/5 airhead torque value

Discussion in 'Airheads' started by oldroadie, Nov 23, 2011.

  1. oldroadie

    oldroadie Two wheel addict

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    Okay, it's fall/winter project bike time and I'm already battling Clymer who seem to have hidden the torque value quite cleverly. I know the 1972 R75/5 had issues with folks over tightening these bolts, I've got my inch pounds wrench at the ready...who knows the number and will you post it, please?

    edit: forgot to specify - Torque value for the oil pan bolts, please.

    [​IMG]
    #1
  2. pommie john

    pommie john Long timer

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    We need to know which bolts you're talking about.
    #2
  3. oldroadie

    oldroadie Two wheel addict

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    Yes, I suppose that would help. Torque value for the oil pan bolts, please.
    #3
  4. Houseoffubar

    Houseoffubar HoFmetalworks.com

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    I would go by feel, if it were my bike.
    #4
  5. Horsehockey

    Horsehockey A GPS? Huh?

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    For the oil pan bolts, it's something like 6 or 7 foot pounds. In other words, just snug. A dry oil pan is a function of how clean you prepare the metal surfaces (use acetone to get it all....no residual anything), and tighten the 14 bolts in a crosswise star pattern beginning in the middle of the two long sides. Tighten sequentially, not all at once on a single bolt.

    For torque specs:

    http://bmwmotorcycletech.info/torquevalues.htm
    #5
  6. pommie john

    pommie john Long timer

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    #6
  7. Horsehockey

    Horsehockey A GPS? Huh?

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    Right you are Pommie. Here's Snowbum's work on the subject:

    Oil pan mounting bolts: book values 6.5-8 (some books show to 8.5)foot-pounds.......I suggest less, perhaps 5.5-6, carefully tighten in a staggered
    cross-pattern, starting at the center ones, and do it very evenly. NO GOO! Put the lettered side UP. There is a heat-activated glue on these.
    The old cork gaskets are NLA. I do these bolts BY HAND, not torque wrench. YOU may want a torque wrench MOST torque wrenches
    of the type that have a range of maybe 5 to 75 foot-pounds, can NOT be used for this, as their accuracy is NOT good, nor is the FEEL for the click.
    If you plan to use a torque wrench, use an INCH-pound wrench. Multiplying my 5.5-6 foot-pounds by 12, you can see that I would be
    recommending 66 to 72 INCH-pounds.
    #7
  8. Bill Harris

    Bill Harris Confirmed Curmudgeon

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    Snug but not too snug. Get a 0-200 inch-lb torque wrench and use 70-75 inch-lbs. On aluminum, your best friend is a 3" palm ratchet, 3/8 drive.

    Pan bolts, run through the pattern, snug them and run it for a week and re-snug. The gasket tends to "settle".
    #8
  9. wmax351

    wmax351 Been here awhile

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    I did them via a screwdriver type socket to hand tight, then snugged them with my hand around the middle of a 3 inch flex ratchet. Less is better. A couple stripped out anyhow (when they are ready to go, they go with the slightest torque). Loosen, then retighten as you are taking the pan off: that way you strip the threads which are shot before you put the pan back on. Helicoil is your friend.
    #9
  10. oldroadie

    oldroadie Two wheel addict

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    Thanks everybody. I knew I had read that number somewhere and when I didn't find it in the Clymer I just stopped working and walked away; too many months of prep reading and I hadn't bookmarked the proper spot. It seems that I read and absorbed Snowbum's procedure and my tiny brain just didn't remember...
    #10
  11. lkchris

    lkchris Albuquerque

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    Good place to use Loctite
    #11
  12. disston

    disston ShadeTreeExpert

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    I don't use a torque wrench on these and I also use Locktight, Blue, most times. However on occasion when I could not find the tube of Locktight it worked fine, they held, dry. Still did not use a torque wrench.
    #12