broke exhaust manifold bolts

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  • Howell4706
    XSive
    • Mar 2012
    • 30
    • Stillwater, OK.

    #1

    broke exhaust manifold bolts

    so one of my exhaust pipes falls off yesterday. yeah i know.

    the two heads of the bolts have broke off, looks like enough thread to do the double nut thing.

    anyone know what size nut i need to buy
  • crazy steve
    XS-XJ Guru MODERATOR
    • Jan 2009
    • 7932
    • Beautiful outer Yelm, WA

    #2
    8mm........
    Fast, Cheap, Reliable... Pick any two

    '78E original owner - resto project
    '78E ???? owner - Modder project FJ forks, 4-piston calipers F/R, 160/80-16 rear tire
    '82 XJ rebuild project
    '80SG restified, red SOLD
    '79F parts...
    '81H more parts...

    Other current bikes:
    '93 XL1200 Anniversary Sportster 85RWHP
    '86 XL883/1200 Chopper
    '82 XL1000 w/1450cc Buell, Baker 6-speed, in-progress project
    Cage: '13 Mustang GT/CS with a few 'custom' touches
    Yep, can't leave nuthin' alone...

    Comment

    • Howell4706
      XSive
      • Mar 2012
      • 30
      • Stillwater, OK.

      #3
      thanks

      thanks again

      Comment

      • WMarshy
        XS-XJ Guru
        • Apr 2009
        • 2402
        • Mexico NY

        #4
        Anyone know the torque spec for the exhaust studs/nuts..?
        '79 XS11 F
        Stock except K&N

        '79 XS11 SF
        Stock, no title.

        '84 Chevy K-10 "Big Blue"
        GM 350, Muncie SM465, NP208, GM 10 Bolt with 3.42gears turnin 31x10.5 Baja Claws

        "What they do have is an implacable, unrelenting presence and movement that bespeaks massive power lurking behind paint and chrome. They don't wail like a screeching ninja, the don't rumble like a harley. They just growl like a spactic, stressed out badger waiting to rip your face off and eat your soul." Trainzz~RIP~

        Comment

        • crazy steve
          XS-XJ Guru MODERATOR
          • Jan 2009
          • 7932
          • Beautiful outer Yelm, WA

          #5
          Originally posted by WMarshy
          Anyone know the torque spec for the exhaust studs/nuts..?
          14.5 ft-lbs....
          Fast, Cheap, Reliable... Pick any two

          '78E original owner - resto project
          '78E ???? owner - Modder project FJ forks, 4-piston calipers F/R, 160/80-16 rear tire
          '82 XJ rebuild project
          '80SG restified, red SOLD
          '79F parts...
          '81H more parts...

          Other current bikes:
          '93 XL1200 Anniversary Sportster 85RWHP
          '86 XL883/1200 Chopper
          '82 XL1000 w/1450cc Buell, Baker 6-speed, in-progress project
          Cage: '13 Mustang GT/CS with a few 'custom' touches
          Yep, can't leave nuthin' alone...

          Comment

          • mikubuilder
            XSive Maximus
            • Jul 2011
            • 548
            • Westland, Mich.

            #6
            Steve is like encyclopedia of XS knowledge
            Nick

            1979 XS11 F,Yamaha fairings w/hard bags, TC's fuse box, K&N air filter

            1982 Virago 750 (it's alive!)

            1979 XS 11 F, Windjammer IV, Samsonite luggage cases(another rescue)

            Comment

            • ManagerMike
              XStremely XSive
              • Mar 2010
              • 445
              • S.E. Michigan

              #7
              Originally posted by WMarshy
              Anyone know the torque spec for the exhaust studs/nuts..?
              Dehr German torque shpek; ghudentieght
              '78 E "Stormbringer"

              Purrs like a kitten, roars like a lion, runs like a gazelle (being chased by a cheetah).

              pics http://s1209.photobucket.com/albums/...tormbringer45/

              Comment

              • fredintoon
                Master of XSology
                • Mar 2004
                • 6795
                • Saskatoon SK

                #8
                Originally posted by Howell4706
                so one of my exhaust pipes falls off yesterday. yeah i know.
                the two heads of the bolts have broke off, looks like enough thread to do the double nut thing.
                anyone know what size nut i need to buy
                Hi Lance,
                like they said, M8.
                But wait! There's more!
                The pipes should be held on by studs and funny nuts that have a cylindrical outside and an Allen key socket in the end.
                What you got?
                Fred Hill, S'toon
                XS11SG with Spirit of America sidecar
                "The Flying Pumpkin"

                Comment

                • GLoweVA
                  XS-XJ Guru
                  • Jun 2011
                  • 1957
                  • Virginia Beach, VA.

                  #9
                  Fred is absolutly right:




                  Depending on year and model, you should either have the 8mm or 6mm hex.
                  In the pic the 6mm one is the new one.
                  Like Steve said, the threads are 8mm and they should be studs. Search the forum, recently someone here was looking for replacement studs (and/or some all thread stock)
                  Hi, my name is George & I'm a twisty addict!

