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    cam chain scoring cam cover

    So I did valve clearances and noticed scoring inside the cam cover from the cam chain on both sides (see pic). I can only assume that the tensioner was not working properly at some point and the chain was loose enough on the sprockets to make contact with the cover.

    What I know: the PO told me when reviving the bike, it "made a racket". Someone told him to give the chain tensioner a couple whacks with a hammer to loosen it up (ugh). But it evidently worked and the "racket" was gone.

    Any tips for making sure this is not still occurring? Is there something I can coat these grooves with, that will stay put enough (ie, with oil flying around) for me to remove the cover after running and see if the chain is making contact?
    Thanks everyone.
    IMG_2117.jpg
    1978 GS 750 E
    1979 XS11 Standard
    1973 CB450

    #2
    I'd put the engine on 1-4 T (TDC) and remove the cam chain tensioner. Then take it apart, replace the seals, and make sure everything is working smoothly. Even if the tensioner is working smoothly now, at some point it wasn't so a refresh can't hurt.
    Ed

    To measure is to know.

    Mikuni O-ring Kits For Sale...https://www.thegsresources.com/_foru...ts#post1703182

    Top Newbie Mistakes thread...http://www.thegsresources.com/_forum...d.php?t=171846

    Carb rebuild tutorial...https://gsarchive.bwringer.com/mtsac...d_Tutorial.pdf

    KZ750E Rebuild Thread...http://www.thegsresources.com/_forum...0-Resurrection

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      #3
      Thanks. I did take it out and grease the pushrod--could not get the lock shaft assembly to loosen, even with it in a vise and appling significant force--I read bwringer's rebuild tutorial, and that said to be wary of forcing it too hard, and leave it alone if it wouldn't budge. So I didn't get to fully refresh it.
      1978 GS 750 E
      1979 XS11 Standard
      1973 CB450

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        #4
        Go eBaying ...plenty available under $20 ..this item looks clean and salvageable

        1981 gs650L

        "We are all born ignorant, but you have to work hard to stay stupid" Ben Franklin

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          #5
          Thanks everyone, for all the help for a newbie. This forum is the best!
          1978 GS 750 E
          1979 XS11 Standard
          1973 CB450

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            #6
            Above all, make sure you install the tensioner properly. The instructions call for retracting the pushrod and locking it in place, then installing the tensioner. After it is installed, release the pushrod. After the pushrod is released, turn the setscrew in until it touches, then back it out 1/4 to 1/2 turn and lock it in place. That will allow the pushrod to move and do its job. Too many times, the "back it out 1/4 to 1/2 turn" part is not done.

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