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Engine to frame mounting bolt torque

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  • #1

    Engine to frame mounting bolt torque

    In looking over the manual it seems to say 10mm bolts torque to 48-49 ft-lbs, and 12mm to 72-73 ft lbs. One, that is A LOT of torque for bolts that size, and two, all he engine mounting hardware is 12 and 14 mm.

    So, am I reading it wrong? Are they referring to thread size? are these correct numbers?
    Life is what happens while your planning everything else!

    When your work speaks for itself, don't interrupt.

    81 XS1100 Special - Humpty Dumpty
    80 XS1100 Special - Project Resurrection


    Previously owned
    93 GSX600F
    80 XS1100 Special - Ruby
    81 XS1100 Special
    81 CB750 C
    80 CB750 C
    78 XS750
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  • #2
    Mounting Bracket Bolts: 48 ft.-lb.

    Front and Rear through bolts: 72 ft.-lb.

    I replaced my bracket bolts with grade 8 'cause one snapped when torqueing.
    1980 XS1100G "Dolly G" Full Dresser (with a coat of many colors )
    1979 XS1100SF (stock-euro mods planned)
    1984 XV700L Virago (to be hot-modded)
    1983 XJ750MK Midnight Maxim (semi-restored DD)
    1977 XS650D ( patiently awaiting resto)

    Sometimes it takes a whole tank of gas before you can think straight.

    Comment

    • #3
      From the UK site.....

      http://www.benefiscal.co.uk/forum/index.php?topic=48.0
      Greg

      Everybody is a genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is stupid.”

      ― Albert Einstein

      80 SG Ol' Okie;79 engine & carbs w/pods, 45 pilots, 140 mains, Custom Mac 4 into 2 exhaust, ACCT,XS850 final drive,110/90/19 front tire,TKat fork brace, XS750 140 MPH speedometer, Vetter IV fairing, aftermarket hard bags and trunk, LG high back seat, XJ rear shocks.

      The list changes.

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      • #4
        Yah Greg, that set of specs makes more sense than the Clymers where I got my info.

        Been Clymered Again no wonder I snapped the braket bolt.
        1980 XS1100G "Dolly G" Full Dresser (with a coat of many colors )
        1979 XS1100SF (stock-euro mods planned)
        1984 XV700L Virago (to be hot-modded)
        1983 XJ750MK Midnight Maxim (semi-restored DD)
        1977 XS650D ( patiently awaiting resto)

        Sometimes it takes a whole tank of gas before you can think straight.

        Comment

        • #5
          Originally posted by Schming View Post
          Yah Greg, that set of specs makes more sense than the Clymers where I got my info.

          Been Clymered Again no wonder I snapped the braket bolt.
          Unless it's milled engine components holding back gas, oil, or pressure I almost never take a torque wrench to this sort of stuff. I've snapped more bolts following directions than I have just using best judgement.
          78 E - 2to1 exhaust, dynatek coils, special headlight [SOLD!]
          79 F - gas tank refurb, headgasket change, straight pipes, late model carbs, virago lowering shocks, special headlight and gauges, TC fuse block, GSXR-1100 carbs (WIP)


          "May my tires not fail me, nor my engine grow cold"

          Comment

          • #6
            I was thinking the same thing Gabe. I guess the only thing I use one on is the head, and if ever, the wheels.
            1979 XS1100F
            2H9 Mod, Truck-Lite LED Headlight, TECHNA-FIT S/S Brake Lines, Rear Air Shocks, TKAT Fork Brace, Dyna DC-I Coils, TC Fuse Block, Barnett HD Clutch Springs, Superbike Handlebars, V-Star 650 ACCT, NGK Irridium Plugs, OEM Exhaust. CNC-Cut 2nd Gear Dogs; Ported/Milled Head; Modded Airbox: 8x8 Wix Panel Filter; #137.5 Main Jet, Viper Yellow Paint, Michelin Pilot Activ F/R, Interstate AGM Battery, 14MM MC, Maier Fairing, Cree LED Fog Lights.

            Comment

            • #7
              Being an engineer, its in my nature to read and follow the book. That and I have stripped out to many things over tightening stuff. Worse yet. Have it rattle loose and fall off. If it broke from applying the specified torque, it would probably break under the forces of its use as well.
              Life is what happens while your planning everything else!

              When your work speaks for itself, don't interrupt.

              81 XS1100 Special - Humpty Dumpty
              80 XS1100 Special - Project Resurrection


              Previously owned
              93 GSX600F
              80 XS1100 Special - Ruby
              81 XS1100 Special
              81 CB750 C
              80 CB750 C
              78 XS750

              Comment

              • #8
                Originally posted by DGXSER View Post
                Being an engineer, its in my nature to read and follow the book. That and I have stripped out to many things over tightening stuff. Worse yet. Have it rattle loose and fall off. If it broke from applying the specified torque, it would probably break under the forces of its use as well.
                X2 and I like to hear the "Click"
                1980 XS1100G "Dolly G" Full Dresser (with a coat of many colors )
                1979 XS1100SF (stock-euro mods planned)
                1984 XV700L Virago (to be hot-modded)
                1983 XJ750MK Midnight Maxim (semi-restored DD)
                1977 XS650D ( patiently awaiting resto)

                Sometimes it takes a whole tank of gas before you can think straight.

                Comment

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