believe the part # is 12 31 7 677 914.

    Available from your local BMW dealer or online from MAX BMW.

    https://shop.maxbmw.com/fiche/Diagra...6&rnd=07242017

    Diagram # 12_0767 in Section 12 - Engine Electrics.

  3. #3
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    Thanks for that. Will bookmark this page for future use. Off to get a reversible torque wrench...

  4. #4
    Quote Originally Posted by mhallman View Post
    Thanks for that. Will bookmark this page for future use. Off to get a reversible torque wrench...
    You do not need to overthink this. It is just a rubber drive belt. If you tighten the belt until you are able to twist it 90 degrees at the midpoint between the pulleys you will be just fine. That is not too tight. If it is too loose it will squeak on engine startup. If it were too tight the part that would be damaged is the front bearing in the alternator. I used this technique on my R1150R. That alternator was still alternating at 177,000 miles when I sold the bike. I use this technique on Voni's R1100RS and the alternator is still OK at 412,000 miles. The commutator is a bit grooved but the bearing is fine.
    Paul Glaves - "Big Bend", Texas U.S.A
    "The greatest challenge to any thinker is stating the problem in a way that will allow a solution." - Bertrand Russell
    http://web.bigbend.net/~glaves/

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    Thanks Paul. As someone trying to "learn-as-you-go", it's easy to overthink things. It's fun to work on the bike, but not when you end up fixing one thing but breaking another...

  6. #6
    Pepperfool GSAddict's Avatar
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    I have an extra, PM me.
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    Ufda happens..........

    Need your R11xx Hall sensor rewired? PM me.

  7. #7
    Registered User RIDERR1150GSADV's Avatar
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    I have used the method of belt tensioning that Paul mentioned for many years as well.
    This 90 degree tension check is actually spot on when you check it with a torque wrench..YMMV
    MOA # 108516
    Current ride 2018 R1200 GSA Triple Black
    Past rides '04 R1150RT, '05 K1200LT, '06 R1150GSA, ‘17 R1200RT

  8. #8
    Registered User dieselyoda's Avatar
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    They do make belt tension gauges that are easy to use. Universal application.
    1997 R1100RT, 1981 KZ 440 LTD, R80RT, R90/6 sidecar, K1100RS,1983 K100RS (Cafe now)

    “The major civilizing force in the world is not religion, it is sex.”

  9. #9
    Quote Originally Posted by dieselyoda View Post
    They do make belt tension gauges that are easy to use. Universal application.
    If you know what the tension spec is supposed to be? Or is it a universal value?
    Paul Glaves - "Big Bend", Texas U.S.A
    "The greatest challenge to any thinker is stating the problem in a way that will allow a solution." - Bertrand Russell
    http://web.bigbend.net/~glaves/

  10. #10
    Pepperfool GSAddict's Avatar
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    Or you can torque to spec from the front with the BMW special tool
    https://shop.maxbmw.com/fiche/PartsD...T_12%203%20551
    per service bulletin 12 001 02

    or make your own.
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    Ufda happens..........

    Need your R11xx Hall sensor rewired? PM me.

  11. #11
    Registered User dieselyoda's Avatar
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    Quote Originally Posted by PGlaves View Post
    If you know what the tension spec is supposed to be? Or is it a universal value?
    There are a bunch of them out there based on the belt only. I recently saw Gates used a piece of tape. You applied the tape to the belt. You tightened the belt and when the tape broke, that was the perfect tension for the belt.
    1997 R1100RT, 1981 KZ 440 LTD, R80RT, R90/6 sidecar, K1100RS,1983 K100RS (Cafe now)

    “The major civilizing force in the world is not religion, it is sex.”

  12. #12
    MOA #24991 Pauls1150's Avatar
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    From the shop manual, it's 8 Nm.

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