Stripped engine sprocket nut

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  • Guest
    #1

    Stripped engine sprocket nut

    I was taking the chain off for maintenance and it got stuck. So I pulled the engine sprocket cover off and found the engine sprocket nut just laying in the cover. After cleaning it up I discover there are no thread left in the nut!

    Anyone know how that could happen?
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    • Guest
      #2
      Originally posted by goggles
      I was taking the chain off for maintenance and it got stuck. So I pulled the engine sprocket cover off and found the engine sprocket nut just laying in the cover. After cleaning it up I discover there are no thread left in the nut!

      Anyone know how that could happen?
      If you're not the original owner and haven't changed the sprocket before, I'd venture to guess that a PO stripped the threads with an impact gun. I doubt it's as hard as the shaft threads.

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        • Guest
          #3
          I changed the sprocket in 2010. I thought I did it correctly but who knows. I do know I did not use an impact wrench since I do not own one.

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            • Guest
              #4
              Is overtightening the only way the threads would strip out?

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                • Guest
                  #5
                  I don't know, this is the first time I've heard of this.

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                    • Guest
                      #6
                      Several others questions come to mind in replacing the sprocket.

                      The front sprocket is definitely worn.

                      sprockethighlight.jpg

                      I read that you should change the chain and rear sprocket as a set.

                      If the chain is not stretched beyond the specification in the manual , is it really necessary to change the chain?

                      Do you change the sprockets on a schedule or on the basis of wear?

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                        • RichDesmond
                          Forum Sage
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                          • Jul 2011
                          • 2757
                          • NoVa
                          #7
                          Originally posted by goggles
                          ...
                          I read that you should change the chain and rear sprocket as a set.

                          If the chain is not stretched beyond the specification in the manual , is it really necessary to change the chain?...
                          Yes. A worn chain will wear out the sprockets much faster.
                          '20 Ducati Multistrada 1260S, '93 Ducati 750SS, '01 SV650S, '07 DL650, '01 DR-Z400S, '80 GS1000S, '85 RZ350

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                            • cowboyup3371
                              Forum LongTimer
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                              • Apr 2010
                              • 13996
                              • In Ohio Now
                              #8
                              Change the chain and both sprockets at the same time not just the rear
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                                • bwringer
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                                  #9
                                  Originally posted by goggles
                                  If the chain is not stretched beyond the specification in the manual , is it really necessary to change the chain?
                                  Yes. Change the sprockets and chain as a set.


                                  The chain measurement procedure in the manuals is 100% complete unadulterated bull puckey.

                                  Maybe it had some validity back in the roller chain days in the 1960s or something, but modern x-ring/o-ring chains simply don't wear out that way.


                                  Back to the original topic, are the threads on the countershaft OK?
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                                    • Guest
                                      #10
                                      They show some wear. Hope there is enough to hold a replacement nut.

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                                        • Fjbj40
                                          Forum Sage
                                          • Oct 2012
                                          • 1221
                                          • Dartmouth Nova Scotia
                                          #11
                                          Lock-tite is your friend!
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                                            • RichDesmond
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                                              • Jul 2011
                                              • 2757
                                              • NoVa
                                              #12
                                              If the threads are damaged get a thread file and clean them up. Don't just spin a new nut onto damaged threads.
                                              '20 Ducati Multistrada 1260S, '93 Ducati 750SS, '01 SV650S, '07 DL650, '01 DR-Z400S, '80 GS1000S, '85 RZ350

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                                                • Guest
                                                  #13
                                                  Originally posted by RichDesmond
                                                  If the threads are damaged get a thread file and clean them up. Don't just spin a new nut onto damaged threads.
                                                  That is what I normally do.

                                                    Comment

                                                    • Guest
                                                      #14
                                                      Does anyone know the thread pitch for the threads?

                                                        Comment

                                                        • Guest
                                                          #15
                                                          I picked up a thread gauge at Lowes. The thread pitch is 1.5. I measured the inside diameter of the new nut and got 18.5 mm. I assume that means 18 mm nominal bolt size.

                                                          Also was wondering if the thread file or a die would be the better choice? Currently I have neither in my tools.

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