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Thread: 78 r80/7 drive shaft bolts wrench

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  1. #1
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    78 r80/7 drive shaft bolts wrench

    Hi a few years ago I rehabbed a 86 r80, I am now doing a 78, when I did the drive shaft bolts last time I made the wrench and torqued them down , now I cant remember what to set the torque wrench to with the added length of the little wrench ala snowbaulm.Anyone know?
    Brian

    86 k100rt, 78 r80/7

  2. #2
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    Quote Originally Posted by yankeeone View Post
    Hi a few years ago I rehabbed a 86 r80, I am now doing a 78, when I did the drive shaft bolts last time I made the wrench and torqued them down , now I cant remember what to set the torque wrench to with the added length of the little wrench ala snowbaulm.Anyone know?
    You need a 10mm 12pt wrench on one end that will fit your torque wrench on the other end. Attach the wrench so it is at a 90 degree angle to the handle of the torque wrench, thus minimally lengthioning the effective torque arm. Then use the specified torque for the bolts.
    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://www.bigbend.net/users/glaves

  3. #3
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    Thank you
    Brian

    86 k100rt, 78 r80/7

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    I think Snowbum has a section on special tools.

    Also, check this: http://www.northwoodsairheads.com/Tools.html

    About half way down the page, there is a pic of what you want to buy or make.
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    "The difference between death and taxes is that death doesn't change every time congress meets." - Will Rogers

  5. #5
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    Quote Originally Posted by jimmylee View Post
    I think Snowbum has a section on special tools.

    Also, check this: http://www.northwoodsairheads.com/Tools.html

    About half way down the page, there is a pic of what you want to buy or make.
    *************************
    If you don't have one of the special tools, you can make one; buy something that works......or, use the 10/12 mm dual box-end wrench in the standard BMW tool kit, and give the wrench what we call a 'good grunt'. That Good Grunt works fine with the stock length 10mm/12mm dual box end wrench.
    Some have used that wrench and a 3/8" square drive torque wrench, calculating the lowering of the setting due to the wrench length. I have that calculation method in my torque wrench articles.
    The torque you want on the bolts is 29 footpounds, if using a torque measurement. If your bolts came with split lockwashers, remove them, do NOT! reuse them, do NOT replace them. Get the new SHORTER bolts. HEED MY WORDS!!
    Put ONE small drop of Loctite BLUE on the clean threads before torquing.
    The original factory tool is pictured in my tools article. It is nothing more than a square drive of a socket with an added slit, to which a 10 mm offset box portion (they cut the other end off!) was brazed or welded (have seen them pressed too) into the square drive slit.
    Three photos of the factory tool are located, and described, etc., in section 4 of my tools article...that means it is about 2/3 of the way down the tools article page.
    The article is number 65 on my website.
    http://bmwmotorcycletech.info/tools.htm
    snowbum

  6. #6
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    They are called torque wrench adapters and are widely available from the usual tool suppliers.

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