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    cam lobe scratches

    camlobe2.jpg

    #3 exhaust cam lobe is scratched. There is signs of scratching on the shim as well. The scratch on the side of the lobe fingernail will actually stop in. Thoughts ?

    #2
    Don't worry about it. There's still plenty of rubbing area. Flip the shim to present a fresh good face to the cam and screw it back together.

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      #3
      Probably from someone not using the right tool on the shims. It should polish itself smooth again

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        #4
        One more question - I have seen a couple of notes about installing the half moon rubber oil seals on the ends of the cam backwards to "help reduce" cam walk. Is there any merits to this ? And if you do, what prevents the notches on the end of the cams from shredding the rubber and having rubber bits in your valve train area. Thanks

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          #5
          Originally posted by BillH View Post
          One more question - I have seen a couple of notes about installing the half moon rubber oil seals on the ends of the cam backwards to "help reduce" cam walk. Is there any merits to this ? And if you do, what prevents the notches on the end of the cams from shredding the rubber and having rubber bits in your valve train area. Thanks

          I have cam walk on my '82 and had it on my '82 850, it was occasional and I just ignored it.
          Its harmless and it grew on me. Which means it sucks but I got used to it.
          I liked the lip of the half moons inside to help keep from leaking and to keep from coming out but I never figured out what keeps them from going in
          Alan

          sigpic
          Weaned on a '74 450 Honda
          Graduated to an '82 GS850GL
          Now riding an '83 GS1100GL
          Added an '82 GS1100GL

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            #6
            Thanks Alan
            I had what was cam walk noise as well. Last year it was intermittent but this year it has gotten worse. It is all the time now, cold engine, hot engine, leaning, parking it on center stand doesn't matter and it's pretty loud. Yes it goes away after 2K rpm. So my thinking was to try some of the less expensive things a couple of folks had mentioned, like shim buckets, and turning the rubber end caps backward. I have seen the paper on the machining the head and half moon spacers to remedy the cam walk. I would have to take it somewhere for that to be done. Not sure if all the work I'm doing will help but I did want to try. Learning experience anyway.

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              #7
              Oh yeah, if it were constant on mine that would bug me.
              Alan

              sigpic
              Weaned on a '74 450 Honda
              Graduated to an '82 GS850GL
              Now riding an '83 GS1100GL
              Added an '82 GS1100GL

              Comment


                #8
                Originally posted by BillH View Post
                One more question - I have seen a couple of notes about installing the half moon rubber oil seals on the ends of the cam backwards to "help reduce" cam walk. Is there any merits to this ? And if you do, what prevents the notches on the end of the cams from shredding the rubber and having rubber bits in your valve train area. Thanks
                Boy, I'd really like to hear from some people that have tried this. I've shied away from doing it because I'm worried about rubber bits too.

                1983 GS750ED-Horsetraded for the Ironhead
                1981 HD XLH

                Drew's 850 L Restoration

                Drew's 83 750E Project

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                  #9
                  The manufacturing tolerances are loose enough that the half moons may or may not fit in backwards. On one side of my head, they won't go in backwards. I don't do this for the cam walk though. Intuitively, it seems less likely to leak.

                  Edit: Oh yes, the cam lobe. You'll notice the scratches are in an area where you can still see the original grind on the cam. It still has clearance on that part of the cam. So, the scratches won't hurt just make sure there's no raised material or a burr ready to fall off.
                  Last edited by Dogma; 06-05-2017, 10:24 PM.
                  Dogma
                  --
                  O LORD, be gracious to me; heal me, for I have sinned against you! - David

                  Skeptical scrutiny is the means, in both science and religion, by which deep insights can be winnowed from deep nonsense. - Carl Sagan

                  --
                  '80 GS850 GLT
                  '80 GS1000 GT
                  '01 ZRX1200R

                  How to get a "What's New" feed without the Vortex, and without permanently quitting the Vortex

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                    #10
                    Update - so I have everything back together and have started it. The knocking noise is gone, well at least for now. YAH !! I think the carbs need tweaking again. So maybe all those little things helped. I hope to ride to ride it some this coming week.

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