                  80G (Green paint(PO idea))
                  The Green Monster
                  K&N A/F, TC's fuse block, '81 oil cooler, TC's homemade 4-2 w/Mac Mufflers, Raptor 660 ACCT
                  Got him in '04.
                  bald tire & borrowing parts

                  80SG (Black w/red emblems & calipers)
                  Scarlet
                  K&N A/F, TC's fuse block, WJ5, Shoei bags, Raptor 660 ACCT.
                  Got her in '11
                  Ready for the twisties!

                  81H (previously CPMaynard's)
                  Hugo
                  Full Venturer, Indigo Blue with B/W painted tank.
                  Cold weather ride

                  Comment

                  • fredintoon
                    Master of XSology
                    • Mar 2004
                    • 6795
                    • Saskatoon SK

                    #10
                    Hi again Lance,
                    if you have a stock exhaust system it's held onto the head by adapters that have fins on them such that the only way to get at the nuts is end-on with an Allen key so those funny fasteners are the only way to go.
                    However, some aftermarket exhausts come with flat flanges that allow you to use normal nuts to hold the pipes on.
                    You can even use Allen head capscrews if you pull the studs but there's the risk of wearing out the tapped holes in the head if you swap the pipes out a lot.
                    Last edited by fredintoon; 07-26-2012, 11:27 AM.
                    Fred Hill, S'toon
                    XS11SG with Spirit of America sidecar
                    "The Flying Pumpkin"

                    Comment

                    • GLoweVA
                      XS-XJ Guru
                      • Jun 2011
                      • 1957
                      • Virginia Beach, VA.

                      #11
                      Yeah Fred, I forgot about the aftermarket headers. My SG has stock pipes with the 'finned' flanges and my G had a Mac 4-2 with the flat flanges. I've got the allen nuts on both and on my G they work just fine. Now my G has TC's homemade headers with flat flanges also and we reused the existing nuts.
                      I got my 6mm replacement nut from Boats.net for dirt cheap. (like $1.69 or something like that)
                      Last edited by GLoweVA; 07-26-2012, 12:03 PM.
                      Hi, my name is George & I'm a twisty addict!

                      80G (Green paint(PO idea))
                      The Green Monster
                      K&N A/F, TC's fuse block, '81 oil cooler, TC's homemade 4-2 w/Mac Mufflers, Raptor 660 ACCT
                      Got him in '04.
                      bald tire & borrowing parts

                      80SG (Black w/red emblems & calipers)
                      Scarlet
                      K&N A/F, TC's fuse block, WJ5, Shoei bags, Raptor 660 ACCT.
                      Got her in '11
                      Ready for the twisties!

                      81H (previously CPMaynard's)
                      Hugo
                      Full Venturer, Indigo Blue with B/W painted tank.
                      Cold weather ride

                      Comment

                      • Howell4706
                        XSive
                        • Mar 2012
                        • 30
                        • Stillwater, OK.

                        #12
                        Originally posted by fredintoon
                        Hi Lance,
                        like they said, M8.
                        But wait! There's more!
                        The pipes should be held on by studs and funny nuts that have a cylindrical outside and an Allen key socket in the end.
                        What you got?
                        Originally posted by GLoweVA
                        Fred is absolutly right:




                        Depending on year and model, you should either have the 8mm or 6mm hex.
                        In the pic the 6mm one is the new one.
                        Like Steve said, the threads are 8mm and they should be studs. Search the forum, recently someone here was looking for replacement studs (and/or some all thread stock)
                        so where do i buy those little nuts, my old ones probably fell off.

                        Comment

                        • Howell4706
                          XSive
                          • Mar 2012
                          • 30
                          • Stillwater, OK.

                          #13
                          and i would guess my exhaust flange is stock.

                          Comment

                          • GLoweVA
                            XS-XJ Guru
                            • Jun 2011
                            • 1957
                            • Virginia Beach, VA.

                            #14
                            It's a 6mm driver instead of the stock 8mm and only costs 1.49 from boats.net

                            http://www.boats.net/parts/detail/ya...-08599-00.html
                            Here's the link for when I bought mine.
                            Hi, my name is George & I'm a twisty addict!

                            80G (Green paint(PO idea))
                            The Green Monster
                            K&N A/F, TC's fuse block, '81 oil cooler, TC's homemade 4-2 w/Mac Mufflers, Raptor 660 ACCT
                            Got him in '04.
                            bald tire & borrowing parts

                            80SG (Black w/red emblems & calipers)
                            Scarlet
                            K&N A/F, TC's fuse block, WJ5, Shoei bags, Raptor 660 ACCT.
                            Got her in '11
                            Ready for the twisties!

                            81H (previously CPMaynard's)
                            Hugo
                            Full Venturer, Indigo Blue with B/W painted tank.
                            Cold weather ride

                            Comment

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